Dynamic recrystallization of pure zinc during high strain-rate compression at ambient temperature

Shiyang Liu; Damon Kent; Hongyi Zhan; Nghiem Doan; Matthew Dargusch; Gui Wang

doi:10.1016/j.msea.2020.139325

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Dynamic recrystallization of pure zinc during high strain-rate compression at ambient temperature

Journal article

Peer reviewed

Dynamic recrystallization of pure zinc during high strain-rate compression at ambient temperature

Shiyang Liu, Damon Kent, Hongyi Zhan, Nghiem Doan, Matthew Dargusch and Gui Wang

Materials Science & Engineering A, Vol.784, 139325

2020

DOI: https://doi.org/10.1016/j.msea.2020.139325

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Abstract

zinc

dynamic recrystallization

plasticity

Schmid factor

EBSD

Due to limited slip systems, forming of Zn-based alloys is typically conducted at elevated temperatures which consumes energy and may degrade mechanical properties. The present study aims to investigate feasibility for processing of Zn-based alloys at relatively low or even ambient temperatures by developing fundamental understanding that can be applied to control dynamic recrystallization during forming. An as-cast pure zinc was compressed to various strains at a strain rate of 0.5 s-1 under ambient temperature and the microstructures were studied by electron backscattered diffraction to gain insight into the microstructural evolution and dynamic recrystallization behaviours. Significantly, Zn remained intact up to very high true strains, above 161%, and the corresponding true stress-strain curve did not exhibit steady-state deformation behaviour. Extensive continuous and twin-induced dynamic recrystallization were revealed to effectively accommodate plastic strains and relieve local stress concentrations leading to this extraordinary plasticity. A strong dependence of basal slip and {101 ̅2} compression twinning on the grain orientation resulted in remnant coarse-grained domains in the otherwise heavily refined deformation microstructures. Strain partitioning at large strains is proposed to lead to continuous reductions in the true stress beyond the peak and bimodal texture in the final microstructure.

Details

Title: Dynamic recrystallization of pure zinc during high strain-rate compression at ambient temperature
Authors: Shiyang Liu (Author) - University of Queensland
Damon Kent (Author) - University of the Sunshine Coast - School of Science and Engineering
Hongyi Zhan (Author) - China Science Lab, General Motors Global Research & Development, China
Nghiem Doan (Author) - University of Queensland
Matthew Dargusch (Author) - University of Queensland
Gui Wang (Author) - University of Queensland
Publication details: Materials Science & Engineering A, Vol.784, 139325
Publisher: Elsevier BV
Date published: 2020
DOI: 10.1016/j.msea.2020.139325
ISSN: 0921-5093
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99451108902621
Output Type: Journal article

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Collaboration types: Industry collaboration; Domestic collaboration; International collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Nanoscience & Nanotechnology