Intermetallics最新文献

{"title":"Multi-precipitate synergetic strengthening in LPBF-fabricated maraging steel: Interplay of intermetallic compounds and oxide nanoparticles","authors":"Lingzhi Wu ,&nbsp;Cong Zhang ,&nbsp;Dil Faraz Khan ,&nbsp;Ruijie Zhang ,&nbsp;Yongwei Wang ,&nbsp;Haiqing Yin ,&nbsp;Xuanhui Qu ,&nbsp;Geng Liu ,&nbsp;Jie Su","doi":"10.1016/j.intermet.2025.109005","DOIUrl":"10.1016/j.intermet.2025.109005","url":null,"abstract":"<div><div>Laser powder bed fusion (LPBF) is particularly suitable for direct fabrication of metallic components with complex geometries, and has been widely used in aerospace, nuclear energy, and high-end tooling industries. However, the as-printed properties of LPBF-processed Fe-11Cr-9Ni-6Co-3Mo (wt.%) maraging stainless steel often fail to meet application requirements. This study systematically investigates the effects of heat treatment on the microstructure and mechanical properties of LPBF-Fe11Cr9Ni6Co3Mo. The results show that direct aging at 550 °C for 9 h leads to a multi-nanoprecipitate co-strengthening microstructure, including in-situ formed composite oxide (Mn,Si)O, (Cr,Mo)₂₃C₆ carbides, and Fe₂(Mo,Mn) intermetallic compounds. Through the combined effects of multi-scale precipitation strengthening, improvement in strength and ductility is achieved. Compared to the as-printed condition, the aged samples exhibit a 47.4 % increase in yield strength, a 29.8 % enhancement in ultimate tensile strength, and a 3.3 % improvement in elongation. Furthermore, compared to conventional heat treatment (homogenization + solution treatment + undercooling + aging), the direct-aged samples demonstrate superior mechanical properties without sacrificing ductility, with a 1.94 % higher yield strength, a 3.50 % greater ultimate tensile strength, and a 3.70 % improved elongation.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109005"},"PeriodicalIF":4.8,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The evolution and deterioration of the B2 phase and corresponding mechanical properties in the BCC/B2 refractory high-entropy superalloys","authors":"Xiaofang Ma ,&nbsp;Zhengfan Wang ,&nbsp;Liang Chen ,&nbsp;Peng Yang","doi":"10.1016/j.intermet.2025.109014","DOIUrl":"10.1016/j.intermet.2025.109014","url":null,"abstract":"<div><div>Refractory high-entropy superalloys (RHESAs) with a coherent BCC/B2 microstructure, analogous to the γ/γ′ structure in Ni-based superalloys, are regarded as promising candidates to surpass Ni-based superalloys due to their high melting points and exceptional creep resistance. However, the inherent brittleness and high-temperature instability of the B2 phase limit their practical application. This study focuses on the Al_9.26Nb_17.92Ta_18.4Ti_43.47Zr_10.95 (at.%) RHESA prepared via arc melting, followed by homogenization and aging treatments for various durations. The phase evolution pathways, elemental diffusion mechanisms, and mechanical property changes during aging were systematically investigated using transmission electron microscopy (TEM) and room-temperature compression testing. The results demonstrate that in the ST (solution-treated) state, the B2 phase exists as nanodomains smaller than 5 nm, formed through spinodal decomposition and the ordering reaction. During aging for 5–60 h, the B2 phase grows into an interconnected network structure. The 60h-aged sample exhibits a ∼25 % increase in strength without compromising ductility. After 150 h of aging, the B2 phase degenerates radially from elongated precursors to form Al-Zr intermetallic compounds, accompanied by the expulsion of Ti, Nb and Ta element. While both strength and ductility remain largely unchanged, a significant reduction in the strain hardening rate is observed. This study reveals the evolution mechanism of the B2 phase and the formation pathway of the Al–Zr intermetallic phase. For the first time, the intermediate process of the direct deterioration of the B2 phase into the Al–Zr intermetallic compound was directly observed using TEM, and meanwhile, a novel Ta-rich cubic phase was identified during the evolution process. Those provides a theoretical foundation for further optimizing the high-temperature stability of RHEAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109014"},"PeriodicalIF":4.8,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145156004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The microstructure and mechanical properties of TLP bonding with (SnBiInZn)100-xGax high entropy alloys","authors":"Mo Chen ,&nbsp;Liang Zhang ,&nbsp;Yu-hao Chen ,&nbsp;Lei Sun","doi":"10.1016/j.intermet.2025.109008","DOIUrl":"10.1016/j.intermet.2025.109008","url":null,"abstract":"<div><div>In this experiment, (SnBiInZn)_{100-<em>x</em>}Ga_<em>x</em> (<em>x</em> = 0.5, 1, 2, 4, at.%) high entropy alloys (HEAs) were prepared in a vacuum furnace, and Cu/(SnBiInZn)_{100-<em>x</em>}Ga_<em>x</em>/Cu solder joints for sandwich construction were prepared by transient liquid phase (TLP) bonding at 160 °C. The effects of different Ga content and bonding time on the interface intermetallic compound (IMC) layer and mechanical properties of the joints were investigated. The results showed that when the Ga content was lower than 1 at.%, Ga atoms were almost completely solid-soluted inside the microstructure and did not affect the strength of the joint. Exceeding this critical level led to Ga being firmly incorporated into the IMC layer's surface, impairing the interfacial bonding and triggering an abrupt drop in shear strength. Specifically, when Ga was 0.5 at.%, the IMC layer at the interface thickened progressively with longer bonding durations. After 30 min, the CuZn₅ IMC fully transformed into the stable Cu₅Zn₈ phase, resulting in a shear strength of up to 31.7 MPa. The fracture surface exhibited large honeycomb-like dimples, indicative of a ductile fracture. Successful formation of high-quality joints under low-temperature bonding conditions has been realized. However, when the bonding time was excessively prolonged, the Cu₅Zn₈ IMC layer grew too thick. Due to the significant difference in Cu and Zn diffusion speeds, Kirkendall voids and cracks formed, ultimately degrading the shear strength of the joint. The soldered joints tended to fracture along the Kirkendall voids at the interface, and the fracture mechanism shifted from ductile to brittle.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109008"},"PeriodicalIF":4.8,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145156003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of 800°C NaCl salt-spray corrosion on fracture behavior and deformation mechanism in a NiCoCr-based superalloy","authors":"Zhongfeng Chen ,&nbsp;Anping Dong ,&nbsp;Zhengye Zhang ,&nbsp;Lin He ,&nbsp;Dafan Du ,&nbsp;Lianghua Xiong ,&nbsp;Yunwei Pan","doi":"10.1016/j.intermet.2025.109013","DOIUrl":"10.1016/j.intermet.2025.109013","url":null,"abstract":"<div><div>NiCoCr-based superalloys operating in marine environments are subjected to severe corrosion, which can significantly affect their mechanical performance. In this study, a systematic investigation is carried out to elucidate the effects of NaCl salt-spray exposure at 800 °C on fracture behavior and deformation mechanisms of a newly developed γ′-strengthened NiCoCr-based superalloy, K439B. The tensile tests reveal a degradation of mechanical performance after NaCl salt-spray exposure at 800 °C for 70 h: the ultimate tensile strength (UTS) decreases from 1113 MPa to 816 MPa, and the elongation at break (EL) drops from 6.0 % to 1.2 %. Fracture morphologies show that the uncorroded specimen exhibits mixed ductile-brittle fracture features with quasi-cleavage facets, ductile dimples, and slip-band evidence, whereas the corroded specimen develops a corrosion-affected zone at the fracture edge, containing a high density of corrosion-induced voids. These voids are considered as crack initiation sites and stress concentrators, promoting brittle failure. Elemental distribution within the corrosion-affected zone reveals the depletion of Cr and γ′-forming elements (<em>e.g.</em>, Al, Ti), and the local stress concentrations adjacent to corrosion voids are observed. In addition, the uncorroded specimen deforms primarily by planar slip and stacking fault cutting γ′ phase, while the corroded specimen shows dense dislocation tangling around corrosion voids and pile-up at the grain boundary and around the Al oxides, leading to the significant decrease in ductility. The results show mechanical degradation and altered deformation mechanisms in K439B alloy after NaCl salt-spray exposure at 800 °C, offering critical insights for evaluating its service performance in high-temperature marine environments.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109013"},"PeriodicalIF":4.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145156002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling formation mechanism, phase stability and transitions of metastable α2 and B2 phases in laser additively manufactured Ti-48Al-2Cr-2Nb alloy","authors":"Maosong Wang,&nbsp;Haojie Luo,&nbsp;Aoqi Fan,&nbsp;Yulei Du","doi":"10.1016/j.intermet.2025.109012","DOIUrl":"10.1016/j.intermet.2025.109012","url":null,"abstract":"<div><div>The solidification route and microstructure evolution of TiAl alloys are strongly dependent on cooling rate, leading to a significant presence of ordered α₂ and B2 phases in those fabricated using laser powder bed fusion (LPBF). However, the formation mechanisms, thermal stability and decomposition behaviors of this special phase composition remain unclear. In this work, we studied a Ti-48Al-2Cr-2Nb alloy fabricated by LPBF to understand its unique ordered phase structure. It was found that both the high-temperature α and β phases can nucleate and grow from the liquid TiAl, and subsequently transform to metastable α₂ and B2 phases through ordered transition. The minimum cooling rate for the transition of <em>β→B2</em> was determined as 3.28 × 10⁴ K/s, with the content of the B2 phase increasing at higher cooling rate. Based on in-situ characterization and annealing treatment, both the ordered α₂ and B2 phases were revealed to exhibit weak thermal stability, which were attributed to their special chemical composition deviated from that in equilibrium solidification due to insufficient atomic diffusion. This phenomenon also results in the formation of disordered γ phase and early precipitation of high-temperature α and β phases during heat treatment. This study provides valuable insights into the microstructural characteristic of Ti-48Al-2Cr-2Nb alloys fabricated at high cooling rate, offering guidance for the LPBF building and post heat treatment process.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109012"},"PeriodicalIF":4.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of L12 nanoparticles strengthened Ni-Co-Al-Ta based superalloys with excellent comprehensive properties","authors":"Haojun Zhuo ,&nbsp;Debin Zheng ,&nbsp;Chen Yang ,&nbsp;Yihui Guo ,&nbsp;Jiajia Han ,&nbsp;Cuiping Wang ,&nbsp;Xingjun Liu","doi":"10.1016/j.intermet.2025.109007","DOIUrl":"10.1016/j.intermet.2025.109007","url":null,"abstract":"<div><div>This study addresses a critical research gap by pioneering a systematic alloy design in the Co-Ni-Al-Ta system, leveraging a thermodynamic database and CALPHAD method to optimize Ni content, leading to the development of a novel Co-45Ni-12Al-4Ta-2W superalloy with exceptional properties. Key innovations include the identification of an optimal Co-45Ni-12Al-4Ta master alloy and comprehensive analysis of γ′-forming elements (Mo, V, W, Ti, Nb), which revealed that W addition achieves an optimal balance between different properties: intermediate γ′/γ misfit (1.08 %) and low coarsening rate ((1.07 ± 0.07) × 10⁻²⁷ m³/s), coupled with unprecedented thermal stability (γ′ solvus at 1250 °C and solidus at 1372 °C). Remarkably, this alloy demonstrates anomalous strengthening at 650 °C, yielding compressive strengths of 1059 ± 32 MPa (RT), 1060 ± 31 MPa (650 °C), and 668 ± 21 MPa (900 °C), highlighting its potential for next-generation aerospace materials through further optimization.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109007"},"PeriodicalIF":4.8,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated design of superhydrophobic structures and photocatalytic functions of Zr46Cu46Al8 metallic glass surfaces","authors":"Guanzhong Ding ,&nbsp;Guoyang Zhang ,&nbsp;Ranfeng Wei ,&nbsp;Yujia Wang ,&nbsp;Rui Zheng ,&nbsp;Qijing Sun ,&nbsp;Jingwang Lv ,&nbsp;Haipeng Wang ,&nbsp;Dan Li ,&nbsp;Paul K. Chu ,&nbsp;Li Liu ,&nbsp;Xiangjin Zhao","doi":"10.1016/j.intermet.2025.109009","DOIUrl":"10.1016/j.intermet.2025.109009","url":null,"abstract":"<div><div>Metallic glasses have considerable potential in applications such as wastewater degradation, but the corrosion resistance and catalytic degradation performance require improvement. Herein, this study presents a simple electrochemical strategy that simultaneously improves the superhydrophobic properties of the cathode and anode surfaces by using Zr₄₆Cu₄₆Al₈ metallic glass as the cathode and anode substrates. The etched surface on the anode comprises a micro-nanometer composite coating of ZrO₂/CuO/Cu₂O, while the cathode surface has a micro-nanometer composite structure of CuO/Cu₂O/Fe₂O₃. The composite oxides produce enhanced catalytic degradation characteristics on the substrate. The micro-nanometer structures formed on the metallic glass surface give rise to superhydrophobicity, which improves the corrosion resistance and adaptability to complex environments. Furthermore, the stability and cyclic degradation capability are excellent, boding well for industrial implementation. Our results reveal a novel strategy to improve both the structure and functions of metallic glasses for different applications such as wastewater treatment.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109009"},"PeriodicalIF":4.8,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser-deposited CoCrFeNiTiAlx high-entropy alloy coatings featuring balanced wear and corrosion resistance","authors":"Fengyuan Shu ,&nbsp;Jia Deng ,&nbsp;Hua Yang ,&nbsp;Xin Zhang ,&nbsp;Zhuqiang Xiang ,&nbsp;Jie Wang ,&nbsp;Guibian Li ,&nbsp;Yuzhong Ren ,&nbsp;Bing Lei ,&nbsp;Xin Yuan","doi":"10.1016/j.intermet.2025.109004","DOIUrl":"10.1016/j.intermet.2025.109004","url":null,"abstract":"<div><div>CoCrFeNiTiAl_x (x = 0, 0.5, 0.75, 1.0) high-entropy alloy (HEA) coatings were fabricated by laser deposition (LD) technology and the effect of Al content in microstructure-property relationships was systematically investigated. The HEA coatings contain face-centered cubic(FCC) and body-centered cubic(BCC) structure, with ordered B2-type Al-Ni compounds emerging at x = 1. Increasing Al content promoted a progressive FCC to BCC phase transformation accompanied by lattice distortion and grain refinement. Notably, Al addition significantly improved coating formability by suppressing crack initiation during LD processes through its deoxidizing reduction and slagging capabilities, which optimized melt fluidity and minimized structural defects such as pores and cracks. The microhardness exhibited a 44 % enhancement (616.12  →  887.26 HV) with gradually Al increase, attributed to synergistic BCC phases, solid solution and Hall-Petch refinement strengthening. The average coefficient of friction and wear rate of the coatings both showed a decreasing trend, specifically an 83 % reduction in wear rate (14.12  →  2.42 × 10⁻⁵ mm³/N·m) at x = 0.75. Al addition converted the wear mechanism from adhesive-abrasive wear to oxidative wear via in-situ formation of Al₂O₃/Cr₂O₃ tribofilms. Al alloying also enhanced the corrosion resistance of the HEAs. The Al₁ coating exhibited the lowest I_corr (8.72 μA/cm²) and highest charge-transfer resistance(R_ct). These properties are attributed to the formation of denser and more stable Cr₂O₃ and TiO₂ passive film, which hindered the Cl⁻ transport and strengthened the anti-corrosion mechanism. The Al₁ coating exhibited the optimal comprehensive performance, which provided guidance for designing Al-containing HEAs with balanced corrosion resistance and mechanical performance.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109004"},"PeriodicalIF":4.8,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced Strength and Toughness of SiCf/SiC joints though Zr-induced Core-Shell Microstructure evolution in high entropy brazing fillers","authors":"Heng Shao ,&nbsp;Haiyan Chen ,&nbsp;Peng Wang ,&nbsp;Shuai Zhao ,&nbsp;Zhaoyi Pan ,&nbsp;Yongsheng Liu ,&nbsp;Xiaoguo Song ,&nbsp;Pengcheng Wang ,&nbsp;Weimin Long ,&nbsp;Wenya Li","doi":"10.1016/j.intermet.2025.109010","DOIUrl":"10.1016/j.intermet.2025.109010","url":null,"abstract":"<div><div>This study utilizes (FeCoNiCrCu)_100-X Zr_X (X = 10, 15) high-entropy brazing alloys to enable reliable joining of SiC_f/SiC composites to Zr using a vacuum brazing furnace. Microscopic analysis shows that increasing the Zr content to 15 at% significantly improves the wettability of the brazing alloy and promotes the formation of a distinctive “ZrCrFe core–Zr₂Cu shell” microstructure. Compared with the ZrCrFe phase, the Zr₂Cu phase exhibits enhanced plastic deformation capacity. After encapsulating the brittle ZrCrFe phase, it promotes the formation of a region near the SiC_f/SiC interface dominated by plastic FCC phases and Zr₂Cu phases. The Zr₂Cu phase exhibits a coherent crystallographic orientation with the FCC matrix phase, indicating a relatively low lattice mismatch. The wrapped structure contributes to joint toughening through two primary mechanisms: (1) it prevents direct contact between the brittle ZrCrFe phase and the SiC_f/SiC composite, thereby mitigating crack initiation; and (2) it alleviates residual stress concentrations at the ZrCrFe–FCC interface caused by lattice mismatch, enhancing the overall plastic deformation capacity. Finally, the shear strength of the joint containing 15 at% Zr reached 78.61 MPa, representing a 22.4 % increase compared to the specimen containing 10 at% Zr, and indicating enhanced plastic deformation capacity and overall joint strength.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109010"},"PeriodicalIF":4.8,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Ta addition on microstructure, compression and wear properties of CoCrNiTax medium entropy alloys","authors":"Qing Xu ,&nbsp;Senqi Qu ,&nbsp;Xiaojing Xu ,&nbsp;Chenglong Zhao ,&nbsp;Cheng Ai ,&nbsp;Yi Ru ,&nbsp;Heng Zhang ,&nbsp;Shusuo Li ,&nbsp;Shengkai Gong ,&nbsp;Min Guo ,&nbsp;Taiwen Huang ,&nbsp;Lin Liu","doi":"10.1016/j.intermet.2025.109011","DOIUrl":"10.1016/j.intermet.2025.109011","url":null,"abstract":"<div><div>Effect of Ta content on microstructure and mechanical properties of CoCrNiTa_<em>x</em> medium entropy alloys (<em>x</em> = 0.1–0.5) was discussed. With increasing Ta content, CoCrNiTa_<em>x</em> alloys changed from hypoeutectic (<em>x</em> = 0.1, 0.3) to eutectic (<em>x</em> = 0.35) and to hypereutectic (<em>x</em> = 0.4, 0.5) alloys, and CoCrNiTa_<em>x</em> alloys were all composed by γ phase and C14-type Laves phase. Meanwhile, microhardness of CoCrNiTa_<em>x</em> alloys increased with increasing Ta content. With increasing Ta content, compressive strengths of CoCrNiTa_<em>x</em> alloys firstly increased and then decreased, and CoCrNiTa_0.35 alloy had the highest compression strength (2852 MPa). Nanohardness of primary γ phase was much lower than that of primary Laves phase, and nanohardness of eutectic phases firstly increased and then decreased with increasing Ta content. In addition, nanohardness of γ phase in CoCrNiTa_<em>x</em> alloy was higher than that of γ phase in CoCrFeNiTa_<em>x</em> alloy, which provided a notable contribution to compression strengths of CoCrNiTa_<em>x</em> alloys. Wear mechanism gradually changed from adhesive wear to abrasive wear with increasing Ta content, and CoCrNiTa_0.5 alloy exhibited the highest wear resistance.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"187 ","pages":"Article 109011"},"PeriodicalIF":4.8,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}