S0303-2-2 Ti-Ni-Cu形状記憶合金の二方向性ひずみ発現に及ぼす予ひずみおよび熱処理の影響(形状記憶合金の特性と応用展開(2))

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This study describes the effects of pre-deforming and heat-treatment on two-way shape memory properties of Ti-Ni-Cu alloy. The chemical composition of specimen is Ti-41.7Ni-8.5Cu (at%). Experiments were conducted under thermomechanical cyclic conditions. The specimen was loaded to given applied strain and subsequently unloaded. And then, under constrained strain condition, the specimen was heated to 423K and kept 0.6ks followed by unloading and cooling under strain-free condition. The number of cycle is 30. The plastic strain increases with the number of cycles up to approximately 15 cycles but become almost constant after 15 cycles. The two-way shape memory strain increases with increasing plastic strain, and reaches approximately 2% at the time of approximately 3% plastic strain. However, the two-way shape memory strain decreases with increasing plastic strain more than 3%. Moreover, the two-way shape memory strain increases with increasing volume fraction of slip-deformation martensite, and it is saturated by 10% of volume fraction of slip-deformation martensite.
2009-09-12