Effect of pre-strain on hydrogen embrittlement of 7075 aluminum alloy and molecular dynamics simulation

被引：3
作者：
Wang, Yuhao [1 ]
Liu, Jiyan [1 ]
Wang, Zhanrui [2 ]
Du, Fengshan [1 ]
机构：
[1] Yanshan Univ, Natl Engn Res Ctr Equipment & Technol Cold Strip R, Qinhuangdao 066004, Hebei, Peoples R China
[2] Yanshan Univ, Coll Mech Engn, Qinhuangdao 066004, Hebei, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2024年 / 88卷
基金：
中国国家自然科学基金;
关键词：
7075 aluminum alloy; Hydrogen embrittlement; Pre-strain; Molecular dynamics; Dislocation; INTERGRANULAR FAILURE; GRAIN-BOUNDARIES; BEHAVIOR; DISLOCATIONS; DEFORMATION; ENVIRONMENT; PRECIPITATION;
D O I：
10.1016/j.ijhydene.2024.08.496
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：
In this study, the effect of dislocation and grain boundary (GB) on hydrogen embrittlement of aluminum alloys was investigated using pre-strain and molecular dynamics (MD). Hydrogen increased the yield strength (YS) and ultimate tensile strength (UTS) of pre-strain alloys. MD simulations revealed that hydrogen enhance the critical resolved shear stress (CRSS) for dislocation, and hydrogen segregation GB reduce material strength. The YS and UTS of Al alloys are affected by both mechanisms during deformation, and the two mechanisms exhibit a competitive relationship. Hydrogen enhanced CRSS dominates in higher dislocation density deformations.
引用
收藏
页码：626 / 637
页数：12
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