OS0401 Analysis of deformation mechanism under ball indentation in magnesium single crystals

To understand deformation mechanisms of magnesium, ball indentation tests were carried on pure Mg and Mg-Al single crystals. In both crystals, indentation on (0001) was round shape, while indentation on (1210) was oval shape. Size of the indentation on (0001) was decreased by A1 addition, while the size on (1210) was similar in both crystals. Formation mechanism of the indentations was also analyzed by using MD simulation method. From these results, we conclude that the indentation on (0001) is made by activation of basal slip and pyramidal slip, and the indentation on (1210) is made by activation of basal slip and {1012} twin.