Synthesis and microstructure characterization of Ni-Cr-Co-Ti-V-Al high entropy alloy coating on Ti-6Al-4V substrate by laser surface alloying

被引：77

作者：

Cai, Zhaobing ^{[1
]}

Jin, Guo ^{[1
]}

Cui, Xiufang ^{[1
]}

Liu, Zhe ^{[1
]}

Zheng, Wei ^{[1
]}

Li, Yang ^{[1
]}

Wang, Liquan ^{[2
]}

机构：

[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Inst Surface Interface Sci & Technol, Key Lab Superlight Mat & Surface Technol,Minist E, Harbin 150001, Peoples R China

[2] Harbin Engn Univ, Coll Mech & Elect Engn, Harbin 150001, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2016年 / 120卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Laser surface alloying; High entropy alloy coating; Microstructure; Focused ion beam; Thermodynamic; SOLID-SOLUTION PHASE; MECHANICAL-PROPERTIES; WEAR-RESISTANCE; CORROSION; EVOLUTION; BEHAVIOR; HARDNESS;

D O I：

10.1016/j.matchar.2016.09.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ni-Cr-Co-Ti-V-Al high-entropy alloy coating on Ti-6Al-4V was synthesized by laser surface alloying. The coating is composed of a B2 matrix and (Co, Ni)Ti-2 compounds with few beta-Ti phases. Focused ion beam technique was utilized to prepare TEM sample and TEM observations agree well with XRD and SEM results. The formation of HEA phases is due to high temperature and rapid cooling rate during laser surface alloying. The thermodynamic parameters, Delta H-mix, Delta S(mix)and delta as well as Delta chi should be used to predict the formation of the BCC solid solution, but they are not the strict criteria. Especially when Delta chi reaches a high value (>= 10%), BCC HEA will be partially decomposed, leading to the formation of (Co, Ni)Ti-2 compound phases. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：229 / 233

页数：5

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