材料科学技术(英文版)2024，Vol.183Issue(16) ：175-183.DOI:10.1016/j.jmst.2023.10.022

Achieving ultra-high mechanical properties in metastable Co-free medium entropy alloy via hierarchically heterogeneous microstructure

Qiuyu Gao Xinghua Zhang Shilin Feng Zhenhua Han Chen Chen Tan Wang Shaojie Wu Yongfu Cai Fushan Li Ran Wei
材料科学技术(英文版)2024，Vol.183Issue(16) ：175-183.DOI:10.1016/j.jmst.2023.10.022
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Achieving ultra-high mechanical properties in metastable Co-free medium entropy alloy via hierarchically heterogeneous microstructure

Qiuyu Gao 1Xinghua Zhang 2Shilin Feng 1Zhenhua Han 3Chen Chen 1Tan Wang 1Shaojie Wu 1Yongfu Cai 1Fushan Li 1Ran Wei1
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作者信息

  • 1. School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China
  • 2. School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China
  • 3. School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China
  • 折叠

Abstract

A new metastable dual-phase Fe59Cr13Ni18Al1o medium entropy alloy(MEA)with hierarchically heteroge-neous microstructure from micro-to nano-scale was designed in this work.Partially recrystallized FCC phase and lots of NiAl-rich B2 precipitates are obtained by annealing and aging treatment.The yield strength of the MEA at room temperature(298 K)and liquid nitrogen temperature(77 K)increased from～910 MPa and～1250 MPa in the annealed state,respectively,to～1145 MPa and～1520 MPa in the aged state,while the uniform elongation maintained more than 15％.The excellent mechanical properties of the MEA both at 298 and 77 K are attributed to the co-activation of multiple strengthening mech-anisms,including fine grain,dislocation,precipitation,transformation-induced plasticity,stacking faults,and nano-twins.

Key words

Medium entropy alloy/Precipitation strengthening/Heterogeneous microstructure/Transformation-induced plasticity/Mechanical properties

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基金项目

National Natural Science Foundation of China(52101053)

National Natural Science Foundation of China(52274399)

Henan Provincial Science and Technology Research Project(232102231025)

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)

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影响因子：0.657
ISSN：1005-0302
参考文献量72
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