ニッケルチタン形状記憶合金短時間形状記憶処理材の機械的性質

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  • Mechanical properties of a nickel titanium shape memory alloy with short time aging

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<p>Functional fatigue in shape memory alloy is known as the degradation of superelasticity after the repetition for large number of cycles, which would result in the accumulation of residual strain. Present study found that cold-drawn wires of Titanium 50.6 at.% Ni alloy exhibit superelasticity even after the heat treatment for a few seconds at 500℃. We shall call this flash heating “short time aging”. It was also found that the short time aged sample showed smaller amount of residual strain in function fatigue. The amount of residual strain decreased with decreasing the period of aging. The stress-strain curves of superelasticity in specimens with different aging time were compared.</p>

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