Ni-Ti-Nb形状記憶合金の変形および変形回復特性に関する基礎的研究

概要

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Fundamental deformation and deformation-recovery behaviors of Ni-Ti-Nb shape memory alloy were experimentally investigated, especially their dependency on test temperature. Monotonic tension tests and deformation-recovery tests were conducted at low and high temperatures ranging from 253K to 473K. Stress-strain response above 323K is quite different from that below the temperature. The yield stress shows the positive temperature-dependency below 323K and the opposite trend is observed above this temperature. From this result, it is estimated that the dominant mechanism of inelastic deformation is the plastic deformation above 323 K and the pseudo-elastic one below it. The temperature at which strain recovery starts strongly depends on the maximum prestrain and prestraining temperature. Residual strain is always observed in the deformation recovery tests. Also it was found that the larger recovery strain can be obtained for the larger prestrain and at the lower prestraining temperature.
一般社団法人日本機械学会の論文
1999-08-25