Effects of Cr/Fe Ratio on Structural Evolution and Tensile Properties of the Fe75.7-xCrxNi15.1Al4.6Ti4.6 High-Entropy Alloys

被引:3
|
作者
Ji, Yu [1 ]
Zhang, Long [2 ,3 ]
Lu, Xing [1 ]
Pang, Jingyu [2 ]
Lu, Yunzhuo [1 ]
Zhu, Zhengwang [2 ,3 ]
Fu, Huameng [2 ,3 ]
Zhang, Hongwei [2 ,4 ]
Li, Hong [2 ,3 ]
Zhang, Haifeng [2 ,3 ]
机构
[1] Dalian Jiaotong Univ, Sch Mat Sci & Engn, Dalian 116028, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
[3] Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
[4] Foshan Huizhen Technol Co Ltd, Sci & Technol Dept, Foshan 528200, Peoples R China
基金
中国国家自然科学基金;
关键词
high-entropy alloys; microstructural evolution; strengthening mechanisms; tensile properties; SOLID-SOLUTION PHASE; MECHANICAL-PROPERTIES; AL ADDITION; MICROSTRUCTURE; STABILITY; BEHAVIOR;
D O I
10.1002/adem.202200115
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
According to the effect of valence electron concentration (VEC) on the phase evolution of high-entropy alloys (HEAs), Fe75.7-xCrxNi15.1Al4.6Ti4.6 (at%, x = 17.1, 18.9, 20.6, 22.3, and 25.3) HEAs are designed. Effects of the Cr addition on the microstructure and tensile properties are investigated systemically. As the Cr/Fe ratio increases (i.e., decreasing VEC), there is a phase transition from face-centered-cubic (FCC) to body-centered-cubic (BCC) and Heusler-type beta ' -Ni2TiAl (L2(1)). When x is between 17.1 and 22.3, the alloys, with the mixed structure of the FCC and BCC/L2(1) phases, behave like composites with a sharp increase in strength but reduced ductility. When x = 25.3, the alloy, with only BCC/L2(1) phases, becomes extremely brittle. Specifically, Fe56.8Cr18.9Ni15.1Al4.6Ti4.6 exhibits a good combination of a high strength of 1142 MPa and an elongation strain of 9.5%. The excellent tensile properties of this alloy are attributed to the synergetic effects of a soft FCC phase, a hard BCC phase, and the uniform distribution of high-density L2(1) nanoparticles in BCC matrix. The phase-evolution principle is delineated by parameters of the VEC and the atomic size difference (delta), and the strengthening mechanism is well discussed. These findings offer a guidance for the development of BCC/L2(1)-containing HEAs for practical applications.
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页数:9
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