Enhanced mechanical performance of grain boundary precipitation-hardened high-entropy alloys via a phase transformation at grain boundaries

Y.L.Qi ¹L.Zhao ¹X.Sun ¹H.X.Zong ¹X.D.Ding ¹F.Jiang ¹H.L.Zhang ¹Y.K.Wu ¹L.He ¹F.Liu ²S.B.Jin ³G.Sha ³J.Sun¹

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作者信息

1. State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an,710049,China
2. Analytical&Testing Center,Northwestern Polytechnical University,Xi'an,710072,China
3. School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing,210094,China
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Abstract

Grain-boundary(GB)precipitation has a significant adverse effect on plasticity of alloys,which easily leads to catastrophic intergranular failure in safety-critical applications under high external loading.Herein,we report a novel strategy that uses the local stress concentration induced by GB precipitates as a driving force to trigger phase transformation of preset non-equiatomic high-entropy solid-solution phase at GBs.This in situ deformation-induced phase transformation at GBs introduces a well-known effect:transformation-induced plasticity(TRIP),which enables an exceptional elongation to fracture(above 38％)at a high strength(above 1.5 GPa)in a GB precipitation-hardened high-entropy alloy(HEA).The present strategy in terms of"local stress concentration-induced phase transformations at GBs"may provide a fundamental approach by taking advantage of(rather than avoiding)the GB precipitation to gain a superior combination of high strength and high ductility in HEAs.

Key words

Non-equiatomic/Grain-boundary precipitation/High-entropy alloys/Ductility/Transformation-induced plasticity

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基金项目

This work was supported financially by the National Natural Science Foundation of China(51871178)

出版年

2021

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)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量53

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