強加工熱処理によるNiTi形状記憶合金の形状回復量の増加について

抄録

NiTi shape memory alloys exhibit both shape memory effect and superelasticity. In general, the shape memory capacity of commercial products supplied as drawing wires is known to be limited below 7% strain. In order to get a larger shape memory strain than that, additional cold working through drawing with dices and a medium temperature annealing were applied. It might cause the work hardening and the re-orientation of grains into the favorable <111> direction along the tensile axis. As a result, we obtained the shape memory and superelastic strains of about 9%.