Abstract
Abstract Dislocation structures for the octahedral (111) slip system in Ni 3 (Al, Ti) single crystals deformed at temperatures above the yield stress peak were investigated as a function of temperature using TEM. As temperature increases, [101] edge dislocations become more predominant. Dislocations of screw character are in the almost complete Kear-Wilsdorf locked configuration while those of edge character are climb-dissociated on the (101) plane perpendicular to the (111) glide plane. It is suggested that the high-temperature deformation by the octahedral {111} slip in Ni 3 (Al, Ti) single crystals is controlled by the non-conservative motion of [101] edge dislocations connected with APB.
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