Stacking faults and the gamma-surface on first-order pyramidal planes in alpha-titanium

摘要

Using first principles methods, we calculated the entire gamma-surface of the first-order pyramidal planes in alpha-titanium. Slip on these planes involving dislocations with c + a-type Burgers vectors is one means by which alpha-titanium polycrystals may supplement slip on prism planes with a-type Burgers vectors to maintain ductility. We find one low energy and one high energy stacking fault with energies of 163 and 681 mJ/m(2), respectively. Contrary to previous suggestions, we do not find a stable stable stacking fault at (c + a)/2.