Effects of Dislocation and Microstructure on Pseudoelasticity in D0_3-Type Fe_3Al Single Crystals

摘要

New type pseudoelasticity in Fe_3Al with the D0_3 structure was examined using the single crystals. The pseudoelasticity occurred due to a reversible motion of 1/4<111> superpartials dragging the nearest-neighbor anti-phase boundaries. The chemical composition and microstructure of Fe_3Al alloys strongly influenced the shape recovery ratio and Fe-23.0at%Al alloy with fine domain structure was the most favorable for the appearance of the pseudoelasticity. The recovery ratio of Fe-23.0at%Al exceeded 80 % in the wide temperature range from-50 to 200°C.