DISLOCATION MORPHOLOGY, STRUCTURE AND DENSITY ON (001) SLIP PLANE IN NI-3(AL,TI) SINGLE-CRYSTALS DEFORMED AT ELEVATED-TEMPERATURES

Ni3Al single crystals with the L1(2) structure and with a [123] orientation with respect to the stress axis were deformed by compression at temperatures above T-p, the yield stress peak temperature, so that (001) cube slip dislocations were introduced. The dislocation morphology, configuration and density on (001) slip planes were examined as functions of the deformation temperature, strain rate and strain by transmission electron microscopy. It was found that dislocations on the cube plane were predominantly of edge character and that within the range studied the dislocation density was largely independent of the deformation temperature, strain rate and strain.