An important improvement of strength and ductility on a new type of CoCr2.5FeNi2TiW0.5 high entropy alloys under two different protective gases by selective laser melting

被引：22
作者：
Gu, Zhen [1 ,2 ]
Su, Xu [1 ]
Peng, Wenshan [2 ]
Guo, Weimin [2 ]
Xi, Shengqi [1 ,2 ]
Zhang, Xu [1 ]
Tu, Hong [1 ]
Gao, Yuan [1 ]
Wu, Hongjing [1 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[2] Luoyang Ship Mat Res Inst LSMRI, State Key Lab Marine Corros & Protect, Qingdao 266237, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 868卷
关键词：
High entropy alloys; Protective gases; Additive manufacturing; Microstructure and properties; MECHANICAL-PROPERTIES; MICROSTRUCTURE EVOLUTION; RAPID SOLIDIFICATION; THERMAL-STABILITY; GRAIN-REFINEMENT; COATINGS; RESISTANCE; DEFORMATION; COMPOSITE; CORROSION;
D O I：
10.1016/j.jallcom.2021.159088
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
High entropy alloys (HEAs) have excellent mechanical properties for wide application range and market demand. However, low ductility is a persistent problem with such alloys. With two different protective gases (Argon and Nitrogen), a new type of high entropy alloy CoCr2.5FeNi2TiW0.5 has been prepared by selective laser melting (SLM) technology for additive manufacturing with discussion and analysis on the influence of microstructure and mechanical properties in this paper. Under the protection of argon (Ar), the HEA forms a single-phase solid solution. Meanwhile, the second phase TiN is formed when nitrogen (N-2) is used as protective gas, which eventually becomes the matrix body-centered cubic (BCC) with precipitates TiN. The average microhardness values of samples under the protection of Ar and N-2 were 436.7HV and 499.2HV, respectively. Along the scanning direction, the SLM sample (N-2 protection) shows higher prop-erties on the average yield strength (YS), ultimate tensile strength (UTS), and average elongation of samples (581 MPa, 893 MPa, and 9.9%, respectively.), compared with those obtained under Ar atmosphere. This method could effectively refine grain structure and offer theoretical guidance to manufacture fine grain materials with high strength and ductility of new HEA components. (C) 2021 Elsevier B.V. All rights reserved.
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页数：11
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