Deformation Behavior of Magnesium Single Crystal in c-axis Compression and a-axis Tension

In general, deformation behavior of magnesium in compression is different from tensile. To investigate deformation behavior of magnesium single crystals by non-basal slips and twins, c-axis compression and a-axis tension tests were performed in the range of 77K-573K. The crystals were yielded by second order pyramidal slip, and the yield stress shows anomalous temperature dependence (increased with increasing temperature) between 203K and 293K. Yield stress of c-axis compression was bigger than that of a-axis tensile. In compression, fracture surface were (11 (2) over bar4) under 293K and were {30 (3) over bar4} above 373K, and fracture strain was smaller than the case of tension test. {10 (1) over bar1}-{10 (1) over bar2} double twin were activated at higher temperature and the crystal, therefore, fractured along the twin interface.