Strengthening-softening transition in yield strength of nanotwinned Cu

It is known that the strength of nanotwinned copper increases with decreasing twin thickness, reaches a maximum at twin thickness of 15 nm, and then decreases with twin thickness down to 4 nm. To understand this behavior, critical resolved shear stresses of various slip modes in nanotwinned copper a...

Full description

Saved in:
Bibliographic Details
Published in:Scripta materialia 2019-03, Vol.162, p.372-376
Main Authors: Xiao, Jianwei, Yang, Huizhen, Liu, Hexiong, Younus, Fatima, Xu, Bo, Zhang, Xiangyi, Wang, Yanbin, Wen, Bin
Format: Article
Language:English
Subjects:
Dislocation
Molecular dynamics
Nanotwins
Yield strength
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:It is known that the strength of nanotwinned copper increases with decreasing twin thickness, reaches a maximum at twin thickness of 15 nm, and then decreases with twin thickness down to 4 nm. To understand this behavior, critical resolved shear stresses of various slip modes in nanotwinned copper are investigated using molecular dynamics simulations. Based on the Sachs polycrystalline model, twin thickness dependent yield strengths are deduced that are in good agreement with experimental data. The strengthening-softening behavior is attributed to a transition from partial dislocations slipping in twin boundaries to detwinning induced by incoherent twin boundary migration. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.11.049