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

• Published in: Vacuum Vol. 231; p. 113804
• Main Authors: Cao, G.H., Wang, H., Qiu, C., Meng, F.S., Deng, Z.J., Zhang, D.T., Chen, D.L.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2025
• Subjects: Low-cycle fatigue; Mg-Zn-Ca alloy; Microstructure; Quasi-in-situ EBSD; Quasi-in-situ EBSD; Mg-Zn-Ca alloy; Microstructure; Low-cycle fatigue
• ISSN: 0042-207X
• DOI: 10.1016/j.vacuum.2024.113804

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 <c+a> 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.