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

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外文摘要：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.

外文关键词：

Medium entropy alloyPrecipitation strengtheningHeterogeneous microstructureTransformation-induced plasticityMechanical properties

作者：

Qiuyu Gao、Xinghua Zhang、Shilin Feng、Zhenhua Han、Chen Chen、Tan Wang、Shaojie Wu、Yongfu Cai、Fushan Li、Ran Wei

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作者单位：

School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China

School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaHenan Provincial Science and Technology Research Project

项目编号：

5210105352274399232102231025

出版年：

2024

DOI：

10.1016/j.jmst.2023.10.022

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)：2024.183(16)