Novel Co-rich high entropy alloys with superior tensile properties
Novel Co-rich high entropy alloys with superior tensile properties
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DOI：
10.1080/21663831.2018.1553803
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发表时间：
2019-01-01
影响因子：
8.3
通讯作者：
Chiba, Akihiko
中科院分区：
文献类型：
--
作者：
Wei, Daixiu;Li, Xiaoqing;Chiba, Akihiko
我们开发了一系列富含Co的CoxCr25（FeNi）（75-x）（x = 35，45，55，65）高熵合金，其具有改进的强度和/或延展性，源自降低等原子CoCrFeNi合金的层错能（SFE）和降低fcc相稳定性。热力学和从头计算表明，增加钴，而降低铁和镍的浓度降低超临界流体萃取和降低fcc相稳定性。Co35Cr25Fe20Ni20和Co45Cr25Fe15Ni15合金具有单一的面心立方相，表现出优异的上级拉伸性能，这是由于孪晶和面心立方→六方相马氏体相变所致。本研究为高性能高熵合金的设计提供了指导。通过降低层错能和降低等原子CoCrFeNi合金的相稳定性，开发了一系列具有增强拉伸性能的新型富Co非等原子高熵合金。
We developed a series of Co-rich CoxCr25(FeNi)(75-x) (x = 35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co35Cr25Fe20Ni20 and Co45Cr25Fe15Ni15 alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc -> hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys.[GRAPHICS]IMPACT STATEMENTA series of novel Co-rich non-equiatomic high entropy alloys with enhanced tensile properties were developed by lowering the stacking fault energy and reducing the phase stability of equiatomic CoCrFeNi alloy.