Influence of solute hydrogen on the interaction of screw dislocations with vicinal twin boundaries in nickel

被引：20

作者：

Li, Jiaqing ^{[1
]}

Lu, Cheng ^{[1
]}

Pei, Linqing ^{[2
]}

Zhang, Che ^{[1
]}

Tieu, Kiet ^{[1
]}

机构：

[1] Univ Wollongong, Sch Mech Mat Mechatron & Biomed Engn, Wollongong, NSW 2522, Australia

[2] Chongqing Univ, Coll Mech Engn, Chongqing 400044, Peoples R China

来源：

SCRIPTA MATERIALIA | 2019年 / 173卷

基金：

中国国家自然科学基金;

关键词：

H embrittlement; Dislocation; Vicinal twin boundary; Molecular dynamics; GRAIN-BOUNDARIES; SLIP TRANSMISSION; DEFORMATION; FRACTURE; EMBRITTLEMENT; SEGREGATION; PROPAGATION; INSIGHTS; DEFECTS; FAILURE;

D O I：

10.1016/j.scriptamat.2019.08.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The influence of solute H on the interaction between screw dislocations and vicinal twin boundaries in Ni bicrystals is investigated using molecular dynamics (MD) simulations. Several interaction mechanisms such as dislocation transmission, nucleation and reflection are reported for different glide planes and grain boundary (GB) structures. The presence of H tends to transform these interactions into ones involving dislocation absorption. This disorders the atomic structure of GBs and establishes a local stress state, which promotes the ultimate failure of GBs due to the formation of vacancies. These findings will deepen our understanding on the experimentally-observed H embrittlement in metallic materials. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：115 / 119

页数：5

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