Mechanical Properties of TiNi Shape Memory Alloy for Material and Spring

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  • TiNi形状記憶合金の材料およびばね特性
  • TiNi ケイジョウ キオク ゴウキン ノ ザイリョウ オヨビ バネ トクセイ

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Shape memory alloys receive wide attention as a functional material having an energy exchange function (thermal energy to mechanical energy). Applications of the alloy are actively developed and have already included some spring products.<br>Systematic studies of the alloy have been made in recent years, but very few reports on features of shape memory alloy springs are found.<br>This paper describes the investigation of the best fit heat treatment requirements for TiNi shape memory alloys and of their useful service range as a shape memory or a super elasticity material based on material and spring characteristics.<br>The result shows that the best fit heat treament temperature is 500°C because of the thermal hysteresis and the recovery force at the transformation point, the useful service range as a material is that the stress is not greater than 95kgf/mm2 and the temperature is the Ms point plus 115°C or less, and the useful service range as a spring is that the shear strain is 3.7-6.0% or less and the temperature is not higher than the Ms point plus 127°C.

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