Dual-phase High-entropy Alloys Research Articles

Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power Systems

Dual-phase high entropy alloys have recently attracted widespread attention as advanced structural materials due to their unique microstructure, excellent mechanical properties, and corrosion resistance. However, their molten salt corrosion behavior has not been reported, which is critical in evaluating their application merit in the areas of concentrating solar power and nuclear energy. Here, the molten salt corrosion behavior of AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) was evaluated in molten NaCl-KCl-MgCl2 salt at 450 °C and 650 °C in comparison to conventional duplex stainless steel 2205 (DS2205). The EHEA showed a significantly lower corrosion rate of ~1 mm/year at 450 °C compared to ~8 mm/year for DS2205. Similarly, EHEA showed a lower corrosion rate of ~9 mm/year at 650 °C compared to ~20 mm/year for DS2205. There was selective dissolution of the body-centered cubic phase in both the alloys, B2 in AlCoCrFeNi2.1 and α-Ferrite in DS2205. This was attributed to micro-galvanic coupling between the two phases in each alloy that was measured in terms of Volta potential difference using a scanning kelvin probe. Additionally, the work function increased with increasing temperature for AlCoCrFeNi2.1, indicating that the FCC-L12 phase acted as a barrier against further oxidation and protected the underlying BCC-B2 phase with enrichment of noble elements in the protective surface layer.

Effect of Cryogenic Treatment on Microstructure and Mechanical Properties of Al0.6CrFe2Ni2 Dual-Phase High-Entropy Alloy

The contradiction between strength and ductility limits the application of high-entropy alloys (HEAs). To simultaneously improve the strength and ductility of HEAs, the cryogenic treatment was proposed and applied in this paper. The Al0.6CrFe2Ni2 HEA with dual-phase structure was selected as the experimental material for cryogenic treatment. The microstructure and mechanical properties of the HEA in an as-cast and cryogenically treated state were analyzed in detail. The results showed that the grain size of equiaxed crystal in the alloy decreased continuously by prolonging the cryogenic treatment time, and the average value was 44.6 μm for the cryogenically treated HEA at the time of 48 h, which was 46.5% lower than that of the as-cast alloy. The number and size of ordered body-centered cubic (B2) spherical nanophases embedded in the body-centered cubic (BCC) structured inter-dendritic region, however, increased continuously by extending the cryogenic treatment time. The cryogenic treatment also made more slip systems activate, cross-slip occurred in the alloy, and a large number of stacking faults were found in the transmission electron microscopy (TEM) microstructure for the alloy that underwent a long time in cryogenic treatment. The yield strength of the Al0.6CrFe2Ni2 HEA was gradually increased with the increase in cryogenic treatment time, and the maximum yield strength of the 48 h cryogenically treated alloy was 390 MPa, which was 39.3% higher than that of the as-cast. This increase in mechanical properties after cryogenic treatment was attributed to the refinement of grains and the large precipitation of nanophases, as well as the appearance of cross-slips and stacking faults caused by cryogenic treatment.

Dynamic mechanical properties, deformation and damage mechanisms of eutectic high-entropy alloy AlCoCrFeNi21 under plate impact

• Both L12 and B2 phases remain ordered at 12 GPa • The accurate Hugoniot equation of state of AlCoCrFeNi2.1 is obtained • Nanotwins are observed in L12 phase • Both ductile and brittle fracture modes are observed Shock compression and spallation of a eutectic high-entropy alloy (HEA) AlCoCrFeNi 2 . 1 with lamellar structure are investigated via plate impact loading with free-surface velocity measurements. The as-cast and postmortem samples are characterized with transmission electron microscopy, electron back-scatter diffraction and scanning electron microscopy. An accurate Hugoniot equation of state is determined. After shock compression to ∼ 12 GPa, both the L1 2 and B 2 phases retain their ordered structures. Dense dislocations in the {111} slip planes, stacking faults and deformation twins are found in the L1 2 phase, along with fewer dislocations in the {110} slip bands in the B 2 phase. Shock-induced deformation twinning within the L1 2 phase of this HEA is observed as a new deformation mechanism under various loading conditions. For spallation, both ductile and brittle damage modes are observed. The micro voids and cracks prefer to nucleate at the phase boundaries chiefly, then in the B 2 phase. Under similar shock stress, the spall strength of AlCoCrFeNi 2 . 1 HEA is about 40% higher than those of other reported dual-phase HEAs due to the high stability of its semi-coherent phase boundaries. Graphical Abstract .

A great enhancement of both strength and plasticity in a dual-phase high-entropy alloy by multi-effects of high carbon addition

High-entropy alloys (HEAs) have become an interesting research area for the novel alloying design paradigm. Interstitial carbon has usually been introduced to enhance mechanical properties of HEAs. To achieve addition of high carbon, this work designed a dual-phase Al10(FeNiCoMn)90 HEA without strong carbide-forming elements. The results showed that adding 3 at.% carbon did not cause the precipitation of carbides in this HEA, and its yield strength and plasticity increased by 237 MPa and 26.2 %, respectively, which was due to the increase of fcc phase fraction, the distribution change of bcc phase and interstitial strengthening. Addition of 4 at.% carbon only caused the precipitation of nano-scale carbides in the matrix and the yield strength and plasticity increased by 455 MPa and 5.5 %, respectively, resulted from phase modulation, interstitial strengthening and precipitation strengthening. Simultaneously, the transition from wavy slip to planar slip and the formation of microbands after carbon addition, which also led to an increase of plasticity. This work provides a promising method that if coarse carbides can be avoided, high carbon addition enhances both strength and plasticity in a dual-phase HEA by multi-effects including phase modulation, interstitial strengthening, precipitation strengthening and deformation mechanism transition.

Effect of Multi-Pass Friction Stir Processing on Microstructure and Mechanical Properties of a Metastable Dual-Phase High Entropy Alloy

Studies on Multi-pass Friction Stir Processing (FSP) of Fe49.5Mn30Co10Cr10C0.5, a metastable dual-phase High Entropy Alloy (HEA), were carried out with the aim to systematically investigate the microstructural changes occurring during different passes, and to evaluate the mechanical response of this alloy with progressive passes. A reduction in grain size and a change in HCP volume fraction was observed after each pass. Dynamic recrystallization, occurring during FSP, led to grain refinement, and the transformation induced plasticity (TRIP) effect resulted in observed changes in HCP phase fraction. One-pass FSPed material exhibits a higher work hardening rate and a higher ultimate tensile strength (UTS.) value, as compared to both, an annealed and two-pass FSPed material. This is due to a combination of two factors, a small grain size and a large fraction of metastable Face Centred Cubic (FCC) phase, in the microstructure of the one-pass material.

Effect of loading orientation on plasticity in nano-laminated CoNiCrFeMn dual-phase high-entropy alloy: a molecular dynamics study

Dual-phase high-entropy alloys (DP-HEAs) have been proved to be a kind of promising materials that exhibit a combination of excellent strength and ductility. Previous studies have emphasized the effect of interface and phase volume fraction on mechanical performance in DP-HEAs. However, the deformation mechanisms such as interplays between dislocations and the constituent phases have not been fully understood. Particularly, the research concerning plastic anisotropy in DP-HEAs is still lacking. Here, molecular dynamics simulations are performed to probe the effect of loading orientation on plasticity in the nano-laminated face-centered cubic (FCC)/hexagonal close-packed (HCP) CoNiCrFeMn DP-HEA. Results reveal that a switch from strengthening to softening and back to strengthening is closely related to the activation of different slip systems when tailoring the inclination angles of the nanolaminates with respect to the tensile direction from 0° to 90°. Slip transfer across phase boundaries, phase transformation and the nucleation of shear bands dominate the plasticity in the samples with low, medium and high inclination angles, respectively. Furthermore, the evolution of microstructures, such as dislocations, stacking faults, and FCC/HCP phase are analyzed to study the underlying deformation mechanisms. These results can help understand the plastic anisotropy of DP-HEAs and design alloys with excellent mechanical properties for engineering applications.

1D growth of Cr-rich nanophase induced by hydrogen in high-entropy alloy AlCoCrFeNi2.1

• Body-centered cubic phase in cast AlCoCrFeNi 2.1 contains lots of Cr-rich nanophases. • During the hydrogenation process, excess dislocations and vacancies are generated. • Dislocation pile-up and lattice misfit at the phase boundaries favor Cr-segregation. • Hydrogen-induced Cr-segregation near nanophase leads to its one-dimensional growth. One-dimensional (1D) growth of dense Cr-rich nanophase was found in the body-centered cubic (BCC) phase of the eutectic dual-phase high-entropy alloy (HEA) AlCoCrFeNi 2.1 after hydrogen charging (AHC). H atoms diffuse faster and deeper in the BCC, resulting in abundant vacancies and dislocations. The plentiful nanophase particles in the BCC phase before hydrogen charging (BHC) provide nucleation sites for its growth. Cr atoms diffuse faster under the complex interaction of dislocations, vacancies, and H atoms. Furthermore, the dislocations pinned by the nanophase lead to Cr atoms attached to the nanophase segregation. The 1D growth of nanophase shows two growth modes: island-chain fiber and habit-plane whisker.

Sc doping induced the mechanical property improvement of dual-phase high-entropy alloy

To tailor the generation and proportion of precipitated phase in high entropy alloys (HEAs) to achieve mechanical property improvement, Sc, known as a rare-earth element, is introduced into an equimolar AlCoCrFeNi HEA with a dual-phase structure. Hence, (AlCoCrFeNi)100-xScx HEAs (x = 0, 0.5, 1 and 2, at.%) are fabricated, and also the phases, microstructures, compressive behaviors and strengthening mechanisms are studied in detail. When introducing the Sc element, HEA microstructure evolves from a single BCC structure to a hypoeutectic structure. The hypoeutectic structure contains the primary BCC phase and eutectic region, in which the eutectic region is comprised of BCC phase and Laves phase. With an increase of Sc addition, the yield strength exhibits an improvement from ∼1293 to ∼1441 MPa due to solid solution strengthening and precipitated phase strengthening. However, the fracture strain decreases from 32.5% to 23.6%, and meanwhile compressive strength lowers from ∼2352 to ∼2018 MPa due to high stress/strain concentration stemming from the incompatibility of elastic and plastic deformation between precipitated eutectic phase and primary BCC phase. Moreover, the brittle fracture mechanism of the present alloy system is identified.

Synthesis of the AlCrCuMnNi high entropy alloy through mechanical alloying and spark plasma sintering and investigation of its wear behavior

In this research, AlCrCuMnNi high entropy alloy (HEA) was produced through mechanical alloying (MA) process and then was subjected to spark plasma sintering (SPS) process at different temperatures. The structural and microstructural properties of the alloy were examined after each process. The sample SPSed at 900 °C was then subjected to wear test at room temperature (RT) and 400 °C. The results of MA process were consistent with the thermodynamic analysis results as they revealed the formation a dual-phase HEA after 90 h of milling, which consisted of face-centered cubic and body-centered cubic phases. Increasing SPS temperature led to an increase in the hardness and density of the alloy due to the higher quality of sintering and formation of intermetallic compounds. Additionally, it was seen that the wear resistance of the AlCrCuMnNi HEA is higher at 400 °C compared to RT due to the formation of a hard oxide film on the sliding surface and reduction of the friction coefficient. Moreover, the wear mechanisms of the AlCrCuMnNi HEA at RT were delamination and adhesion which changed to abrasive wear and delamination at elevated temperatures.

Recrystallization Texture Analysis of FeCoNiCrMnAl0.5 High-Entropy Alloy Investigated by High-Energy X-ray Diffraction

In small volume fractions, the bcc phase plays an important role in the properties of FeCoNiCrMnAl0.5 multiple-phase high-entropy alloys (HEAs). Since the small volume fraction of the bcc phase limits the detection of its texture, its texture evolution during mechanical processing is still unclear. In the current research, high-energy X-ray diffraction was used to investigate the crystallographic textures of cold-rolled and annealed FeCoNiCrMnAl0.5 dual-phase HEA with fcc and bcc phases. During cold-rolling deformation, multi-pass symmetry under isothermal conditions leads to asymmetric {200}bcc and {211}bcc peaks; the asymmetry disappears after annealing treatment, with the evolution of prominent texture components and the release of internal residual stress. The Goss texture component and {112}<110> and {111}<112> texture components were intensified after cold-rolling in the fcc and bcc phases, respectively, with orientation relationships of {110}bcc<111>bcc//{111}fcc<110>fcc recognized in the cold-rolled HEA. Based on this relationship, the yield strength (YS) and engineering ultimate tensile strength (UTS) of the sample reached 570 MPa and 920 MPa, respectively, which shows a fracture elongation of 27%. The study provides deeper insight into the anisotropic mechanical characteristics of the investigated HEA and demonstrates the great potential of dual-phase HEAs for mechanical applications in industry.

Complex dynamic restoration processes leading to a high degree of deformability in a dual-phase Al0.5CoCrFeNi high entropy alloy

The current research provides scientific evidence based on experimental and modeling approaches that complex softening processes characterized by dynamic recovery (DRV) and dynamic recrystallization (DRX) combined with twinning contribute efficiently to the hot deformation processing of the Al 0.5 CoCrFeNi alloy. An as-cast face-centered-cubic (fcc) oriented Al 0.5 CoCrFeNi dual-phase high entropy alloy, HEA, was deformed in uniaxial compression to a true strain 0.8 at temperatures between 900 and 1100 ºC and strain rates from 0.0013 to 0.1 s −1 . A dynamic material model was applied to predict the processing windows, and the underlying deformation mechanisms were characterized using scanning electron microscopy and electron backscattered diffraction. The optimum processing window for the studied alloy is at 900–960 ºC/ 0.0013–0.002 s −1 , where the efficiency of power dissipation and strain rate sensitivity ranges from 45% to 50% and 0.28–0.33, respectively. The processing map also exhibits a domain of flow instability located in the lower temperature and higher strain rate regions, resulting mainly from flow localization. The studied alloy represents a dual-phase fcc + bcc/B2 microstructure in an as-cast (undeformed) state. The fcc matrix occupying 94 vol% forms dendrites with an average diameter of 210 µm, decorated by discrete networks of bcc/B2 phase of average grain size 3.5 µm residing in interdendritic regions. The microstructural analyses corroborate the coincidence of DRX and twinning in the fcc phase in all deformed specimens. However, only DRV takes place within the bcc phase. The current study reveals a well-suited parameter range to achieve a high degree of hot deformability in dual-phase HEAs by taking advantage of twinning combined DRX to refine the microstructure significantly. Future work will have to identify possible application cases. • The possibility of hot deformation processing of a duplex fcc+bcc Al 0.5 CoCrFeNi alloy. • Complex dynamic restoration processes lead to a high degree of hot workability. • The optimum processing window locates at 900–960 ºC/ 0.0013–0.002 s −1 . • Shear localization yields flow instability in lower temperature and higher strain rate regions.

Novel as-cast NiAlCoFeNb dual-phase high-entropy alloys with high hardness

• A novel class of NiAlCoFeNb HEAs were synthesized by vacuum arc melting. • These HEAs consist of NiAl-rich B2 phase and FeNb-rich hexagonal Laves phase. • The hardness increases with the incremental volume fraction of Laves phase. • The equiatomic Ni 20 Al 20 Co 20 Fe 20 Nb 20 HEA has ultrahigh hardness of ∼ 818 HV. The microstructure, phase constitution and microhardness of Ni 20 Al 20 Co 20 Fe 20 Nb 20 , Ni 25 Al 25 Co 20 Fe 20 Nb 10 and Ni 30 Al 30 Co 20 Fe 15 Nb 5 high-entropy alloys (HEAs) synthesized by vacuum arc melting have been investigated. These as-cast HEAs have a dual-phase structure including intermetallic NiAl-rich B2 phase and FeNb-rich hexagonal Laves phase, and the Nb increase leads to more fraction of Laves phase. Ultrahigh hardness of ∼ 818 HV was achieved in the equiatomic Ni 20 Al 20 Co 20 Fe 20 Nb 20 dual-phase HEA, which is consisted of 61.8 vol% Laves phase and 38.2 vol% B2 phase.

Effect of bias voltage on the structure and properties of CuNiTiNbCr dual-phase high entropy alloy films

The dual-phase structure has been proved to overcome the effect of strength-ductility trade-off of high-entropy alloys. However, most of the high entropy alloy films with larger atomic size difference tend to form a single amorphous structure under non-equilibrium deposition conditions such as magnetron sputtering. In this study, the dual-phase CuNiTiNbCr high entropy alloy film containing the Cu-rich FCC alloy phase and amorphous phase were synthesized by high-power pulsed magnetron sputtering at different bias voltages. The poor affinity of copper with other elements led to the segregation and enrichment of copper to form a Cu-rich FCC phase. The effects of substrate bias voltage on the microstructure, mechanical and corrosion properties of the films were investigated. With the increase of bias voltage, the content of copper in the film decreased, the stress state of the film changed significantly, and the compactness of the structure was improved. The hardness of all films was higher than that of most other high entropy alloy film systems. The films deposited under low bias voltage have better toughness. The film deposited at －50 V showed the best wear resistance due to a combination of high hardness and good toughness. The film deposited at －150 V showed the best corrosion resistance since it had the lowest self-corrosion current density (6.1 ×10−8 A/cm2), which was due to its compact structure and lower impurity content.

Insights on mechanical properties of dual-phase high entropy alloys via Y introduction

AlCoCrFeNi high entropy alloy (HEA) with a dual-phase A2+B2 structure has received significant research interests due to its favorable mechanical properties. In order to further optimize the mechanical properties of the dual-phase AlCoCrFeNi HEA, we design several types of (AlCoCrFeNi)100-xYx (x = 0, 0.05, 0.1, 0.5 and 1, at%) HEAs and explore the microstructure evolution as well as mechanical behaviors as a function of the Y addition. Adding Y element into the (AlCoCrFeNi)100-xYx HEAs tailors the phase composition, where Y-0.05 HEA is of the single BCC solid solution, similar to Y-0 HEA. And when Y addition is equal to or higher than 0.1 at%, (Ni, Y)-rich HCP phase is identified except for the BCC phase, coinciding with a δ-Ω phase selection model. Meanwhile, Y introduction can lighten the intragranular dendrite segregation. The volume fraction of HCP phase follows a growing trend from 0 vol% to 10.33 vol% with an increment of Y introduction, which is beneficial to enhancing the yield strength (from 1302 to 1447 MPa) and microhardness (from 517 to 597 HV). Furthermore, the fracture mechanism from a transgranular fracture mode to an intergranular fracture mode is also revealed.

Twinning damping interface design and synergistic internal friction behavior in FeMnCrCo high-entropy alloys

Vibration and noise reduction has always been important problem to be solved in the fields of rail transit, aerospace, marine engineering, and so on. In this paper, a novel Fe65-XMn20Cr15CoX (X = 5, 10, 15, 20) dual-phase high-entropy damping alloy with excellent properties were prepared by vacuum melting. The dependence of the alloy damping behavior on the twin interface, magnetic properties and phase interface was emphatically analysed. The effects of Co content on its microstructure, damping behavior and magnetic properties were investigated. The results show that with the increase of Co content, ε martensite gradually transforms to γ austenite, and the number of twins increases gradually. The peak damping (Q−1) increased from 0.0442 to 0.0595, an increase of 34.6%. The coupled effects of magneto-mechanical hysteresis, twin interface motion, and phase interface motion provide the alloy's excellent damping properties. The alloy has a higher damping internal friction peak of around 200 °C, which is due to the phase transition from ε to γ at the temperature. By adjusting the Co content, the phase content and twinning and other microstructures of the alloy can be regulated, and multiple damping mechanisms can be coupled to achieve higher damping performance.

Alterable tension-compression asymmetry in work hardening of an additively manufactured dual-phase high-entropy alloy

High-entropy alloys (HEAs) as potential structural materials appear to exhibit tension-compression asymmetry (TCA) in work hardening. However, the intricate origin of the TCA, particularly in multi-domain HEAs, remains unclear. Herein, an additive manufactured AlCoCrFeNi2.1 dual-phase (FCC + BCC) HEA was used as a prototypical model system to gain a fundamental understanding of the TCA in multi-domain HEAs. Microscopic characterizations demonstrate that the TCA in work hardening is primarily attributed to the dominant stacking fault (SF)-dislocation interaction, SF-SF interaction, and subordinate twin-dislocation interaction, all of which are observed only in the FCC phase in compression. The former two mechanisms not only offer strong strengthening by impeding dislocation motion, but also bring considerable plasticity. The latter mechanism occurs in the dense SF regions to accommodate the plastic deformation, and contribute to additional work hardening. However, in tension, there are only dislocations generated inside the FCC phase. The marked difference in the deformation of the FCC phase is closely related to the FCC/BCC alternating lamellar heterostructure. Dislocations will preferentially nucleate and accumulate at the phase boundary, resulting in localized stress concentration. In tension, the stress concentration will lead to rapid crack propagation parallel to the phase boundary, resulting in premature failure of the sample. In compression, various types of cracks are formed and develop slowly, postponing the failure of the sample. Also, this TCA has the potential to be tuned by tailoring the FCC/BCC lamellar heterostructure; specifically, the width ratio of the FCC phase to the BCC phase. Our findings deliver cutting-edge insights relative to the TCA in new forms of alloys and offer a promising strategy to achieve the tunable possibility of the TCA in the work hardening by designing hierarchical heterostructures.

Hydrogen-induced phase boundary Cr-segregation in high-entropy alloy AlCoCrFeNi2.1

We characterized the microstructure of the eutectic dual-phase high-entropy alloy AlCoCrFeNi2.1 after hydrogen charging and found that Cr-segregation appeared at the phase boundaries near the surface of the specimens. Further tests demonstrate that high hydrogen concentration results in larger strain and stress fields near the subsurface. During the hydrogenation process, abundant dislocations and vacancies are generated in the face-centered cubic (FCC) phase and move to the vicinity of phase boundaries. High interfacial energies and lattice misfit at the phase boundaries absorb some dislocations and vacancies resulting in nucleation and recrystallization of the Cr-rich phase. Subsequently, the Cr atoms in the FCC phase diffuse towards the phase boundary driven by the concentration gradient, and the Cr-segregation band forms and widens. Additionally, the width of the Cr-segregation band is limited due to the limitation of the diffusion coefficient and the accumulated width of lattice defects near the phase boundary.

Phase Volume Fraction-Dependent Strengthening in a Nano-Laminated Dual-Phase High-Entropy Alloy.

A recently synthesized FCC/HCP nano-laminated dual-phase (NLDP) CoCrFeMnNi high entropy alloy (HEA) exhibits excellent strength–ductility synergy. However, the underlying strengthening mechanisms of such a novel material is far from being understood. In this work, large-scale atomistic simulations of in-plane tension of the NLDP HEA are carried out in order to explore the HCP phase volume fraction-dependent strengthening. It is found that the dual-phase (DP) structure can significantly enhance the strength of the material, and the strength shows apparent phase volume fraction dependence. The yield stress increases monotonously with the increase of phase volume fraction, resulting from the increased inhibition effect of interphase boundary (IPB) on the nucleation of partial dislocations in the FCC lamella. There exists a critical phase volume fraction, where the flow stress is the largest. The mechanisms for the volume fraction-dependent flow stress include volume fraction-dependent phase strengthening effect, volume fraction-dependent IPB strengthening effect, and volume fraction-dependent IPB softening effect, that is, IPB migration and dislocation nucleation from the dislocation–IPB reaction sites. This work can provide a fundamental understanding for the physical mechanisms of strengthening effects in face-centered cubic HEAs with a nanoscale NLDP structure.

The role of 9R structures on deformation-induced martensitic phase transformations in dual-phase high-entropy alloys

The occurrence of transformation induced plasticity (TRIP) effects can be affected by the 9R structure, thus improving the mechanical properties of the alloy. However, the mechanism of the 9R structure during the phase transformation is still unclear. A new microscopic mechanism is proposed in this work, and a crystallographic model is established to explain the FCC→9R→HCP transformation processes. The 9R structure is obtained by adjusting the stacking fault energy (SFE) in Fe40Mn40-xCo20Crx high entropy alloy (HEAs) based on first-principles calculation. The calculations reveal that the interfacial synergism derived from the FCC and 9R structures lowers the cohesive energy and enhances stability. Moreover, the 9R structure provides more HCP phase nucleation cores and enhances the TRIP effect. This work proposes a valuable design concept for developing high-strength ductile structural materials.

Properties of AlFeNiCrCoTi0.5 High-Entropy Alloy Particle-Reinforced 6061Al Composites Prepared by Extrusion

(AlFeNiCrCoTi0.5)p/6061Al matrix composites were prepared by cold isostatic pressing combined with equal-diameter angular extrusion. The microstructure and properties of the extruded materials after adding high-entropy alloys were studied. The FCC + BCC dual-phase high-entropy alloy particles mechanically alloyed for 90 h were added to the aluminum matrix, while the composite material formed a diffusion interface after equal-diameter angular extrusion. Compared with the 6061Al matrix, when the content of AlFeNiCrCoTi0.5 was 10%, by two passes, the hardness increased from 52.5 HV to 70.3 HV, the tensile strength increased from 158 MPa to 188 MPa, and the elongation changed from 14.9% to 14.1%. The material had good comprehensive mechanical properties.