Rejuvenation of plasticity via deformation graining in magnesium
Name
s41467-022-28688-9.pdf
Description
Published version
Size
4.68 MB
Format
Adobe PDF
Checksum (MD5)
45794f0247d24b4e1b4ac2f498f0a299
Author(s)
Liu, Bo-Yu
Zhang, Zhen
Liu, Fei
Yang, Nan
Li, Bin
Chen, Peng
Wang, Yu
Peng, Jin-Hua
Li, Ju
Ma, En
Date Issued
2022
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Liu, Bo-Yu, Zhang, Zhen, Liu, Fei, Yang, Nan, Li, Bin et al. 2022. "Rejuvenation of plasticity via deformation graining in magnesium." Nature Communications, 13 (1).
Version
Final published version
Abstract
AbstractMagnesium, the lightest structural metal, usually exhibits limited ambient plasticity when compressed along its crystallographic c-axis (the “hard” orientation of magnesium). Here we report large plasticity in c-axis compression of submicron magnesium single crystal achieved by a dual-stage deformation. We show that when the plastic flow gradually strain-hardens the magnesium crystal to gigapascal level, at which point dislocation mediated plasticity is nearly exhausted, the sample instantly pancakes without fracture, accompanying a conversion of the initial single crystal into multiple grains that roughly share a common rotation axis. Atomic-scale characterization, crystallographic analyses and molecular dynamics simulations indicate that the new grains can form via transformation of pyramidal to basal planes. We categorize this grain formation as “deformation graining”. The formation of new grains rejuvenates massive dislocation slip and deformation twinning to enable large plastic strains.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/S41467-022-28688-9
