The temperature dependence of the yield stress of Ni3Ge single crystals was investigated. A positive temperature dependence of the critical yield stress in the high-temperature region (above 420K) was attributed to thermally activated accumulation of a high non-screw super-dislocation density. The mechanism of interaction of point defects with super-dislocations and its contribution to the temperature anomaly was examined. A correlation was found between the calculated contribution from point defects and the observed increase in the critical yield stress with the test temperature.

Thermally Activated Glide of Edge Superdislocations in a Single-Crystalline Ni3Ge Alloy with Point Defects. Y.A.Abzaev, V.A.Starenchenko, È.V.Kozlov: Russian Physics Journal, 2007, 50[4], 394-9