A new CrFeNi2Al eutectic high entropy alloy system with excellent mechanical properties

被引：251
作者：
Jin, Xi [1 ]
Bi, Juan [1 ]
Zhang, Lu [1 ]
Zhou, Yang [1 ]
Du, Xingyu [1 ]
Liang, Yuxin [1 ]
Li, Bangsheng [1 ,2 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin, Heilongjiang, Peoples R China
[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin, Heilongjiang, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 770卷
基金：
中国国家自然科学基金;
关键词：
Eutectic high entropy alloy; Mechanical properties; Microstructure; Design strategy; DEFORMATION MECHANISMS; HIGH-STRENGTH; MICROSTRUCTURE; EVOLUTION; CO; DUCTILITY; STRATEGY; BEHAVIOR; ELEMENTS;
D O I：
10.1016/j.jallcom.2018.08.176
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A low-cost Co-free CrFeNi(3-x)Alx (x = 1, 0.9, 0.8, 0.7, 0.6) eutectic high entropy alloy (EHEA) system was designed, successfully prepared and characterized. With the increase of Al content, the alloy dramatically transforms from a hypoeutectic to a hypereutectic microstructure together with an increase in strength and a decrease in ductility. The CrFeNi2.2Al0.8 alloy was found to be an eutectic high entropy alloy and was composed of face centered cubic (FCC) phase and ordered body centered cubic (B2) phase. The hypereutectic CrFeNi2Al alloy shows excellent mechanical properties with an ultimate strength of 1357 MPa and a total elongation of 6.4% at the cast condition. The excellent mechanical properties of this EHEA system can be attributed to the nanolamellar microstructure and suggests a great potential application in the engineering field. We also propose a simple strategy to design Co-free EHEAs and predict more than ten potential Co-free EHEAs to guide experimental searches. (C) 2018 Elsevier B.V. All rights reserved.
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页码：655 / 661
页数：7
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