粉末冶金プロセスを利用したTiNi形状記憶合金の傾斜機能化に関する研究

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  • Functionally Graded Properties of TiNi Shape Memory Alloy Fabricated by Powder Metallurgy Process

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<p>A TiNi shape memory alloy is a representative of the intelligent materials, and it is applied in the medical and the mechanical engineering fields, etc. In this study, in order to expand the field of application of the TiNi shape memory alloy, we propose a functionally-graded TiNi shape memory alloy. We focused on the composition dependency of the transformation temperatures and changed the transformation temperatures in the material in a stepwise manner by the powder metallurgy process. The Ni composition was changed by 0.3% from 49.8 at% to 51.0 at% in the longitudinal direction of the TiNi shape memory alloy. The material fabricated by the spark plasma sintering was subjected to hot and cold rolling processes and shape memory heat treatment. We confirmed that the sintered material subjected to hot and cold rolling has a functionally-graded property of the transformation temperatures, and the cold rolling has effect on narrowing the transformation temperature range. It means that the material can transform completely even in small temperature change. Furthermore, from the digital image correlation during a tensile test including a shape recovery process, we found that the material fabricated by both of the hot and the cold rolling partially shows the functionally-graded properties of the deformation properties.</p>

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