The pseudo-elastic behaviour of Fe-23.8at%Ga single crystals compressed with different loading axes at room temperature was examined focusing on the activated deformation mode. In the crystals, {101}<111> slip and {211}<111> twin were mainly activated depending on the loading axis. Pseudoelastic behaviour of the crystals depended strongly on the deformation mode. If {101}<111> slip was operative, sole and paired ¼<111> superpartial dislocations moved dragging antiphase boundaries. During unloading, the antiphase boundary pulled back the superpartials due to its tension resulting in pseudoelasticity. In contrast, twinning and untwinning of {211}<111> pseudo-twins also led to large strain recovery accompanying a serrated flow during loading and unloading. It was suggested the energy of the pseudo-twin interface was the driving force for the twinning pseudo-elasticity.

Unusual Pseudoelastic Behaviour of Fe3Ga Shape Memory Alloys. H.Y.Yasuda, M.Aoki, Y.Oda, K.Fukushima, Y.Umakoshi: Journal of Physics - Conference Series, 2009, 165[1], 012053