<報文>Ti-50.8at%Ni合金の形状記憶特性に及ぼす曲げ歪および熱処理の影響

概要

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The experiments were carried out to clarify the effects of the bending strain and the aging treatments on the characteristic of the spontaneous shape change of Ti-50. 8at%Ni alloy which exhibits all-round shape memory effect. The results are as follows. 1) The spontaneous shape changes appear by two stages on cooling and by one stage on heating, respectively. The hysteresis is hardly observed on the first stage of shape change. 2) From the results of the experiment in which the constrained strain on bending is in the range from 1 to 9.1%, the most shape change appears in the case of ε=1%. 3) The specimen which aged at 350℃ for 0.5hr after solid solution treatment exhibits the excess shape memory effect below 20℃. 4) The specimen aged at 400 to 500℃ after solid solution treatment exhibits excellent shape inverse. The best conditions to make all-round shape memory are the aging at 450℃ for 10hr under the bending strain of 1%. 5) The start temperature of the spontaneous shape change on cooling decreases drastically on aging above 450℃. 6) The maximum allowable strain in tension for the solid solution treated alloy was 4% because of its reduced ductility. 7) Recovery stress of the alloy was always proportional to the recovery strain.Ti-Ni alloyshape memory alloymartensitic transformationtransformation temperatureheat-treatmentagingtwo-way shape memoryall-round shape memory
東北大学の論文
1987-03-10