Effect of Mo doping on the gaseous hydrogen embrittlement of a CoCrNi medium-entropy alloy

被引：38
|
作者：
Yi, Jiang [1 ]
Zhuang, Xiaoqiang [2 ]
He, Jing [1 ]
He, Minglin [1 ]
Liu, Weihong [2 ]
Wang, Shuai [1 ]
机构：
[1] Southern Univ Sci & Technol, Dept Mech & Energy Engn, 1088 Xueyuan Ave, Shenzhen 518055, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Shenzhen, Peoples R China
来源：
CORROSION SCIENCE | 2021年 / 189卷
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Hydrogen embrittlement; Medium-entropy alloy; Microstructure; Deformation; CoCrNi; GRAIN; DEFORMATION; MICROSTRUCTURE; INTERFACES; BOUNDARIES; TRANSPORT; EVOLUTION; STRESS;
D O I：
10.1016/j.corsci.2021.109628
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
By using slow-strain-rate tensile test and post-mortem characterization of microstructure and fractography, we found that Mo-doping can simultaneously improve the strength and hydrogen resistance of an equi-molar CoCrNi medium-entropy alloy. At a high hydrogen concentration of 55.51 mass ppm, CoCrNi exhibited brittle intergranular fracture. By contrast, (CoCrNi)97Mo3 possessed a mixed fracture morphology with lots of dimples and a small portion of intergranular feature. We attributed the enhanced hydrogen resistance to the Mo-promoted twinning-dominated deformation process, which can suppress the redistribution of hydrogen concentration by dislocation motion, and thus inhibit the hydrogen-induced grain boundary decohesion.
引用
收藏
页数：9
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