Parameters of Dislocation Structure and Work Hardening of Ni 3 Ge

Orientation dependence of the yield stress temperature anomaly in Ni 3 Ge single crystals with the L1 2 structure was investigated during compression tests. The measurements were carried out in the 4.2 K-1000 K temperature interval for two orientations of single crystals, [001] and [ 2 34]. The dislocation structure was studied by TEM. Quantitative measurements of different parameters of dislocation structure were carried out. The values of the scalar dislocation density, ρ, were determined for different temperatures in the deformation interval from the yield stress up to fracture. Temperature dependence of the friction stress τ F ( T ) and the interdislocation interaction parameter α( T ) were also obtained. The change in the fraction of straight dislocations as a function of temperature was analyzed.