Superior cryogenic tensile properties of ultrafine-grained CoCrNi medium-entropy alloy produced by high-pressure torsion and annealing

被引：129
作者：
Sathiyamoorthi, Praveen [1 ,2 ]
Moon, Jongun [1 ,2 ]
Bae, Jae Wung [1 ,2 ]
Asghari-Rad, Peyman [1 ,2 ]
Kim, Hyoung Seop [1 ,2 ,3 ,4 ]
机构：
[1] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 37673, South Korea
[2] Pohang Univ Sci & Technol POSTECH, Ctr High Entropy Alloys, Pohang 37673, South Korea
[3] Pohang Univ Sci & Technol POSTECH, GIFT, Pohang 37673, South Korea
[4] Yonsei Univ, Dept Mat Sci & Engn, Seoul 03722, South Korea
来源：
SCRIPTA MATERIALIA | 2019年 / 163卷
基金：
新加坡国家研究基金会;
关键词：
Ultrafine-grain; Cryogenic tensile strength; Nanotwins; CoCrNi alloy; High-pressure torsion; TEMPERATURE-DEPENDENCE; DEFORMATION; STRENGTH; STRESS; MECHANISM; DUCTILITY; BEHAVIOR; SIZE;
D O I：
10.1016/j.scriptamat.2019.01.016
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ultrafine-grained materials with nanotwins are expected to produce a remarkable combination of strength and ductility. In the present study, ultrafine-grained CoCrNi medium-entropy alloy with nanotwins is fabricated by high-pressure torsion followed by annealing; and investigated for cryogenic tensile properties. The alloy exhibits superior cryogenic tensile properties with a tensile strength of similar to 2 GPa and tensile strain of similar to 27%. The cryogenic tensile strength of ultrafine-grained sample increased by 67% as compared to the cryogenic tensile strength of coarse-grained sample due to fine grain size, annealing nanotwins, residual dislocation density, and strong temperature dependence of yield strength. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：152 / 156
页数：5
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