A novel D022-strengthened medium entropy alloy with outstanding strength-ductility synergies over ambient and intermediate temperatures

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外文摘要：Precipitation-strengthened medium/high-entropy alloys(MEAs/HEAs)have great potential for high-temperature applications.In this study,we designed a novel Ni45.9Fe23Cr23V4Nb3Mo1B0.1(at.％)MEA alloy,hardened by the D022(Ni,Fe,Cr)3(Nb,V)-type nanoprecipitates,with an excellent strength-ductility com-bination from room to elevated temperatures.Specifically,the tensile strengths,at 700 and 800 ℃,could be maintained as high as 845 and 589 MPa,respectively;meanwhile,elongations at all testing temper-atures exceeded 25％without any intermediate-temperature embrittlement.The temperature-dependent deformation mechanisms were unraveled using multi-scale characterizations,which involved profound slip planarities,such as stacking fault(SF)networks and deformation twins(DTs).Furthermore,the crit-ical resolved shear stress(CRSS)to initiate SFs in both face-centered cubic(FCC)and D022 phases was evaluated,and the possible reasons for the origin of anomalous DTs at 800 ℃ were discussed in de-tail.The main findings demonstrate that the shearable D022 nanoparticles can provide the FCC matrix with considerable dislocation storage capacity,reinforcing strain hardening at ambient and intermedi-ate temperatures.This work provides fundamental insights into the controllable design and deformation mechanisms of high-performance D022-strengthened MEAs/HEAs.

外文关键词：

Precipitation strengtheningMedium-entropy alloysD022 phaseIntermediate-temperature embrittlementHigh-temperature deformation

作者：

Jie Gan、Jinxiong Hou、Tzuhsiu Chou、Xier Luo、Jiang Ju、Junhua Luan、Guoqiang Huang、Bo Xiao、Jixun Zhang、Jianyang Zhang、Yakun Tao、Junheng Gao、Tao Yang

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作者单位：

Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China

Hong Kong Branch of National Precious Metals Material Engineering Research Centre(NPMM),City University of Hong Kong,Hong Kong,China

Department of Mechanical Engineering,City University of Hong Kong,Hong Kong,China

National Center for International Research on Deep Earth Drilling and Resource Development,Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China

Research Institute for Carbon Neutrality,University of Science and Technology Beijing,Beijing 100083,China

Liaoning Academy of Materials,Shenyang 110000,China

City University of Hong Kong Shenzhen Research Institute,Shenzhen 518057,China

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出版年：

2024

DOI：

10.1016/j.jmst.2024.02.057

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)：2024.202(35)