Anomalous Strain Rate Sensitivity of Flow Stress in Ni3Ge Single Crystals. The role of Point Defects

Abstract

The paper considers the strain rate sensitivity of flow stress in Ni3Ge single crystals having high-energy antiphase boundaries detected in experiments for the strain rate variation. The concentration of point defects is estimated by the model of plastic deformation of alloys having L12 structure. These point defects generated by plastic deformation, annihilate both mutually and on dislocations. It is shown that at higher temperatures of deformation, the anomalous strain rate sensitivity of the flow stress observed during the strain rate variation, can be caused by the migration of and interaction between the point defects and dislocations.