Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting

被引：474
|
作者：
Zhu, Z. G. [1 ]
Nguyen, Q. B. [1 ]
Ng, F. L. [1 ]
An, X. H. [2 ]
Liao, X. Z. [2 ]
Liaw, P. K. [3 ]
Nai, S. M. L. [1 ]
Wei, J. [1 ]
机构：
[1] Singapore Inst Mfg Technol, 73 Nanyang Dr, Singapore 637662, Singapore
[2] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia
[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
来源：
SCRIPTA MATERIALIA | 2018年 / 154卷
基金：
澳大利亚研究理事会;
关键词：
Selective laser melting; High entropy alloys; Cellular structure; Mechanical property; Steady strain hardening; EVOLUTION; BEHAVIOR;
D O I：
10.1016/j.scriptamat.2018.05.015
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A near-fully dense CoCrFeNiMn high entropy alloy was additively manufactured by selective laser melting successfully. The as-built samples exhibit a hierarchical structure, including melt pools, columnar grains, sub-micron cellular structures, and dislocations. An outstanding combination of high strength and excellent ductility compared to those fabricated by conventional methods was achieved in the as-built samples. Quantitative analysis revealed that the cellular structures contribute significantly to the enhanced strength through dislocation hardening rather than cellular boundary strengthening. The excellent ductility is correlated with the steady strain hardening controlled by the sophisticated dislocation activities. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：20 / 24
页数：5
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