A Novel BCC/B2 Structural Nb_(38)Ti_(35)Al_(15)V_(6)Cr_(4)(TaHfMoW)_(2) Refractory High‑Entropy Alloy with Excellent Specifc Yield Strength‑Plasticity Synergy  

作　　者：Hongbin Liu Zhenqiang Xing Yitong Yang Jingyu Pang Wen Li Zhengwang Zhu Long Zhang Aimin Wang Haifeng Zhang Hongwei Zhang 

机构地区：[1]School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110159,China [2]Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]Foshan Sino-Tech Industrial Technology Research Institute,Foshan 528000,China [4]School of Metallurgy,Northeastern University,Shenyang 110819,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第3期396-406,共11页金属学报(英文版)

基　　金：supported by the Chinese Academy of Sciences(ZDBS-LY-JSC023),the National Natural Science Foundation of China(No.52404370);the Natural Science Foundation of Liaoning Province(2023-BS-012);the Youth Innovation Promotion Association CAS(2021188);the IMR Innovation Fund(2023-PY16);the Guangdong Basic and Applied Basic Research Foundation(2023A1515111060).

摘　　要：Refractory high-entropy alloys(RHEAs)stand as promising candidates for the development of a new generation of hightemperature materials due to their exceptional mechanical properties.However,the inherent low ductility and high density of RHEAs have hindered their widespread adoption in industrial applications.In this study,an Nb_(38)Ti_(35)Al_(15)V_(6)Cr_(4)(TaHfMoW)_(2) RHEA with a BCC/B2 dual-phase structure is successfully developed.The RHEA exhibits excellent specifc yield strength of 162.4 MPa·g^(−1)·cm^(3) and 84.3 MPa·g^(−1)·cm^(3) at room temperature(RT)and 800℃,respectively.It was found that the pinning efect of the B2 phase induces a gradual transition in dislocation slip mode from planar slip to cross slip,homogenizing the plastic fow and resulting in excellent compression plasticity(ε>50%).Additionally,the B2 phase endows the alloy with excellent yield strength at high temperatures by precipitation strengthening.Moreover,the dominated a/2<111>type dislocation contributes to the alloy's superior plasticity at high temperatures.

关 键 词：Refractory high entropy alloy B2 phase Microstructure Mechanical property Deformation mechanism 

分 类 号：TG1[金属学及工艺—金属学]