On the interaction between slip dislocations and twins in HCP Zr

摘要: Abstract We investigate the effect of stored prismatic dislocations on onset and growth { 1 0 ¯ 2 } twins in pure Zr. A set temperature jump tests, some combined with a strain path changes, are performed here to exploit fact that slip-dominated plastic behavior occurs at room twin-dominated lower temperatures. In tests material is pre-strained various levels introduce slip dislocations, then reloaded liquid nitrogen. other nitrogen, different directions, generate either tensile or compressive twins, temperature. These interpreted recently developed dislocation-density based single crystal model order elucidate slip-twin interactions operating nanometer scale. Our analysis suggests (1) increase resistance for further twin propagation, but not propagation; (2) twinning insensitive amount dislocations; (3) substantial within oriented domains, which can decrease hardening rate by comparison one without twins.