The plastic deformation of single crystals under confining pressures was investigated at temperatures ranging from 500 to 77K. Slip-line and transmission electron microscopic observations indicated that, at low temperatures, deformation was controlled by the glide of ½<10¯1> screw dislocations which cross-slipped from the {111} glide plane. The critical resolved shear stress at temperatures above 420K depended strongly upon the temperature. At temperatures below 400K, the temperature dependence was weak and this produced a hump (at 420K) in the critical resolved shear stress versus temperature plot.

T.Suzuki, T.Nishisako, T.Taru, T.Yasutomi: Philosophical Magazine Letters, 1998, 77[4], 173-80