A promising CoFeNi2V0.5Mo0.2 high entropy alloy with exceptional ductility

被引：50
作者：
Jiang, L. [1 ]
Lu, Y. P. [2 ]
Song, M. [1 ]
Lu, C. [3 ]
Sun, K. [4 ]
Cao, Z. Q. [2 ]
Wang, T. M. [2 ]
Gao, F. [1 ,4 ]
Wang, L. M. [1 ,4 ]
机构：
[1] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA
[2] Dalian Univ Technol, Sch Mat Sci & Engn, Dalian 116024, Peoples R China
[3] Xi An Jiao Tong Univ, Dept Nucl Sci & Technol, Xian 710049, Shaanxi, Peoples R China
[4] Univ Michigan, Dept Mat Sci Engn, Ann Arbor, MI 48109 USA
来源：
SCRIPTA MATERIALIA | 2019年 / 165卷
基金：
中国国家自然科学基金;
关键词：
High entropy alloys; Strain hardening; High temperature properties; Synchrotron X-ray diffraction; Transmission electron microscopy; DISLOCATION SUBSTRUCTURE; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; BEHAVIOR; TRANSFORMATION; EVOLUTION; MICROSTRUCTURE; DIFFRACTION; STRENGTH; DESIGN;
D O I：
10.1016/j.scriptamat.2019.02.038
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A novel high entropy alloy with the composition of CoFeNi2V0.5Mo0.2, shows unusual strain hardening ability and an excellent combination of ductility and strength. Especially at 873 K, the elongation can reach 189.2%, almost three times that of the common high temperature alloys. Microstructural characterization suggests a coexistence of planar slip and cross slip. The resistance of planar slip serves to strengthen the alloy, while the cross slip effectively relieves strain concentration, substantially contributing to the uniform elongation. Also, the interaction of planar slip and cross slip will lead to the formation of two kinds of dislocation loops. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：128 / 133
页数：6
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