Quasi-in-situ observations of microstructural evolution during cyclic deformation of a Mg-Zn-Ca alloy

Quasi-in-situ electron backscatter diffraction (EBSD) was employed to investigate the microstructural evolution of a homogenized coarse-grained Mg-1.2Zn-0.1Ca alloy during cyclic deformation at a strain amplitude of 0.8 %. The random orientations of grains along with the soft state of the alloy resu...

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Bibliographic Details
Published in:Vacuum 2025-01, Vol.231, p.113804, Article 113804
Main Authors: Cao, G.H., Wang, H., Qiu, C., Meng, F.S., Deng, Z.J., Zhang, D.T., Chen, D.L.
Format: Article
Language:English
Subjects:
Low-cycle fatigue
Mg-Zn-Ca alloy
Microstructure
Quasi-in-situ EBSD
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Summary:Quasi-in-situ electron backscatter diffraction (EBSD) was employed to investigate the microstructural evolution of a homogenized coarse-grained Mg-1.2Zn-0.1Ca alloy during cyclic deformation at a strain amplitude of 0.8 %. The random orientations of grains along with the soft state of the alloy resulted in symmetrical hysteresis loops and cyclic hardening. Besides the occurrence of twinning-detwinning, basal /pyramidal II and pyramidal I slip systems were primarily activated. Grain boundaries with a higher misorientation angle of >35° served as preferential sites for strain localization. •Quasi-in-situ EBSD was used to investigate the cyclic deformation of a Mg-1.2Zn-0.1Ca alloy.•In-grain misorientation axes analysis was applied to determine the deformation modes.•Grain boundaries with a misorientation of >35° serve as preferential sites for strain localization.
ISSN:0042-207X
DOI:10.1016/j.vacuum.2024.113804