Effects of cold-rolling and subsequent annealing on the nano-mechanical and creep behaviors of CrCoNi medium-entropy alloy

被引：18
|
作者：
Sun, Shuo [1 ,2 ]
Zai, Wei [3 ]
Chen, Yan [1 ,2 ]
Zhao, Liang [1 ,2 ]
Sun, Guixun [1 ,2 ]
Hu, Jiangjiang [4 ]
Han, Shuang [1 ,2 ]
Lian, Jianshe [1 ,2 ]
机构：
[1] Jilin Univ, Key Lab Automobile Mat, Minist Educ, Changchun 130025, Peoples R China
[2] Jilin Univ, Coll Mat Sci & Engn, Changchun 130025, Peoples R China
[3] Xian Rare Met Mat Inst Co Ltd, Xian 710016, Peoples R China
[4] Zhejiang Univ Technol, Coll Mech Engn, Hangzhou 310014, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 839卷
基金：
中国国家自然科学基金;
关键词：
Medium-entropy alloy; Cold-rolling; Annealing; Nanoindentation; Strengthening mechanisms; Creep; ROOM-TEMPERATURE CREEP; GRAIN-SIZE DEPENDENCE; ULTRA-HIGH STRENGTH; POWER-LAW CREEP; NANOINDENTATION CREEP; DISLOCATION DENSITY; SINGLE-CRYSTALLINE; UNIAXIAL CREEP; STRAIN-RATE; DEFORMATION;
D O I：
10.1016/j.msea.2022.142802
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The influences of thermomechanical treatment on the microstructural evolution and nano-mechanical behaviors of CrCoNi medium-entropy alloy (MEA) were systematically studied through a series of nanoindentation experiments. Cold-rolling induced substantial grain refinement and during subsequent annealing, the CrCoNi MEA exhibited a highly temperature-dependent recrystallized microstructure characterized by significant variations in grain size, dislocation density, and twin fraction with increasing annealing temperature. The hardness of the cold-rolled sample increased with annealing temperature, reaching its highest value at 600 degrees C and then decreasing gradually. Annealing was also found to influence the creep behaviors of the CrCoNi MEAs. A cold rolled sample annealed at 700 degrees C exhibited the highest resistance to creep. The results of a detailed microstructure examination, calculations, and theoretical analysis revealed that annealing twins play a key role in increasing both the strength and the creep resistance of the CrCoNi MEAs. Short-range order clusters also contributed to the strength and creep resistance.
引用
收藏
页数：12
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