材料科学技术(英文版)2024，Vol.197Issue(30) ：116-128.DOI:10.1016/j.jmst.2024.03.002

An ultrafine-grained low-activation multicomponent alloy with exceptional thermal stability and ultrahigh-temperature mechanical properties

Xinkai Wang Kefu Gan Bin Liu Qiankun Yang Yong Zhang Dingshun Yan Zhiming Li
材料科学技术(英文版)2024，Vol.197Issue(30) ：116-128.DOI:10.1016/j.jmst.2024.03.002
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An ultrafine-grained low-activation multicomponent alloy with exceptional thermal stability and ultrahigh-temperature mechanical properties

Xinkai Wang 1Kefu Gan 2Bin Liu 1Qiankun Yang 2Yong Zhang 2Dingshun Yan 2Zhiming Li3
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作者信息

  • 1. State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China
  • 2. School of Materials Science and Engineering,Central South University,Changsha 410083,China
  • 3. State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China
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Abstract

We developed a novel low-activation,ultrafine-grained W-Cr-V multicomponent alloy(MCA)with excel-lent thermal stability and desirable high-temperature strength.The as-sintered W70Cr15V15(at.％)alloy was mainly composed of a body-centered cubic(BCC)solid solution matrix with an average grain size of～0.45 μm,minor hexagonal close-packed(HCP)phase,and ultrafine oxides at grain boundary(GB)regions.The average grain size of the MCA was＜2 μm after heating at 1500 ℃ for 1 h,showing a high thermal stability of the microstructure.Accordingly,the estimated grain growth exponent n(～7)and the corresponding activation energy(～433 kJ mol-1)of the MCA indicate that diffusion during the grain growth in the present W-Cr-V alloy is dominated by the GB diffusion.Such high thermal stability can be mainly attributed to the significant pinning effects from the in-situ formed oxides at GBs.Besides,the nonequilibrium segregation of Cr and V at GBs also contributes to the thermal stability of the alloy at temperatures of 1200 ℃ and below.Furthermore,the average high-temperature compressive strength of the alloy was over 1376 MPa at 1100 ℃,mainly due to the prominent solid solution and GB strengthening which were still effective at the high temperature.The results indicate that the present low-activation W-Cr-V alloy system with exceptional thermal stability and high-temperature mechanical properties could be a promising candidate for structural materials in future fusion reactors.

Key words

Ultrafine-grain/Low-activation/Refractory multicomponent alloy/Thermal stability/Ultrahigh-temperature strength/In-situ second phases

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基金项目

National Natural Science Foundation of China(51971248)

National Natural Science Foundation of China(52201154)

National Natural Science Foundation of China(52101166)

National Natural Science Foundation of China(52020105013)

Natural Science Foundation of Hunan province in China(2023RC1013)

Natural Science Foundation of Hunan province in China(2021JJ10056)

Natural Science Foundation of Hunan province in China(2021JJ40736)

Fundamental Research Funds for the Central Universities of Central South University(2020zzts072)

出版年

2024
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
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