Significantly enhancing elevated-temperature strength and ductility of a FeMnCoCr high-entropy alloy via grain boundary engineering: Exploring multi-deformation mechanisms

被引：15
|
作者：
You, Z. Y. [1 ]
Tang, Z. Y. [1 ,2 ]
Chu, F. B. [1 ]
Ding, H. [1 ,2 ]
Misra, R. D. K. [3 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
[2] Northeastern Univ, Key Lab Lightweight Struct Mat, Shenyang 110819, Peoples R China
[3] Univ Texas El Paso, Ctr Struct & Funct Mat, Dept Met Mat & Biomed Engn, El Paso, TX USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 886卷
基金：
中国国家自然科学基金;
关键词：
High-entropy alloy; Grain boundary engineering; Grain boundary character distribution; High-temperature properties; RECRYSTALLIZATION BEHAVIOR; DYNAMIC RECRYSTALLIZATION; CHARACTER-DISTRIBUTION; CORROSION-RESISTANCE; HOT DEFORMATION; STEEL; MICROSTRUCTURE; EVOLUTION; TRANSFORMATION; FRACTURE;
D O I：
10.1016/j.msea.2023.145547
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The objective of the study is to elucidate the influence of grain boundary engineering (GBE) on the hightemperature properties of a metastable FeMnCoCr high-entropy alloy (HEA). Using thermo-mechanical processing (TMP), the grain boundary character distribution (GBCD) was optimized, which involved the increase of coincidence site lattice (CSL) special boundaries and multiple twinning events, and breaking of random highangle grain boundaries (RHAGBs) network. Furthermore, the deformation strain of the alloy became more uniform at high temperature, dynamic recrystallization was suppressed, and a number of deformation mechanisms were operative. The ductility of studied HEA was significantly enhanced by over 200% at 1073 K, resulting in a remarkable 1.35-fold increase.
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页数：8
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