Enhanced resistance to hydrogen embrittlement in a CrCoNi-based medium-entropy alloy via grain-boundary decoration of boron

被引：23
作者：
Chen, X. H. [1 ]
Zhuang, X. Q. [1 ]
Mo, J. W. [1 ]
He, J. Y. [2 ]
Yang, T. [3 ]
Zhou, X. Y. [4 ]
Liu, W. H. [1 ]
机构：
[1] Harbin Inst Technol Shenzhen, Sch Mat Sci & Engn, Shenzhen, Peoples R China
[2] Cent South Univ, State Key Lab Powder Met, Changsha, Peoples R China
[3] City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China
[4] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany
来源：
MATERIALS RESEARCH LETTERS | 2022年 / 10卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Medium entropy alloy; hydrogen embrittlement; grain boundary segregation; INTERGRANULAR FRACTURE; NICKEL; DEFORMATION; SEGREGATION; PHOSPHORUS; CARBON;
D O I：
10.1080/21663831.2022.2033865
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We found boron doping can substantially reduce the ductility-loss in the CrCoNi medium-entropy alloy after gas-hydrogen charging, from similar to 71% to similar to 46%, while the fracture mode transfers from predominantly intergranular to ductile transgranular dominated. The two alloys have no difference in phase-structures (single face-center-cubic), grain sizes, and grain-boundary (GB) characters. However, atom probe tomography identified apparent GB decoration of boron up to 1.5 at.% and nanometer-scaled scattered borides in boron-doped CrCoNi. Such local chemical difference leads to enhanced GB cohesion and reduced hydrogen diffusivity along GBs, resulting in improved immunity against hydrogen-embrittlement and suppressed mechanical degradation in the boron-doped CrCoNi alloy. IMPACT STATEMENT We found grain-boundary decoration of boron can substantially enhanced resistance to hydrogen embrittlement in a CrCoNi-based medium-entropy alloy when exposing to high-pressure gas-hydrogen charging.
引用
收藏
页码：278 / 286
页数：9
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