Abstract
A single crystal of a Ti-51Ni (at%) alloy was grown by floating zone method, and Ti 3 Ni 4 precipitates of a single variant were formed coherently to the matrix by aging treatment under a compressive stress applied along the [111 ] direction. By using this single crystal, two-way (all-round) shape memory property was investigated. The precipitates were lenticular in shape with 30 nm in thickness and 250 nm in diameter, and their volume fraction was about 9% The matrix was expanded elastically about 0.2% on average along the [111] direction. The elastic energy accumulated in the matrix was estimated to be about 0.3 MJ/m 3 ; it was about 1.5% of the latent heat of the B2 → R transformation. The thermally induced R-phase was composed of a single variant, and the spontaneous strain along the [111] direction was about 0.8% of expansion. The maximum work we could gain from the spontaneous shape change was estimated to be about 0.17 MJ/m 3 .
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