首页|Creep in a nanocrystalline VNbMoTaW refractory high-entropy alloy

Creep in a nanocrystalline VNbMoTaW refractory high-entropy alloy

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Refractory high-entropy alloys(RHEAs)are considered to be a promising candidate for elevated temper-ature applications.Nanocrystalline(NC)RHEAs are supposed to exhibit many different high-temperature mechanical behaviors in comparison with their coarse-grained(CG)and ultrafine-grained(UFG)counter-parts.However,the creep behaviors of NC RHEAs,which must be well evaluated for high-temperature applications,are largely unknown because it is difficult to produce bulk quantities of NC RHEAs for creep tests.In the present work,an equiatomic bulk NC VNbMoTaW RHEA with an average grain size of 67±17 nm was synthesized by mechanical alloying(MA)and the subsequent high-pressure/high-temperature sintering.The creep tests were performed on bulk specimens by compression at high tem-peratures(973 and 1073 K)under different stresses(70-1100 MPa).The creep resistance of the bulk NC VNbMoTaW is slightly lower than that of the bulk CG VNbMoTaW,but much higher than that of previ-ously reported CG and UFG HEAs.The derived activation volume,stress exponent,and activation energy of bulk NC VNbMoTaW indicate that the creep deformation is dominated by grain boundary diffusion.The creep deformation is controlled by the diffusion of Mo and Nb elements,which have the two slowest grain boundary diffusivities among the five alloying elements.The present work provides a fundamental understanding of the creep behavior and deformation mechanism of NC RHEAs,which should help design advanced creep-resistant RHEAs.

NanocrystallineVNbMoTaWRefractory high-entropy alloyCreep behaviorsGrain boundary diffusion

Xun Shen、Baoru Sun、Shengwei Xin、Shuaijun Ding、Tongde Shen

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Clean Nano Energy Center,State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaHigh-Level Talents Research Program of the Yanshan UniversityYouth Fund Project of Science and Technology Research of Hebei ProvinceNatural Science Foundation of Hebei ProvinceNatural Science Foundation of Hebei Province

1193500451971195606001101QN2020210E2019203465B2020203037

2024

10.1016/j.jmst.2023.11.019

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.187(20)
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