Tension-compression asymmetry of pseudoelasticity in Fe-23.0 at. percent Al single crystals

摘要

Tension-compression asymmetry of pseudoelasticity in Fe-23.0at. percentA1 single crystals with the D0_3 structure was quantitatively examined by analyzing stress-strain response during tension-compression loading. The crystals demonstrated large pseudoelasticity associated with to-and-fro motion of 1/4(111} superpartial dislocations dragging antiphase boundaries. Pseudoelasticity based on {101} slip showed little tension-compression asymmetry while an activation of {211} slip resulted in the asymmetry depending on the moving direction of 1/4(111) superpartials with a screw character during loading and unloading.