Cu-Al-Ni形状記憶合金の疲労特性

概要

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A bending fatigue test in the region of the generation of the stress-induced martensite (β'_1 phase)has been carried out using the two types of single crystal specimens of a Cu-Al-Ni alloy which have the surface and longitudinal orientations of (001) [100] and (011) [100], respectively. In the early stage of the fatigue test, stripes which are associated with the microscopic surface unevenness caused by the multiplication of interfacial dislocations were found along the habit planes in the β_1-β'_1 stress-induced martensitic transformation. Fatigue cracks were initiated at the intersections of the stripes and grew along the {110} plane of the β_1 parent phase. By lattice correspondences this {110} plane of the β_1 parent phase was consistent with the {001} plane of the β'_1 martensitic phase. Consequently, fatigue crack initiation and growth occurred along the {001} cleavage plane within the stress-induced martensitic phase, these cracks grew and coalesced, finally resulting in failure.
1990-12-25