<報文>Ni過剰TiNi合金の自発形状変化に及ぼす熱処理の影響

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In the specimen of Ti-51.5at%Ni and Ti-52at%Ni, the effects of constrained aging (773〜923K, 15min〜8hr) on spontaneous shape change during cooling were investigated. At the same time, transformation temperatures were measured by the electrical resistivity method. The relation between shape change and transformation temperatures was also studied. 1) Amount of shape change increases with decrease of aging time. 2) The shape in parent phase becomes similar to the constrained shape with increase of aging time. 3) In the case of 1hr aging, amount of shape change increases with decrease of aging temperature. Spontaneous shape change does not occur at 923K aging. 4) Spontaneous shape change during cooling starts at M's which is starting temperature of intermediate phase transformation. The amount of this shape change becomes nearly 80% of total shape change at Ms, which is starting temperature of martensitic transformation. This shape change finishes at Mf which is finishing temperature of martensitic transformation. 5) Transformaton temperatures of a constrained aging specimen are 20℃ higher than a non-constrained one.Ti-Ni AlloyShape Memory AlloyMartensitic TransformationTransformation TemperatureHeat-treatmentAgingTwo-way Shape MemoryAll-round Shape MemoryPrecipitate
東北大学の論文
1985-09-30