High Tensile Ductility Research Articles

Hot pack rolling of spark-plasma-sintered pre-alloyed powders to fabricate Ti2AlNb sheets

In this work, spark-plasma-sintered Ti-20.3Al-24.7Nb (at.-%) compact was pack rolled in different phase fields to fabricate Ti2AlNb sheets with high strength and ductility without post-heat treatment. The nano O phases in the B2 matrix contributed to the high tensile strength and ductility in a single B2 phase field. In the O + B2 phase field, the O phases remarkably increased in size and resulted in high tensile strength of 1407.1 MPa. Maintaining the O phases to nano sizes and cooperation with micro-sized α 2 phases resulted in extremely high elongation of 13.91% in the α 2+O + B2 phase field. The , , , and strengthening effects of the α 2 and O phases under different conditions were analysed in detail. Highlights Spark-plasma-sintered pre-alloyed powders are used as the raw compact before hot pack rolled Ti2AlNb sheet. Ti2AlNb sheets with good mechanical properties are obtained without any post-heat treatment. This ‘SPS pre-alloyed powder + hot pack rolling’ method has great potential in breaking the limit in sheet properties. The strengthening effects of different factors are analysed.

Deformation Twinning Induced High Tensile Ductility of a Gradient Nanograined Cu-Based Alloy.

We investigated the tensile properties of gradient nanograined Cu and CuAl samples prepared by plastic deformation. Tensile tests showed that the gradient nanograined Cu-4.5Al sample exhibits a uniform elongation of ~22% without any cracks, while the uniform elongation of the gradient nanograined Cu sample is only ~18%. Numerous mechanical twinning retards the softening of the nanograins and accommodates a high tensile ductility in the gradient nanograined Cu-4.5Al sample. This work indicates that mechanical twinning is a potential deformation mechanism to achieve high tensile ductility of nanograined materials.

Segmented Polyurethanes and Thermoplastic Elastomers from Elemental Sulfur with Enhanced Thermomechanical Properties and Flame Retardancy

AbstractThe production of elemental sulfur from petroleum refining has created a technological opportunity to increase the valorization of elemental sulfur by the creation of high‐performance sulfur based plastics with improved thermomechanical properties, elasticity and flame retardancy. We report on a synthetic polymerization methodology to prepare the first example of sulfur based segmented multi‐block polyurethanes (SPUs) and thermoplastic elastomers that incorporate an appreciable amount of sulfur into the final target material. This approach applied both the inverse vulcanization of S8 with olefinic alcohols and dynamic covalent polymerizations with dienes to prepare sulfur polyols and terpolyols that were used in polymerizations with aromatic diisocyanates and short chain diols. Using these methods, a new class of high molecular weight, soluble block copolymer polyurethanes were prepared as confirmed by Size Exclusion Chromatography, NMR spectroscopy, thermal analysis, and microscopic imaging. These sulfur‐based polyurethanes were readily solution processed into large area free standing films where both the tensile strength and elasticity of these materials were controlled by variation of the sulfur polyol composition. SPUs with both high tensile strength (13–24 MPa) and ductility (348 % strain at break) were prepared, along with SPU thermoplastic elastomers (578 % strain at break) which are comparable values to classical thermoplastic polyurethanes (TPUs). The incorporation of sulfur into these polyurethanes enhanced flame retardancy in comparison to classical TPUs, which points to the opportunity to impart new properties to polymeric materials as a consequence of using elemental sulfur.

Behaviour of fully encased composite columns under cyclic loads

AbstractConcrete and steel have different advantages, concrete has high compression strength and low cost while steel has high tensile strength, rigidity and ductility. Composite members have other beneficial qualities beside all of them. Composite columns are used extensively in modern buildings essentially in industrial buildings. The main purpose of this study is an analysis and a comparison between the responses (load‐displacements) of different types of composite columns under cyclic loads. For this purpose, a three‐dimensional (3D) finite element model is developed for the columns, the finite element analysis of composite columns is carried out by using ANSYS code. The numerical model considers the elasto‐plasticity of materials and the non‐linearity of contact friction. It is interesting to observe a large ductility of these composite elements and the efficiency of some types of the composite columns than others. The aim of the study is to analyze the encased composite columns under cyclic loads focused on the different type of steel section. The parameters studied are the influence of axial load levels, skeleton curve, ductility, energy dissipation and the peak lateral load also carried out. The results indicate that the first columns of the specimens have a low specimen energy dissipation due the durability of the columns is higher than the axial load applied, and for better ductility and energy dissipation the axial load level of fully encased composite columns should be limited to approximately a value of 0.6.

Behaviour of rectangular concrete filled tubular flange girders under combined loading

AbstractSteel‐concrete composite construction can provide an efficient structural solution by utilizing the two component materials to create a single effective composite section. The high tensile strength and ductility of steel combined with the excellent compressive strength and robustness of concrete results in an effective composite cross‐section which can be used in a wide variety of applications. There are a number of different shapes of composite beam, and this paper is focussed on a relatively new structural solution called concrete filled tubular flange girders (CFTFGs). These comprise a steel beam in which the top flange plate is replaced with a concrete‐filled hollow section. The compression flange can be any shape (e.g. circular, rectangular, and pentagonal) and the focus in the current paper is on simply supported girders with a rectangular section for the compression flange (i.e. RCFTFGs). These members have very high lateral torsional buckling resistance compared with conventional steel I‐girders of similar depth, width and steel weight and are therefore capable of carrying very heavy loads over long spans. However, they are complex to analyse and their behaviour is governed by several inter‐related parameters which are investigated and discussed herein. Given the most common applications of these girders, such as in bridges and carparks for example, they are frequently exposed to a simultaneous combination of high axial loads and bending moments. Although current design codes offer rules for the design of composite columns under combined loading, the design of RCFTFGs, which are asymmetric in nature under the combined effects of tension and bending, are not explicitly included. This work aims to investigate the ultimate strength of RCFTFGs with stiffened webs under the combined effects of various levels of axial tension and positive (sagging) bending moment. Nonlinear three‐dimensional finite element analyses using the ABAQUS computer software package have been developed to facilitate the study. The model is validated using available experimental data and then employed to conduct an extensive parametric study. It is shown that the moment capacity of RCFTFGs is reduced in most situations under the presence of an axial tensile force in the steel beam. In addition, the tensile capacity of the RCFTFGs is limited by the axial capacity of the steel beam alone, with little contribution from the concrete infill. Several influential parameters are examined and conclusions are discussed. Based on the finite element analysis, the moment–axial force interaction relationship is presented and discussed.

Correlation between microstructures and tensile deformation behavior of a PM near α Ti–6Al–2Sn–4Zr–2Mo−0.1Si alloy

A powder metallurgy (PM) near α Ti–6Al–2Sn–4Zr–2Mo−0.1Si (wt.%) alloy was fabricated by in-situ dehydrogenation and hot extrusion of a TiH2-based powder compact and heat treatments. Three types of microstructures were obtained in the as-consolidated state and after different heat treatments. They are a basketweave microstructure consisting of a network of inter-penetrating α plates filled with domains of ultrafine β transformed structure (βt) (Type I microstructure), an α/β lamellar microstructure with most β layers being thin and discontinuous plus α layers at prior β grain boundaries (Type II microstructure) and an α/βt lamellar microstructure (Type III microstructure). Although the three types of microstructures render the alloy with a similar yield strength (1085–1109 MPa) and ultimate tensile strength (1217–1239 MPa) due to the balanced effects of various strengthening mechanisms, the Type II microstructure exhibits a significantly lower tensile ductility than the other two types of microstructures (elongation to fracture: 5.5% vs. 13–14%). Examination of dislocations in the tensile deformed specimens reveals that dislocations cutting through the thin β layers in the Type II microstructure during deformation. Such interactions between moving dislocations and thin β layers in the Type II microstructure are expected to be the primary reason for the clearly lower strain hardening rate, premature fracture of grain boundary α layers and low tolerance to strain localization observed in the tensile tests, fracture surface examination and DIC analysis. This correlation between the microstructures and tensile deformation behavior strongly suggests that preventing moving dislocations cutting through thin β layers by turning them into thicker and ultrafine structure strengthened βt lamellae or blocks is critically important in ensuring high tensile ductility of high strength PM near α titanium alloys.

Shrinkage Mitigation of an Ultra-High Performance Concrete Submitted to Various Mixing and Curing Conditions.

Ultra-High Performance Concretes (UHPC) are cement-based materials with a very low water-to-binder ratio that present a very-high compressive strength, high tensile strength and ductility as well as excellent durability, making them very interesting for various civil engineering applications. However, one drawback of UHPC is their pretty high autogenous shrinkage stemming from their very low water-to-binder ratio. There are several options to reduce UHPC shrinkage, such as the use of fibers (steel fibers, polypropylene fibers, wollastonite microfibers), shrinkage-reducing admixtures (SRA), expansive admixtures (EA), saturated lightweight aggregates (SLWA) and superabsorbent polymers (SAP). Other factors related to curing conditions, such as humidity and temperature, also affect the shrinkage of UHPC. The aim of this paper is to investigate the impact of various SRA, different mixing and curing conditions (low to moderate mixing temperatures, moderate to high relative humidity and water immersion) as well as different curing starting times and durations on the shrinkage of UHPC. The major importance of the initial mixing and curing conditions has been clearly demonstrated. It was shown that the shrinkage of the UHPC was reduced by more than 20% at early-age and long-term when the fresh UHPC temperature was closer to 20 °C. In addition, curing by water immersion led to drastic reductions in shrinkage of up to 65% and 30% at early-age and long-term, respectively, in comparison to a 20% reduction for fog curing at early-age. Finally, utilization of a liquid polyol-based SRA allowed for reductions of 69% and 63% of early-age and long-term shrinkages, respectively, while a powder polyol-based SRA provided a decrease of 47% and 35%, respectively.

Ab Initio Modeling of fcc Fe-Co-Cr-Ni High Entropy Alloys with Full Composition Range

The Fe-Co-Cr-Ni quaternary system has been studied extensively in the past decade, not only because of the superior properties achieved like high tensile ductility and fracture toughness, but also it is the foundation for the development of FeCrCoNi-based HEAs. However, most of the investigations are mainly focusing on the equiatomic and semi-equiatomic compositions. The physical properties of non-equiatomic compositions are barely explored. In the current work, the ab initio approach is adopted to predict the lattice parameter, structure stabilities, elastic properties, and enthalpy of formations of fcc Fe-Cr-Co-Ni HEA single crystals with the special quasirandom structure (SQS) method. To expand the design of Fe-Co-Cr-Ni HEAs into a full composition range, the current simulations cover all the binaries, ternaries, and the whole quaternary system. The 2-D composition-property contour diagrams are created to show the physical properties in the ternary and quaternary systems. Our investigation shows that the fcc alloys' lattice parameter increases with the addition of Fe and Cr and decreases with Ni and Co. In addition to the enthalpy of formation at 0 K, the shape distortion rate is proposed to be another essential parameter to evaluate the crystal stability. The results show the addition of Cr would destabilize the fcc lattice and cause symmetry breaking. Finally, the result of Pugh’s ratio shows that most of the fcc alloys show ductile behavior (\(P\,\)> 1.75), especially for the alloys around Fe3Ni, FeCo, and Fe2NiCo (\(P\,\)> 2.5). The brittle behavior (\(P\,\)< 1.75) is located around Fe3Cr and Fe2CoCr. Meanwhile, Cr2NiCo and Cr2FeNiCo are considered promising compositions to be tried and verified experimentally because of the higher bulk modulus and moderate shear modulus.

Transformative high entropy alloy conquers the strength-ductility paradigm by massive interface strengthening

Recent metastable alloy designs have demonstrated simultaneous attainment of high ultimate tensile strength (UTS) and ductility in high entropy alloys but with low yield strength. Here we present new strategy for improving the work hardenability and yield strength (YS) together in Fe 38.5 Mn 20 Co 20 Cr 15 Si 5 Cu 1.5 high entropy alloy (Cu-HEA). Drastic increase in the YS (1.5 GPa) is attributed to the formation of γ/ε, ε/ε (twin type) and ε/ε (plate type) interfaces in the microstructure due to extreme grain refinement whereas high UTS-ductility synergy (2.2 GPa, 15%) is attained by dynamic Hall-Petch hardening across these interfaces (i.e. massive interface strengthening) and transformation induced plasticity in γ phase. Thus, this harmonious combination of YS and UTS-ductility synergy in Cu-HEA outperform all structural materials till date. Therefore, deformation-induced massive interface strengthening is a new, yet cost-effective pathway for synergizing the benefits of advanced steels and high entropy alloys together in a material by conventional processing route.

On the exceptionally high ductility of Mg–2Zn-0.3Ca-0.2Ce-0.1Mn alloy

A newly developed Mg–2Zn-0.3Ca-0.2Ce-0.1Mn (in weight %, ZXEM2000) wrought alloy exhibits an exceptionally high tensile ductility (29% ± 1.4% tensile elongation) along the rolling direction at room temperature. In this work, we investigated the fundamental plastic deformation mechanisms that can contribute to the high ductility of ZXEM2000. Scanning electron microscopy and transmission electron microscopy were carried out at selected strain levels to characterize the microstructural evolution. Compared with the deformed microstructures from the hot-rolled pure Mg and Mg–3Al–1Zn alloy at similar conditions, our results revealed that the high ductility of ZXEM2000 could be attributed to four key factors: weaker texture, fine grain size, reduced twinning, and increased cross-slip frequency of <c +a> dislocation. These direct observations offer a key insight into improving ductility of magnesium alloys for future alloy design and development.

In situ thermomechanical processing to avoid grain boundary precipitation and strength-ductility loss of age hardening alloys

To avoid grain boundary (GB) precipitation during aging, a new strategy of in situ thermomechanical processing for age hardening alloys was proposed. Specifically, high-density nanoscale precipitates were introduced into ultrafine grain (UFG) interiors of 7075Al alloy by equal-channel-angular (ECAP) processing at 250 °C for 8 passes, thus avoiding GB precipitation. Tensile test results indicated that the UFG 7075Al alloy exhibits superior mechanical properties (yield strength of 350 MPa, ultimate tensile strength of 500 MPa, uniform elongation of 18% and tensile ductility of 19%) compared with the UFG 1050Al counterpart (yield strength of 170 MPa, ultimate tensile strength of 180 MPa, uniform elongation of 2.5% and tensile ductility of 7%). Fracture surface morphology studies revealed numerous homogeneous micro shear bands in necking shrinkage areas of both UFG 7075Al and 1050Al alloys, which are controlled by cooperative GB sliding. Moreover, the introduction of nanoscale precipitates in UFG 7075Al matrix weakened the tendency of shear fracture, resulting in a higher tensile ductility and more homogeneous deformation. Different from the GB precipitation during postmortem aging, in situ thermomechanical treatment dynamically formed GBs after precipitation, thus avoiding precipitation on GBs.

Influence of Process Parameters on Mechanical and Corrosion Behavior of DED-Processed Biomedical Ti-35Nb-7Zr-5Ta Alloy

The laser-engineered net-shaping (LENSTM) process was employed for directed energy deposition (DED) of Ti-35Nb-7Zr-5Ta (wt.%) or TNZT, a low modulus metastable β-Ti alloy for biomedical applications. The laser power was varied in the range of 400–600 W, while keeping all other parameters constant. A change in the overall grain morphology was noted in the sample with an increase in the laser power. The higher laser power samples showed more columnar grains compared to the equiaxed grains observed in the 400-W condition. The DED-processed TNZT alloys exhibited a combination of high tensile yield strength (~ 500 MPa) and ductility (~ 25%). Moreover, the alloys also exhibited excellent corrosion resistance in Ringer’s solution. Overall, the results indicate that the LENS-deposited TNZT alloy could be a promising candidate for biomedical applications.

Microstructural evolution and strengthening mechanisms in CrxMnFeNi high-entropy alloy

Abstract In the present work, we reported the microstructure and mechanical properties of CrxMnFeNi high-entropy alloy (HEA). The microstructures of the HEAs were characterized by scanning electron microscopy (SEM) with electron back-scattered diffraction (EBSD) and energy dispersive spectrometer (EDS) system, X-ray diffraction (XRD), and transmission electron microscopy (TEM). Mechanical properties of the HEAs were measured by nano-indentation and tensile test. The results showed that the single face-centered cubic (FCC) structure was transformed into the FCC and body-centered cubic (BCC) dual-phase when the Cr content was higher than the threshold value. Also, in the dual-phase HEAs, the fraction of the BCC phase increased proportionally with the increasing Cr content. There was an excellent correlation between the phase composition and the corresponding concentration of the valence electron concentration (VEC). The single FCC phase structure alloy demonstrated lower yield strength and higher tensile ductility. In the dual-phase alloys, the presence of the BCC phase notably strengthened the alloy but deteriorated its ductility. The close relationship between the mechanical properties of the alloy and each phase and the effect of the FCC/BCC dual-phase were discussed. It was confirmed that the grain refinement and higher Hall–Petch strengthening coefficient caused by the BCC phase formation showed a good strength-ductility matching mechanism in the dual-phase alloys.

Evaluation of mechanical and microstructure properties of engineered cementitious composites made of zeolite

AbstractEngineered cementitious composite (ECC) is a type of cementitious product with high tensile strength and ductility. It exhibits high strain and multiple cracking behavior instead of deep and wide cracks due to tensile and bending loads. In this study, the efficiency, mechanical properties of different ECC mixtures containing different contents of zeolite were investigated. The zeolite to cement ratios of 1.2, 1.6, 2, and 2.4 were considered as corresponding zeolite replacement ratios. Results showed that the compressive strength of ECC mixtures attained 35 MPa at 28 days except for the mixture with Z/C ratio of 2.4, which is higher than that of the nominal compressive strength for normal concrete (30 MPa). Higher ductility was observed in mixtures with high contents of zeolite (Z/C of 2 and 2.4). It was found that despite lower strength and elastic modulus, replacement of higher zeolite showed significantly higher performance in post‐crack hardening strain behavior ECC mixtures. The microstructure studies confirmed that the addition of zeolite resulted in having a rough fiber surfaces and the end of fibers were delaminated cut off which led to tolerating higher frictional strain.

Lightweight Zr1.2V0.8NbTi Al high-entropy alloys with high tensile strength and ductility

High-entropy alloys (HEAs) provide a new perspective to design novel lightweight alloys, whereas the complex precipitates in current lightweight HEAs (LHEAs) generally limit the mechanical properties. By controlling Ti and Al, the B2 and C14 Laves precipitates in Zr 1.2 V 0.8 NbTi x Al y (Ti x Al y ) LHEA system were successfully suppressed, and a series of LHEAs with outstanding specific yield strength-ductility matching were designed. Especially, with the same deformability (tensile ductility over 25%), the specific yield strength of Ti3.6Al0.6 LHEA is over 40% higher than current developed HEAs. The excellent mechanical properties are attributed to be benefited by a combination of solid solution strengthening and chemical short-range order strengthening. Our results bring new insights into the phase stability and precipitation suppression of HEAs, which is constructive for the novel lightweight alloy development. • Ti–Al control achieved both precipitate suppression and lightweight in HEA design. • A specific strength improvement of 40% was achieved in HEAs with ductility over 25%. • Strengthening of solid solution and chemical short-range order benefit the property.

High strength-high ductility medium Mn steel obtained through CALPHAD based alloy design and thermomechanical processing

There is considerable research interest in developing medium Mn steels as part of the 3rd generation of advanced high strength steels, mainly due to the possibility to achieve high tensile strength-high ductility combination at an affordable cost. In the present work, we have designed a steel chemistry and its thermomechanical processing route based on a computational approach based on CALPHAD with an objective to achieve tensile strength and uniform elongation in excess of 1000 MPa and 20%, respectively. The influence of alloying elements on factors such as weldability, coatability and formability are also taken into account while designing the steel chemistries. The alloy chemistry was optimised to achieve at least 50% of retained austenite and a stacking fault energy in the range 12–20 mJ m −2 to activate transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) effects. The designed steel was cast and thermomechanically processed to produce ultrafine-grained ferrite and austenite microstructure with ~50% of retained austenite. Analysis of local composition by atom probe tomography revealed preferential partitioning of Mn and C to austenite during intercritical annealing, thereby enhancing its stability. The optimised microstructure resulted in tensile strength and uniform elongation in excess of 1300 MPa and 26%, respectively. The stress-strain curves revealed serrations and a staircase type of strain hardening. A detailed study of the strain hardening behaviour showed that this can be attributed to the occurrence of discontinuous TRIP effect and deformation twinning in the austenite. This was further corroborated by transmission electron microscopy of the deformed samples which showed the presence of nano-twins in the austenite phase while the XRD and EBSD of the deformed samples showed a significant drop in the austenite fraction post deformation.

In-vitro mechanical behavior and high cycle fatigue characteristics of NiTi-based shape memory alloy wire

Pseudoelastic NiTi-based shape-memory-alloy is a popular candidate for miniaturized biomedical components. Such material undergoes reversible stress-induced-phase-transformation resulting to significant recoverable-strain ~ 10%. In this study, the effect of corrosion, bio-fluids, fatigue mean-stress, stress-ratio and occurrence of functional-fatigue on the in-vitro performance of the NiTi system are carefully scrutinized. Systematic experiments are performed using specialized capstan-grip and customized bio-chamber in presence of relevant bio-fluids at human body-temperature. The alloy revealed excellent pseudoelastic plateau-strain along with a combination of optimally high ultimate tensile strength and ductility. Interesting insights developed from the study are beneficial for considering the biomedical usage of the alloy.

Microstructure, heat treatment and mechanical properties of TiB2/Al–7Si–Cu–Mg alloy fabricated by selective laser melting

Abstract Selective laser melting (SLM) of aluminium alloys is of research interest due to its potential benefits in fabricating complex components for aerospace and automotive industries. In order to improve the mechanical properties and demonstrate the credibility of selective laser melted (SLMed) Al alloys, the effects of post heat treatment on the microstructures and mechanical properties need to be studies. In the present work, the nano-TiB2 decorated Al–7Si–Cu–Mg samples were successfully fabricated using the SLM technique, and then post-treated by direct ageing and conventional T6 heat treatment. The as-built TiB2/Al–7Si–Cu–Mg sample exhibits fine equiaxed grain structures without preferred crystallographic texture due to the high cooling rate of SLM and the addition of nano-TiB2 particles. Nano-scale eutectic Si cells are present within the equiaxed grains. Inside the cells, there are dislocation tangles without precipitates. After direct ageing treatment, the grain and cell structures remain almost unchanged, and the new Al2Cu, Mg2Si, and Si phases are formed around the dislocations. While after T6 treatment, the fine grains grow up and the eutectic Si phases coarse leading to the broken of cell structures. Besides, the as-built TiB2/Al–7Si–Cu–Mg samples show high tensile strength and ductility (yield strength: 297.2 MPa, ultimate tensile strength: 474.6 MPa, elongation: 13.4%). During ageing, the yield strength is enhanced by ~35% due to precipitation hardening effect. While the broken of fine microstructure during T6 leads to the decrease of yield strength by ~16%. The microstructure development and preliminary strengthening mechanism were discussed. The effect of post-heat treatments can yield the SLMed TiB2/Al–7Si–Cu–Mg samples with appropriate mechanical properties, promoting a wide range of applications.

Tensile Performance of SHCC Road-Bridge Link Slabs in Fully Jointless Bridges

Deformation of the main girder is absorbed by a continuously reinforced concrete pavement (CRCP) with microcracks in fully jointless bridges. The conventional fully jointless bridge has been challenged by durability and reliability issues because the CRCP is vulnerable to crack and hard to control the crack width when it suffers temperature variation. In this paper, a new type of fully jointless bridge with the road-bridge link slabs using strain-hardening cementitious composite (SHCC) material is investigated. First, an experiment was carried out to study the material properties of SHCC material for a preliminary assessment of road-bridge link slab performance using this material. Results found that SHCC is adequate for link slabs for its high tensile ductility and fine cracks development. Second, an SHCC slab model tensile test was carried out to study the absorptive capacity and the crack distribution of the SHCC slab. Results verified the high absorptive deformation capacity of the SHCC slabs. When the longitudinal deformation reaches 10 mm, the surface cracks in the SHCC slab are fine and dense, the crack width is kept in 80 μm, and the internal force is small. Third, by comparing the tensile test results with a conventional CRCP slab with same length, it is found that an SHCC slab has higher absorption capacity, better crack distribution, and smaller internal force than a CRCP slab. Finally, through ABAQUS finite element modelling, the stress performance of SHCC road-bridge link slabs is simulated using a trilinear constitutive model. The calculated results are consistent with the experimental results.

Double toughening Ti-based bulk metallic glass composite with high toughness, strength and tensile ductility via phase engineering

The popular strategy of overcoming the brittle fracture of bulk metallic glasses (BMGs) is to develop BMG composites (BMGCs). Most BMGCs consist of a single crystalline phase and glassy phase, and they display enhanced plasticities. However, these BMGCs usually display a trade-off in strength, ductility and fracture toughness as most engineering structural materials, which severely hampers their industrial application. To obtain a pronounced combination in tensile strength, tensile ductility and fracture toughness, the multiphase reinforced dispersive Ti-based BMG composite was successfully prepared via phase engineering. The as-prepared BMGC consists of β-phase, α-phase and glassy phase. The composite manifested the tensile mechanical properties with the yield strength of ~ 1410 MPa, ultimate tensile strength of ~ 1625 MPa, and tensile ductility of ~ 3.6%, and fracture toughness of ~ 110 MPa∙m1/2. The outstanding tensile properties are attributed to the double toughening of α-phase and β-phase. The high fracture toughness is ascribed to that the coarser dual crystalline phases lead to the devious crack propagation and crack bridging. Our work highlights a novel route for developing high-performance BMGCs.