Transformation-Induced Creep Recovery of TiNi Shape Memory Alloy in Subloop Loading

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  • サブループにおけるTiNi形状記憶合金の変態誘起クリープ回復

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<p>The development and application of smart materials and structures have attracted worldwide attention. Shape memory alloy (SMA) has activated the research on smart materials and structures due to a unique characteristics of shape memory effect and superelasticity based on the martensitic and the reverse transformation. The TiNi SMAs are among the best SMAs since corrosion resistance is higher, the fatigue life is longer and cyclic deformation property is better than other SMAs. In this study, transformation-induced creep recovery (TICR) of TiNi SNA under constant stress in subloop is considered for the practical application. In particular, the behavior of a transformation band that appeared on specimen surface in TICR after loading until 8% strain followed by unloading to the strain of 6% was investigated. The TICR occurs due to small temperature change and reverse transformation band is generated after unloading followed by keeping constant stress, then the strain recovers to 1%.</p>

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