Tensile experiments were performed on a rolled AZ31 alloy in an SEM at 323K (50°C), 423K (150°C), and 523K (250°C) in order to analyze the deformation mechanisms in-situ. Electron backscatter diffraction (EBSD) was performed both before and after deformation. The mechanical anisotropy was considerably reduced with temperature. Extension twinning was observed at 323K (50°C), but disappeared at 423K (150°C), indicating that the CRSS of non-basal systems becomes smaller than that of twinning at T<423K (150°C). From 423K (150°C) to 523K (250°C), a transition occurred in the dominant deformation mode from basal + prismatic <a> to mainly prismatic <a> slip. This is consistent with a decrease of the CRSS of non-basal slip systems with increasing temperature. In-situ tensile-creep experiments, performed at approximately the yield stress at 423K (150°C), indicated less slip and more grain boundary cracking occurs under creep deformation as compared to the higher-stress tensile experiments.
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Chen, Z., Boehlert, C., Gutiérrez-Urrutia, I., Llorca, J., Pérez-Prado, M.T. (2012). Tensile and Creep Deformation Mechanisms in Rolled AZ31. In: Mathaudhu, S.N., Sillekens, W.H., Neelameggham, N.R., Hort, N. (eds) Magnesium Technology 2012. Springer, Cham. https://doi.org/10.1007/978-3-319-48203-3_19
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