衝撃引張変形下におけるFe-28Mn-6Si-5Cr形状記憶合金に生じる応力誘起マルテンサイト変態の体積抵抗率測定による評価

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  • An Estimation of Stress-induced Martensitic Transformation in Fe-28Mn-6Si-5Cr Shape Memory Alloy by Measurement of Volume Resistivity During Impact Tensile Deformation

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<p>Because Fe-based shape memory alloy (Fe-SMA), is attempted to be applied to many engineering fields under different working environment loaded at various strain rates, it is necessary to evaluate stress-induced martensitic transformation which can control such excellent performances, at various strain rate. In this study, tensile tests of Fe-28Mn-6Si-5Cr alloy, which is one of Fe-SMA, are conducted under impact deformation. During impact deformation, it is attempted to evaluate the stress-induced martensitic transformation by measuring the volume resistivity as well as temperature for increasing a reliability of the alloy. The volume resistivity and temperature in the Fe-SMA is estimated experimentally by using the past-established circuit based on the Kelvin double bridge with a higher precision and an extremely-thin thermocouple as well as a laser Doppler vibrometer during impact tensile tests.</p>

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