Effect of Mg on dynamic recrystallization of Zn–Mg alloys during room-temperature compression
Author(s)
Liu, S
Zhan, H
Kent, D
Tan, Q
Yin, Y
Doan, N
Wang, C
Dargusch, M
Wang, G
Griffith University Author(s)
Year published
2021
Metadata
Show full item recordAbstract
This work reveals the role of Mg additions on deformation behaviours of Zn–Mg alloys during room temperature compression at moderately high strain rate of ∼0.5 s-1. Experimental results from scanning electron microscopy, transmission electron microscopy and electron backscatter diffraction provide insight into the deformation behaviours and dynamic recrystallization mechanisms operative in Zn-0.08%Mg and Zn-0.8%Mg alloys. The primary dynamic recrystallization mechanisms in the Zn-0.08%Mg alloy were continuous dynamic recrystallization in conjunction with twin-induced dynamic recrystallization. After straining to a true strain ...
View more >This work reveals the role of Mg additions on deformation behaviours of Zn–Mg alloys during room temperature compression at moderately high strain rate of ∼0.5 s-1. Experimental results from scanning electron microscopy, transmission electron microscopy and electron backscatter diffraction provide insight into the deformation behaviours and dynamic recrystallization mechanisms operative in Zn-0.08%Mg and Zn-0.8%Mg alloys. The primary dynamic recrystallization mechanisms in the Zn-0.08%Mg alloy were continuous dynamic recrystallization in conjunction with twin-induced dynamic recrystallization. After straining to a true strain of 161%, the Zn-0.08%Mg alloy displayed a uniform and heavily refined microstructure with an excellent combination of strength and plasticity. For the Zn-0.8%Mg alloy, particle-induced dynamic recrystallization activated by eutectic structures played a critical role in addition to continuous and twin-induced dynamic recrystallization mechanisms. Fine and soft-oriented grains which formed in proximity to the eutectic accommodated large amounts of localized plastic strain. This resulted in inhomogeneous strain partitioning which restricted dynamic recrystallization kinetics in hard-oriented grain interior regions due to insufficient slip activity to support continuous dynamic recrystallization. Therefore, a partially recrystallized microstructure was maintained in the Zn-0.8%Mg alloy up to true strain of 161%.
View less >
View more >This work reveals the role of Mg additions on deformation behaviours of Zn–Mg alloys during room temperature compression at moderately high strain rate of ∼0.5 s-1. Experimental results from scanning electron microscopy, transmission electron microscopy and electron backscatter diffraction provide insight into the deformation behaviours and dynamic recrystallization mechanisms operative in Zn-0.08%Mg and Zn-0.8%Mg alloys. The primary dynamic recrystallization mechanisms in the Zn-0.08%Mg alloy were continuous dynamic recrystallization in conjunction with twin-induced dynamic recrystallization. After straining to a true strain of 161%, the Zn-0.08%Mg alloy displayed a uniform and heavily refined microstructure with an excellent combination of strength and plasticity. For the Zn-0.8%Mg alloy, particle-induced dynamic recrystallization activated by eutectic structures played a critical role in addition to continuous and twin-induced dynamic recrystallization mechanisms. Fine and soft-oriented grains which formed in proximity to the eutectic accommodated large amounts of localized plastic strain. This resulted in inhomogeneous strain partitioning which restricted dynamic recrystallization kinetics in hard-oriented grain interior regions due to insufficient slip activity to support continuous dynamic recrystallization. Therefore, a partially recrystallized microstructure was maintained in the Zn-0.8%Mg alloy up to true strain of 161%.
View less >
Journal Title
Materials Science and Engineering A
Volume
830
Subject
Theory and design of materials