S0303-2-1 Ti-Ni-Cu形状記憶合金の予ひずみ付与後の変態・変形挙動におよぼす熱処理条件の影響(形状記憶合金の特性と応用展開(2))

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In order to improve the performance of actuator using shape memory alloy, we studied the effect of aging-treatment on transformation temperature difference and temperature hysteresis of Ti-Ni-Cu shape memory alloy. The chemical composition of specimen is Ti-41.7Ni-8.5Cu (at%) and cold working ratio (CW) is 10% and 40%. Aging temperature was 673K, and aging time was varied from 3.6ks to 1800ks. In the case of CW=10%, the transformation temperatures have a little dependence on aging time. However, in the case of CW=40%, though A_f and M_s have a little dependence on aging time, A_s and M_f increase with increasing of aging time. This difference is caused by the decrease of dislocation density with increasing aging time and the difference of sensitivity of dislocation of each transformation temperature. Moreover, the temperature response (A_f-A_s) is increase with increasing CW, but decrease with increasing aging time.
社団法人日本機械学会の論文
2009-09-12