Rejuvenation of plasticity via deformation graining in magnesium

Bo-Yu Liu, Zhen Zhang (), Fei Liu, Nan Yang, Bin Li, Peng Chen, Yu Wang, Jin-Hua Peng, Ju Li (), En Ma () and Zhi-Wei Shan ()
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Bo-Yu Liu: Xi’an Jiaotong University
Zhen Zhang: Hefei University of Technology
Fei Liu: Xi’an Jiaotong University
Nan Yang: Xi’an Jiaotong University
Bin Li: University of Nevada
Peng Chen: Jilin University
Yu Wang: University of Science and Technology of China
Jin-Hua Peng: Jiangsu University of Science and Technology
Ju Li: Department of Nuclear Science and Engineering, Massachusetts Institute of Technology
En Ma: Xi’an Jiaotong University
Zhi-Wei Shan: Xi’an Jiaotong University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Magnesium, 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.

Date: 2022
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DOI: 10.1038/s41467-022-28688-9

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