繰返し変形に伴う形状記憶特性の変化 : Ni-Ti合金の応用・設計のために

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In order to obtain the fundamental data for application and design of shape memory alloy (SMA), the changes in characteristics of shape memory effect (SME) and reversible shape memory effect (RSM) with deformation cycles were investigated for Ni-Ti alloy. Though the following each phenomenon had been reported previously, the quantitative results obtained in the present study are summarized as follows; (1) SME and RSM changed greatly at initial deformation cycles. (2) The degradation of SME and the appearance of RSM became progressively greater with increasing deformation. (3) The relation between the appearance of RSM and the degradation of SME against deformation cycles was linear. This relation indicates that 1% degradation of SME generates 1.56% of RSM. (4) By the utilization of SME and RSM, it seems possible to start the reciprocating movement by applying thermal cycles. But, in order to obtain the desirable movement, it is necessary to have more detailed knowledges about the changes of sample shape memory and deformation. (5) All the transformation temperatures (M_s and M_f are the start the and finish temperatures of martensite transformation , and A_s and A_f are those of reverse tranformation) changed linearly with the degree of deformation. With increasing deformation, the values of A_f and M_s increased, while A_s and M_f decreased. These results indicate that the thermal cycles with a large temperature difference are required to achieve the perfect reciprocating movement. This paper also suggests the notion for utilization of SMA, sharpe design and characteristic property of Ni-Ti alloy.
社団法人日本材料学会の論文
1985-07-15

繰返し変形に伴う形状記憶特性の変化 : Ni-Ti合金の応用・設計のために

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