Shear Band Formation Research Articles

THREE-DIMENSIONAL STRAIN/STRESS FIELDS IN BERKOVICH/VICKERS INDENTATION: COMPARISONS WITH THIN FILM DELAMINATION AND SHEAR BAND FORMATION

Starting from the simple assumption that the displacement field underneath a pyramidal (Berkovich/Vickers) tip for very shallow indents is described by the Boussinesq solution, while for deeper ones is dictated by the tip's specific geometry, a combination of the two leads to a combined displacement field for the material at contact with the tip. Continuum mechanics is then utilized for the calculation of the strain tensor, while gradient elasticity theory is adopted for the determination of the stress tensor underneath the tip. Gradient elasticity was assumed in order for the gradient term to be able to model, in this case, the inhomogeneously applied load due to the specific tip geometry, which is different than a flat punch. The thus calculated stress component along the loading (vertical) direction is a parametric function of the material's elastic constants (Poisson's ratio, Lame constants), as well as of the maximum elastic deformation and the gradient coefficient. By appropriately modifying these parameters, the proposed formulation seems to be able to predict the mechanical response of the material underneath the indenter for the specific pyramidal tip geometry (Berkovich or Vickers), without any approximations or empirical relations. The validity of the proposed formulation's predictions was checked against thin film delamination and shear band formation AFM/SEM micrographs, which showed a very good qualitative as well as quantitative comparison with the theoretical predictions.

Modelling of progressive failure mechanism of mine pillars

Rock fracturing process around underground openings is mainly a process of progressive slabbing with the generation of surface-parallel fractures in the initial stage, and shear failure is likely to occur in the final process. The difficulty of capturing this behaviour through conventional continuum modelling has led to the development of advanced constitutive laws for use in continuum models. Recently, an enhanced continuum constitutive approach to simulate strain-softening based on the Hoek-Brown failure criterion has been presented. This advanced Hoek-Brown model with Softening introduces a hyperbolic decay of the material properties affecting the post-peak response and the nonlinear dilation, thus enabling to investigate failure modes in the form of dilatant shear bands. Moreover, to restore the objectivity of the numerical solution during the development of strain localization phenomena, a viscous regularization technique has been implemented within the model. The performance of this constitutive model has been proved and, in this paper, further numerical computations are reported concerning the brittle failure process occurring in mine pillars, thus confirming the capability to capture failure mechanisms during excavation within a strain localization regime.

Atomistic mechanisms underlying plastic flow at ultralow yield stress in ductile carbon aerogels.

We investigated carbon aerogel samples with super low densities of 0.013 g cm-3 (graphite is 2.5) and conducted compression experiments showing a very low yield stress of 5-8 kPa. To understand the atomistic mechanisms operating in these super low density aerogels, we present a computational study of the mechanical response of very low-density amorphous carbonaceous materials. We start from our previously derived atomistic models (based on the DynReaxMas method) with a density of 0.16 g cm-3 representing the core regions of carbon aerogels. We considered three different phases exhibiting either a fiber-like clump morphology interconnected with string-like units or a more reticulated framework. We subjected these phases to compression and shear deformations and analyzed the resulting plastic response via an inherent-structure protocol. Strikingly, we find that these materials possess shear plastic relaxation modes with extremely low values of yield stress, negligible with respect to the finite values predicted outside this "zero-stress" region. This is followed by a succession of two additional regimes with increasing yield stress values. Our analysis of the atomistic relaxation mechanisms finds that these modes have a collective and cooperative character, taking the form of nanoscopic shear bands within the clumps. These findings rationalize our experimental observations of very low-stress plastic deformation modes in carbon aerogels, providing the first steps for developing a predictive multi-scale modeling of the mechanical properties of aerogel materials.

Evaluating the solid solution, local chemical ordering, and precipitation strengthening contributions in multi-principal-element alloys

Numerous theoretical and experimental studies suggest that the chemical ordering microstructure plays an important role for the strength and plastic deformation in the multi-principal-element alloy (MPEA). Despite the importance of this fact has been well confirmed, little is known about the influence of chemical ordering degree from the atomic scale to nano scale for the nanocrystal MPEA over a wide grain size range. In the present work, considering the abnormal local stacking fault energy originated from the heterogeneous chemical element concentration, the modified Hall-Petch relationship is elaborately established in MPEA, quite different from the traditional alloys. Additionally, the effects of the solid solution, local chemical ordering, and precipitation on the strengthening contribution and strain partition are evaluated. The increase of the chemical ordering degree improves the stacking fault energy and deformation gradient, as well as microrotation field. This trend leads to the yield strength owing to the formation of the slender shear bands. The geometry of the ordered structure is deformed and twisted to a certain extent, for the compatible plastic deformation. This work gives the atomic understanding of chemical-ordering-degree dominated strengthening mechanisms, to develop the strong and ductile MPEAs with desired properties. Data availability statementThe data that support the findings of this study are available from the corresponding author upon reasonable request.

Discrete element analysis of sand-tyre chips mixtures with different tyre chip orientations under triaxial compression tests

Sand-tyre chips (STCh) mixtures are emerging civil engineering materials that have been widely studied and applied. In the sand-tyre chips system, the mechanical behavior of sand matrix is improved attributed to the excellent property of tyres. However, the effect of tyre chip orientation for STCh mixtures is not fully appreciated, especially from the microscopic scale. In this paper, the microscopic behaviors of STCh mixtures with different orientation tyre chips were investigated employing the Discrete Element Method (DEM). The tyre chips model was constructed with sufficient consideration and the microscopic parameters of STCh model were confirmed by the calibration procedure. Simulation results illustrate that horizontal tyre chips more effectively enhance the mechanical properties of mixtures. The visualization of the specimen shows that the orientation of tyre chips can influence the evolution of system contact network, formation of shear band, and bulging deformation of specimen. The microscopic mechanism including the composition of strong contacts, coordination number, average normal contact force, sliding and rolling, energy storage and dissipation, and the tensile force in tyre chips were studied to evaluate the discrepancies of different orientation tyre chips. The mechanism of the reinforcement for tyre chips can receive further understanding from this study.

Grain size dependent mechanical behavior and TRIP effect in a metastable austenitic stainless steel

The change in the trends of mechanical behavior and martensite formation of austenitic steels versus grain size has not yet been explained for the coarse-grained regime. Moreover, the effect of grain size needs systematic investigation by considering a wide range of grain sizes from the ultrafine-grained (UFG) regime to the coarse-grained one. In response, the effect of a wide range of austenite average grain sizes from 0.5 to 192 µm on the mechanical behavior and transformation-induced plasticity (TRIP) effect in an AISI 304L stainless steel was systematically investigated in the present work. Analysis of the tensile properties revealed that there is a transition grain size range of 34 to 90 µm, where a meaningful change in the trends of the ultimate tensile strength (UTS), total elongation, tensile toughness, work-hardening capacity, and yield ratio was observed. For instance, the total elongation increased with increasing average grain size up to the transition range but decreased at coarser grain sizes. However, the yield stress followed the Hall-Petch relationship of YS(MPa)=134.2+632.6/D(μm) for the whole grain size range, indicating that the presence of the transition grain size range is related to the work-hardening behavior, especially the TRIP effect. The apparent stacking fault energy decreased with increasing the grain size and reached a plateau after the transition grain size range. The same trends were found for the critical strain for the onset of the TRIP effect. Moreover, increasing the grain size up to this transition range promoted the formation of deformation-induced martensite, which was followed by its suppression at coarser grain sizes. The same trends were found for the maximum work-hardening rate related to the TRIP effect. The evolution of mechanical properties and TRIP effect with the grain size up to the transition range was explained based on the dependency of apparent stacking fault energy on the grain size. However, with the constancy of apparent stacking fault energy at coarser grain sizes, the decline in the formation of shear band intersections was found to play a significant role. The latter effect was further supported by Olson-Cohen analysis and investigation of the grain size dependency of the rate of shear-band formation (α) and the probability of generation of the martensite embryo at shear-band intersections (β).

Insight on bulk shear strength parameters of clay using discrete element approach incorporating physics-based interparticle force model

This paper aims to provide insight on factors affecting the bulk shear strength parameters of clay, i.e., the cohesion and internal friction as well as the effects of memory of preconsolidation pressure. A unique Discrete Element Method (DEM) model is built on platy particles with customized particle interaction force model. The particle interaction force model considers non-contact forces (such as the long-range electrostatic repulsion, short-range van der Waals attraction) as well as the direct contact force. The long-range electrostatic forces are calibrated by measurement with Atomic Force Microscope (AFM). Parameters for direct particle contacts of the regular DEM contact model, such as the contact stiffness and the friction coefficient, are calibrated by use of experimental consolidation and direct shear testing data. Computational simulations are conducted on digital clay specimen subjected to virtual direct shear tests. The predicted experimental responses of the digital specimens are consistent with typically observed in experiments including the shear stress-shear strain relationship, volumetric contraction and dilation, shear band formation, etc. From the stress–strain curves, the soil strength parameters are obtained with common experimental criteria. The DEM simulation results show that higher preconsolidation pressure drives more particles to overcome non-contact force into direct contacts and consequently bonding by van der Waals force. Consequently, the bulk cohesion of clay increases with increasing preconsolidation pressure. The results show that bulk cohesion strength is mainly attributed to the attractive interparticle force as well as the interlocking of platy particle, while the bulk internal friction angle is affected by the particle friction coefficient and particle fabric. Overall, the simulation results indicate the experimentally observed macroscopic shear strength parameters c and φ are linked to the microscope characteristics of soil particles and their mutual interactions. The results offer insight on the microscopic properties of particles on the bulk macroscopic strength behaviors. Besides, this work demonstrates a new strategy for simulation-based prediction of bulk soil strength parameters, by incorporating microscale characterization of the interparticle interactions and particle fabric into the particle-based DEM model.

Refinement mechanism of centimeter-grade coarse grains in as-cast Ti2AlNb-based alloy during multi-directional forging

Centimeter-grade coarse grains commonly exist in heavy ingots of Ti2AlNb-based alloy and severely deteriorate their workability. To investigate the refinement of coarse grains, multi-directional isothermal forging (MDIF) was carried out on samples cut from an ingot weighing about three tons. The results showed that the alloy can be refined by MDIF after 4 passes with 40% reduction per compression at 1200℃, while it cannot be refined even after 10 passes with 30% reduction per compression at 1200℃ or with 40% reduction per compression at 1050℃. The investigation showed that, as an intermetallics with low strain hardening rate, the material is very difficult to be refined by recrystallization if only increasing the total strain. The special refinement mechanism, i.e., grain thinning and shearing (GTS) induced recrystallization, is proposed. The reduction per compression is crucial to refine the coarse grains of this alloy. Coarse grains should be firstly squashed and thinned by large reduction, and then bent and bowed to form shear bands in the following perpendicular compressions. Coarse grains are truncated by repeated shearing, and the truncation increases interfaces within the coarse grains and contributes to the local misorientation accumulation, which in turn promotes the completion of recrystallization.

Microstructure evolution of adiabatic shear band in AZ31 alloy under dynamic compression

The formation of adiabatic shear band (ASB) and its damage behaviour in AZ31 alloy under high strain rate compression (2000 s−1) were investigated in this study by using a split Hopkinson pressure bar. Microstructure of the ASB was characterised by electron back-scattering diffraction and transmission electron microscopy, and the adiabatic shear damage behaviour was analysed through finite element simulation by LS-DYNA. The results show that the ASB and the surrounding microstructure form a gradient microstructure distribution, and the formation of ultra-fine grains in the ASB is due to rotational dynamic recrystallisation. The combination of work hardening and grain refinement in ASB leads to a high microhardness. Micro-voids grow in the ASB and eventually form macro-cracks, leading to material failure.

Effect of Elongation of a Rod on Strain Inhomogeneity and Shape Change During the Compression-Type Forming Process

Abstract The influence of elongation on the strain inhomogeneity and shape change in twinning-induced plasticity steel rod is systematically investigated to understand the macroscopic shear band (MSB) formation mechanism and to decrease the strain inhomogeneity during the compression-type forming processes. Specimens fabricated by rod flat rolling with elongation (3D rod) and by plane compression without elongation (2D rod) are compared using both finite element analysis and experiment. Despite the similar final product shape, the 2D rod presents a lower effective strain at the surface region than the 3D rod, leading to a high strain inhomogeneity. The higher effective strain at the surface region of the 3D rod is mainly attributed to the elongation of the 3D rod during the rolling. In contrast, the 2D rod exhibits strong dead metal zones owing to the lack of elongation of the specimen. Therefore, the formation of MSBs or strain inhomogeneity of a specimen can be reduced by increasing the elongation of the specimens during the forming process. Both the contact width and lateral spread of the 3D rod are lower than those of the 2D rod because of the elongation of the 3D rod originating from the slip effect at the rod–roll interface during the rolling process. The small frictional effect at the rod and roll interface increased the elongation of the rod, leading to a decrease in the strain inhomogeneity and lateral spreading in the 3D rod.

Morphological Effects of Strain Localization in the Elastic Region of Magnetorheological Elastomers.

Strain localization is a significant issue that poses interesting research challenges in viscoelastic materials because it is difficult to accurately predict the damage evolution behavior. Over time, the damage mechanism in the amorphous structure of viscoelastic materials leads to subsequent localization into a shear band, gradually jeopardizing the materials' elastic sustainability. The primary goal of this study is to further understand the morphological effects and the role of shear bands in viscoelastic materials precipitated by strain localization. The current study aims to consolidate the various failure mechanisms of a sample and its geometry (surface-to-volume ratio) used in torsional testing, as well as to understand their effects on stress relaxation durability performance. A torsional shear load stress relaxation durability test was performed within the elastic region on an isotropic viscoelastic sample made of silicon rubber and a 70% weight fraction of micron-sized carbonyl iron particles. Degradation was caused by a shear band of localized plasticity that developed microscopically due to stress relaxation durability. The failure pattern deteriorated as the surface-to-volume ratio decreased. A field-emission scanning electron microscope (FESEM) and a tapping-mode atomic force microscope (AFM) were used for further observation and investigation of the sample. After at least 7500 cycles of continuous shearing, the elastic sustainability of the viscoelastic materials microstructurally degraded, as indicated by a decline in stress performance over time. Factors influencing the formation of shear bands were observed in postmortem, which was affected by simple micromanipulation of the sample geometry, making it applicable for practical implementation to accommodate any desired performance and micromechanical design applications.

Deformation behaviors of a model metallic glass under 3-D nanoindentation studied in molecular dynamics simulation

In recent years, molecular dynamics (MD) simulation has been used to study the deformation behaviors of glass under nanoindentation, mainly using ideal geometries like a spherical indenter or a 2.5-D sample geometry to simplify post-analysis and save computational costs. To generate stress/strain fields that can be directly compared with experiments, we developed a 3-D nanoindentation protocol in this work to study the deformation behaviors of a model metallic glass under sharp contact loading in MD. Our studies show that the indenter sharpness controls the shear band formation, and the interaction between shear bands dictates the crack initiation in the model metallic glass. Shear bands and residual stress fields in the model metallic glass from our simulated nanoindentation tests are consistent with observations in soda-lime silicate (SLS) glass from the instrumented indentation in experiments, as both of them favor shear deformation under sharp contact loading.

Crystallographic aspect of shear bands formation in pure iron deformed at high strain rates

In this paper results on shear bands developed in pure iron are presented. The main focus was put on microstructural characterization and crystal lattice rotation in sheared regions. The hat-shaped samples were deformed at a high strain rate of 560 s−1 using a drop-hammer. The microstructure of deformed specimen was investigated by optical microscopy and scanning electron microscopy equipped with a high-resolution electron backscattered diffraction facility. The changes of mechanical properties in the band area and neighbouring matrix were investigated using nano-indentation test. This paper clearly shows that initial stages of shear bands formation are associated with the formation of kink-type bands. The orientation maps revealed the crystallographic determination of the shear band formation. During deformation in each grain located within the sheared region, one of the {110}-type planes situate along the macro-shear band plane and <111> direction situates along the shear direction. In consequence, the formation of specific texture components within the shear band region was observed, different from texture observed in deformed matrix. In micro-scale no effects of dynamic recrystallization were observed. Nano-hardness tests indicated that notable increase of strain hardening is related to the strain localization in narrow shear band’ regions, while the matrix undergoes almost no deformation.

Dynamic compression deformation behavior of laser directed energy deposited α + β duplex titanium alloy with basket-weave morphology

Duplex titanium alloy with basket-weave morphology made by laser directed energy deposition (LDED) technique, has a bright application prospect in the armor protection field attributed to its excellent specific strength and bulletproof performance. In this research, the dynamic compressive deformation mechanisms of LDEDed TC11 titanium alloy under a strain rate of 3000/s are systematically investigated by investigating the dislocation slipping and twinning behavior. Meanwhile, this work gives explanations of the microstructure evolution of subsequent heterogeneous shear localization. The results indicate that TC11 alloy with basket-weave morphology possesses huge improvement in the average dynamic flow stress, uniform plastic strain, and impact absorption energy in contrast to that of titanium alloys with an equiaxed microstructure, which is known as the optimum prepared via traditional forming methods. The loading direction to α laths is largely responsible for slip modes manifestation under dynamic compression, which is illustrated in the unit triangle. When loading along < 0001 > at the vertex of the unit triangle, both basal slip and prismatic slip systems could not be motivated. When loading along directions within the unit triangle, either or both basal slip and prismatic slip systems could be activated, causing α lath twisting, rotation, or even refinement. Meanwhile, the Schmid factors reduction caused by α laths rotation results in the twinning, which will reduce the slip mean free path. During the heterogeneous shear localization, the adiabatic shear bands (ASB) formation finally leads to shear failure. The α laths within the transition zone in ASB are compressed to less than 200 nm in thickness. Ultrafine nanoscale equiaxed grains with few defects in the center zone of ASB are generated under dislocations pile-up and sub-grain rotation.

Effect of cutting speed on shear band formation and chip morphology of Ti–6Al–4V alloy using nanoindentation and EBSD mapping

The hardness and orientations of the primary α grains (αp) and the transformed β (βt) grains in segmented chips obtained by turning an as-received solution treated-and-aged bar of Ti–6Al–4V (wt.%) at cutting speeds of 1, 1.5 and 2 m/s (61, 91, and 122 m/min) were analyzed using nanoindentation mapping and electron backscattered diffraction (EBSD) maps. The hardness of each αp grain in the as-received Ti–6Al–4V bar highly depends on the crystal orientation, varying from 4.5 GPa to 6.7 GPa, and the hardness values of βt were about 20% lower. In the machined chips, αp grains showed hardness values similar to the as-received material while βt became slightly harder. The homogeneous shear strain within the segments (between shear bands) was estimated to be around 0.4–0.7 at all three cutting speeds. The width of the shear bands in the 1 and 1.5 m/s chips were ∼1.3 μm and ∼2 μm in the 2 m/s chips, which are 10–40% of thicknesses predicted by Molinari's isotropic continuum model, respectively. A smaller homogeneous shear strain was correlated with larger shear cracks at each cutting speed. Grain orientations favored by prism ⟨a⟩ slip in αp when cutting at 1 m/s made the localized shear band less “adiabatic” since both the shear stress and strain were lower when these orientations were dominant. In contrast, in orientations that favored pyramidal <c+a> slip, the αp grains experienced much higher shear stress and more localized shear strain when cutting at 2 m/s, leading to higher temperatures that were much more likely to induce the α to β phase transformation. A transformation to soft β phase during shearing accelerates plastic instabilities. These observations and comparisons with finite element simulations indicate that temperatures reached the α+β phase field locally, and higher cutting speeds led to more β phase that is detrimental to the tool life.

Microstructure Evolution and Mechanical Properties of Heterogeneous Nano/Ultrafine‐Grained Austenitic Stainless Steel Prepared by Low‐Temperature Rolling and Annealing

An 18Cr–8Ni austenitic stainless steel is subjected to cold rolling at room temperature and low temperature (−50 °C) under different amounts of deformation. The samples cold rolled to 70% deformation are then annealed to obtain nano/ultrafine‐grained steels with a good strength–ductility combination. The effects of cold rolling temperature and deformation amount on the microstructure evolution of austenitic stainless steel during rolling are investigated. The results reveal that low‐temperature rolling reduces the stacking fault energy of austenitic stainless steel and promotes the formation of shear bands, ε‐martensite, and α′‐martensite. For both low‐temperature and room‐temperature rolling, the austenite and α′‐martensite, austenite and ε‐martensite, α′‐martensite and ε‐martensite pairs follow the Kurdjumov–Sachs (K–S), Shoji–Nishiyama (S–N), and Burgers orientation relationships, respectively. The deformation‐induced martensite transformation sequence of austenitic stainless steel follows the processes γ → α' and γ → ε → α'. A heterogeneous nano/ultrafine‐grained structure with a grain size of 560 nm is obtained by low‐temperature rolling and annealing; room‐temperature rolling achieves a grain size of 690 nm. The heterogeneous nano/ultrafine‐grained steel exhibits a high yield strength of 908 MPa and maintains a satisfactory total elongation of 43%.

Finite-Disorder Critical Point in the Yielding Transition of Elastoplastic Models

Upon loading, amorphous solids can exhibit brittle yielding, with the abrupt formation of macroscopic shear bands leading to fracture, or ductile yielding, with a multitude of plastic events leading to homogeneous flow. It has been recently proposed, and subsequently questioned, that the two regimes are separated by a sharp critical point, as a function of some control parameter characterizing the intrinsic disorder strength and the degree of stability of the solid. In order to resolve this issue, we have performed extensive numerical simulations of athermally driven elastoplastic models with long-range and anisotropic realistic interaction kernels in two and three dimensions. Our results provide clear evidence for a finite-disorder critical point separating brittle and ductile yielding, and we provide an estimate of the critical exponents in 2D and 3D.

Effects of morphological gene decay and mutation on the micro–macro mechanical behaviours of granular soils

Particle morphology is multi-scale in nature. To investigate the effects of particle morphology at a specific length scale on the macro–micro mechanical behaviours of granular soils, morphological gene decay and mutation was incorporated into discrete-element method (DEM) simulations through spherical harmonic-based principal component analysis. All DEM samples were subjected to axial compression and constant confining stress. The macro-scale and grain-scale behaviours of the granular assembly were investigated. It was found that particle morphology shows significant effects on macro-scale behaviours including initial stiffness, peak stress ratio, volumetric contraction and dilation, and shear band formation, as well as grain-scale behaviours including coordination number, particle rotation and granular skeleton sustaining the major contact force chains. Among the different length scales, local roundness contributes the most to stress ratio, volumetric strain and particle coordination number, while general form contributes the most to shear strain, particle rotation and fabric structure. Another interesting finding was that the particle morphological effects are well reflected in the granular skeleton sustaining the major contact force chains, which is featured with a strong variation of the degree of particle shape irregularity among different kinds of gene-mutated samples.

Adiabatic Shear Banding in Nickel and Nickel-Based Superalloys: A Review

This review paper discusses the formation and propagation of adiabatic shear bands in nickel-based superalloys. The formation of adiabatic shear bands (ASBs) is a unique dynamic phenomenon that typically precedes catastrophic, unpredicted failure in many metals under impact or ballistic loading. ASBs are thin regions that undergo substantial plastic shear strain and material softening due to the thermo-mechanical instability induced by the competitive work hardening and thermal softening processes. Dynamic recrystallization of the material’s microstructure in the shear region can occur and encourages shear localization and the formation of ASBs. Phase transformations are also often seen in ASBs of ferrous metals due to the elevated temperatures reached in the narrow shear region. ASBs ultimately lead to the local degradation of material properties within a narrow band wherein micro-voids can more easily nucleate and grow compared to the surrounding material. As the micro-voids grow, they will eventually coalesce leading to crack formation and eventual fracture. For elevated temperature applications, such as in the aerospace industry, nickel-based superalloys are used due to their high strength. Understanding the formation conditions of ASBs in nickel-based superalloys is also beneficial in extending the life of machining tools. The main goal of the review is to identify the formation mechanisms of ASBs, the microstructural evolutions associated with ASBs in nickel-based alloys, and their consequent effect on material properties. Under a shear strain rate of 80,000 s−1, the critical shear strain at which an ASB forms is between 2.2 and 3.2 for aged Inconel 718 and 4.5 for solution-treated Inconel 718. Shear band widths are reported to range between 2 and 65 microns for nickel-based superalloys. The shear bands widths are narrower in samples that are aged compared to samples in the annealed or solution treated condition.

High strain rate deformation behavior, texture and microstructural evolution, characterization of adiabatic shear bands, and constitutive models in electron beam melted Ti-6Al-4V under dynamic compression loadings

The results of an investigation on the influence of strain rate on the microstructural and texture evolution, adiabatic shear band characterization, and deformation mechanism of electron beam melted Ti-6Al-4V vertically built cylindrical rods are presented and discussed in this paper. Typical initial microstructure includes a mixture of α (aluminum-rich) and β phases (vanadium-rich) and grain boundary α along with the columnar prior β-grain boundaries. High strain rate compressive loadings were applied using a Split-Hopkinson pressure bar at the strain rates of 700 s−1 and 1650 s−1 at room temperature. By increasing the strain rate from 700 s−1 to 1650 s−1, the maximum stress and total strain in the alloy increased by 510 MPa and 141%, respectively. The higher dislocation density in the more severely deformed sample led to a more considerable amount of dislocation cells and consequent subgrains, high-angle grains, and piled-up dislocations. Intense shear strain localization leading to the adiabatic shear bands formation that occurred at higher strain rates. Texture investigations of the ASB region proposed that α→β phase transformation occurred within the ASB. Flow behavior prediction and experimental data revealed reasonable accordance, using the Gao-Zhang-Yan and the Chang-Asaro model.