EFFECT OF Co ON THE TEMPERATURE DEPENDENCE OF YIELD STRESS IN Ni3Ge SINGLE CRYSTALS.

The effect of Co addition up to 1. 5 at% on the temperature dependence of yield stress in Ni//3Ge with L1//2 structure was investigated. Flow stress measurements were made on (Ni,Co)//3Ge single crystals with several different orientations. Slip systems were determined by two-surface trace analysis after compression at various temperatures between minus 196 and 600 degree C. Comparing the result of (Ni,Co)//3Ge with that of the binary Ni//3Ge, several conclusions were reached. One of them: the mechanical behavior of (Ni,Co)//3Ge is essentially the same as that of binary Ni//3Ge.