<報文>Ti-51at%Ni合金における全方位形状記憶効果の拘束時効による導出

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The ARSME is found to be obtained by constrained aging in Ti-51at% Ni alloy. ARSME belongs to reversible shape memory effect, so the spontaneous, reversible and repeatable shape change occurs according to heating and cooling, and the curvature of the specimen turns upside down between Af and Mf temperature. This paper represents the nature of ARSME, its optimum generating conditions, shape changes under applied stress and the electron microscopy of aging samples. The results are summarized as follows : 1) ARSME is associated with two-step transformation and strain fields between matrix and precipitations. 2) The two-step transformations appear by aging below 773K. 3) Optimum aging temperatures of ARSME are 773K and 673K. 4) The reversal of curvature does not take place by aging at 773K for more than 32.4ks. This phenomenon occurs in the case of aging at 673K for more than 3.6×10^2ks. 5) Shape changes with intermediate phase transformation have nearly perfect reversibility with thermal cycle. 6) On cooling, the opposite load at which the shape changes with intermediate phase transformations can be suppressed is about one half of that of reverse transformations on heating. 7) The morphology of intermediate and martensite phases coexisting with particles of the precipitate is very different from that of the single phase.
東北大学の論文
1983-03-22