Abstract
Core structures of a-screw dislocation in hcp metals have been investigated using molecular dynamics simulation. Lennard-Jones(LJ) type and Finnis-Sinclair(FS) type potentials were employed to obtain dislocation core structures. In the case of the LJ potential, a-screw dislocation has expanded core on the basal plane at 0 K. At higher temperature, the core width becomes narrow and expanded to the prismatic plane. Core structures of titanium, magnesium and beryllium were investigated at 300 K with FS potential. The core structures of titanium and magnesium were expanded on the prismatic and basal planes, respectively. These results correspond to the slip of the real metals behavior. The core structure of beryllium was expanded on the prism plane. This result was different from real metal slip behavior. The a-screw dislocation in titanium began to move at 0.009 strain in [\bar2110] tensile, and at 0.006 strain in [0\bar110] tensile.
