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Abstract
It is important to clarify deformation mechanisms, such as slip and twin, for understanding deformation behavior of crystalline materials. In hcp metals, there are many deformation mechanisms related to the crystal structure. In this study, magnesium single crystals were s stretched in [112^^-0] and compressed in [0001] in various directions in the range of 77K to 573K to investigate the deformation behavior by non-basal slips and twins. In both case, {112^^-2} <<11>^^^-23> second order pyramidal slip is activated in all magnesium and magnesium alloy single crystals, and its yield stress shows anomalous temperature dependence in the range from 77K to 293K, however, the yields stress decreased rapidly with increasing temperature over 293K. In [112^^-0] compression and [0001] tensile test, {101^^-2} twin occurred at 5-10MPa in both case. These results indicate that deformation behavior of magnesium single crystal strongly depends on the loading orientation.
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