TiNi形状記憶合金の繰返し変形特性 : マルテンサイト変態とR相変態に伴う形状記憶効果

概要

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By performing thermomechanical cycling tests on TiNi shape memory alloy, the cyclic properties of the shape memory effect (SME) due to the rhombohedral phase transformation (RPT) and the martensitic transformation (MT) were investigated. The main results are summarized as follows. ( 1 ) In the case of maximum strain in the RPT region, SME does not vary under cyclic deformation. ( 2 ) In the case of maximum strain in the MT region, the MT stress decreases and the MT reverse transformation temperature increases under cyclic deformation. The variation in these properties is large in the early cycles but decreases thereafter and increases markedly if maximum strain is in the MT completion region. ( 3 ) In the case of maximum strain in the MT region, two-way strain, due to RPT, develops under cyclic deformation. If cyclic deformation with maximum strain in the MT completion region is repeated five times, two-way strain of the same amount as that of the RPT strain caused by loading is obtained.
社団法人日本機械学会の論文
1995-12-25