Metallic nanocrystals with low angle grain boundary for controllable plastic reversibility

Advanced nanodevices require reliable nanocomponents where mechanically-induced irreversible structural damage should be largely prevented. However, a practical methodology to improve the plastic reversibility of nanosized metals remains challenging. Here, we propose a grain boundary (GB) engineerin...

Full description

Saved in:
Bibliographic Details
Published in:Nature communications 2020-06, Vol.11 (1), p.3100-3100, Article 3100
Main Authors: Zhu, Qi, Huang, Qishan, Guang, Cao, An, Xianghai, Mao, Scott X., Yang, Wei, Zhang, Ze, Gao, Huajian, Zhou, Haofei, Wang, Jiangwei
Format: Article
Language:English
Subjects:
147/143
639/301/1023/303
639/301/357/537
639/301/930/328/2082
Bicrystals
Crystals
Damage accumulation
Damage prevention
Damage tolerance
Deformability
Deformation
FCC metals
Formability
Grain boundaries
Grain boundary migration
Humanities and Social Sciences
Metals
Misalignment
multidisciplinary
Nanocrystals
Nanomaterials
Nanotechnology
Nanotechnology devices
Plasticity
Plastics
Science
Science (multidisciplinary)
Stacking faults
Structural damage
Structural stability
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:Advanced nanodevices require reliable nanocomponents where mechanically-induced irreversible structural damage should be largely prevented. However, a practical methodology to improve the plastic reversibility of nanosized metals remains challenging. Here, we propose a grain boundary (GB) engineering protocol to realize controllable plastic reversibility in metallic nanocrystals. Both in situ nanomechanical testing and atomistic simulations demonstrate that custom-designed low-angle GBs with controlled misorientation can endow metallic bicrystals with endurable cyclic deformability via GB migration. Such fully reversible plasticity is predominantly governed by the conservative motion of Shockley partial dislocation pairs, which fundamentally suppress damage accumulation and preserve the structural stability. This reversible deformation is retained in a broad class of face-centred cubic metals with low stacking fault energies when tuning the GB structure, external geometry and loading conditions over a wide range. These findings shed light on practical advances in promoting cyclic deformability of metallic nanomaterials. Improving the reversible plastic deformability and damage tolerance of nanosized metals remains challenging. Here, the authors custom-design low angle grain boundaries in metallic bicrystals to achieve controllable plastic reversibility via fully conservative grain boundary migration.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-16869-3