1807 相変態と形状記憶効果に関する分子動力学的考察(J06-1 マイクロ・ナノ構造と変形解析,J06 計算マイクロ・ナノメカニクス)

概要

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Atomistic behavior of the shape memory alloy is investigated by using the molecular dynamics simulations. An embedded-atom-method potential function for Ni-Al, which has been reported to exhibit both of bcc and martensite structures for 60-70% Ni model, is applied to demonstrate simulations. When shear load is imposed on the model, twin deformation occurs and macroscopic deformation is observed. The original shape is recovered by heating the model to a temperature higher than the transformation point, and cooling to the low temperature. The influence of the inhomogeneous distribution of Ni and Al atoms in the model on the deformation and transformation is discussed in this study. Also, the initiation and propagation of the deformed region in the variant layer is demonstrated.
2005-09-18