Deformation Behavior of Binary Mg-Y Alloy Under Dynamic Compression Loading

This study examines Mg-Y binary alloys at a high strain rate of approximately 1 9 10 3 s � 1 in compression by using a split Hopkinson pressure bar to elucidate the effect of yttrium in magnesium on mechanical anisotropy and other properties. As a result of high strain rate compression, Mg-0.6 at.%Y alloy showed less mechanical anisotropy, a lower strain hardening rate, and a larger compressive strain to failure of approximately 0.4, as compared with pure magnesium. Microstructure analysis by scanning electron microscopy/ electron backscatter diffraction revealed that the addition of yttrium could release the stress concentration at the interface between the matrix and the {10 � c-axis tension twins by the formation of subgrains and lattice rotation around the c-axis during dynamic compression.