Influence of hierarchical structure on deformation characteristics and mechanical response of nanotwinned copper

被引：3

作者：

Ding, Xiaoyang ^{[1
]}

Yang, Yong ^{[1
,2
]}

Cui, Tianhe ^{[1
]}

Zhang, Xinyu ^{[1
]}

Yang, Zailin ^{[1
,2
]}

机构：

[1] Harbin Engn Univ, Harbin, Peoples R China

[2] Harbin Engn Univ, Harbin, Peoples R China

来源：

MOLECULAR SIMULATION | 2023年 / 49卷 / 11期

关键词：

Hierarchical nanotwinned; twin boundary migration; mechanical response; molecular dynamics; MAXIMUM STRENGTH; TWIN BOUNDARIES; PLASTICITY; DYNAMICS;

D O I：

10.1080/08927022.2023.2222183

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：

The introduction of the hierarchical structure into face-centered cubic (FCC) nanotwinned (NT) metals can improve strength without losing plasticity. In present work, molecular dynamics (MD) simulations have been performed to investigate the effect of the hierarchical structure on NT copper under tensile and shear loading by comparing the differences between the hierarchical nanotwinned (HNT) and perfect nanotwinned (PNT) specimens. The results show that the hierarchical structure will alter the twin boundaries (TBs) migration mode under shear loading. The hardening process of HNT copper is dependent on the geometric structure of the grain boundary and loading direction. There is a stress gradient and additional hardening in HNT copper under tensile loading due to the hierarchical structure. This work may shed light on the role of hierarchical structure in the multiscale structure design of NT materials.

引用

页码：1157 / 1164

页数：8

共 37 条

[1] SELF-DIFFUSION AND IMPURITY DIFFUSION OF FCC METALS USING THE 5-FREQUENCY MODEL AND THE EMBEDDED ATOM METHOD [J].