Understanding the yield strength difference in dual-phase eutectic high-entropy alloys

被引：32
作者：
Mao, Zhouzhu [1 ]
Jin, Xi [1 ]
Xue, Zan [1 ]
Zhang, Min [1 ]
Qiao, Junwei [1 ,2 ]
机构：
[1] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China
[2] Taiyuan Univ Technol, Key Lab Interface Sci & Engn Adv Mat, Minist Educ, Taiyuan 030024, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 867卷
基金：
中国国家自然科学基金;
关键词：
Eutectic high-entropy alloy; Tensile properties; Yield strength; Phase boundary strengthening; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; HIGH-DUCTILITY; MICROSTRUCTURE; BEHAVIOR; DESIGN; PLASTICITY; EVOLUTION; STRATEGY; FRACTURE;
D O I：
10.1016/j.msea.2023.144725
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Face-centered cubic (FCC)/ordered body-centered cubic (B2)-structured Al-Co-Cr-Fe-Ni system eutectic high -entropy alloys (EHEAs) have a favorable combination of high strength and ductility in the as-cast state. How-ever, the mechanical properties of this type of alloy vary significantly with composition. In this study, we attempted to determine the yield strength differences in FCC/B2 EHEAs. Based on reported Al0.8CrFeNi2.2, we successfully prepared three low-cost Co-free EHEAs: Al0.82Cr0.8Fe1.2Ni2.18, Al0.83Cr0.6Fe1.4Ni2.17, and Al0.85Cr0.4Fe1.6Ni2.15. All the EHEAs are shown to exhibit the same phase constituent (FCC/B2) and complete eutectic microstructure, with similar lamellar thickness but different tensile properties. We constructed a theo-retical calculation model based on the Hall-Petch regime which fits the measured yield strength & sigma;0.2. The yield differences for current FCC/B2 EHEAs results mainly from different intrinsic strengths of their soft FCC phases.
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页数：8
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