OS2112 TiNi形状記憶合金のサブループ変形挙動(OS21-3 形状記憶材料の機能特性,OS-21 形状記憶材料の開発,機能特性および応用)

概要

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The subloop behavior for the superelastic deformation of TiNi shape memory alloy was investigated based on the local temperature variation and the surface observation in the tension test. The results obtained are summarized as bellows. (1) The upper and lower stress plateaus during loading and unloading appear accompanying the progress and reduction of the martensitic transformation (MT) band, respectively. In the case of unloading from the upper stress plateau under low stress rate, strain increases in the initial stage of unloading. (2) If stress is held constant in the upper stress plateau, creep deformation appears. The creep deformation appears based on the progress of the MT band. The volume fraction of the martensitic phase increases in proportion to an increase in strain.
一般社団法人日本機械学会の論文
2011-07-16