关键词: 自发形状变化, 双程形状记忆效应, 冷轧, 应力诱发马氏体, 各向异性, 马氏体相变温度, 热膨胀

Abstract: The cold-rolled Cu-18Al-10.5Mn alloy was investigated for its martensite transformation caused by cold rolling by means of dilatometer, X-ray diffraction and DSC. The results showed that cold rolling process can induce texture of stress-induced martensite and two-way shape memory effect in specific direction. The control of cold rolling reduction can change shapes freely and spontaneously to a certain extent, either forwardly or reversely, and realize the effect of low thermal expansion. The range of martensite transform temperature will be much wider if increasing the reduction. The results of X-ray diffraction in the three sections, i.e. normal to rolling direction (RD) and normal direction (ND), showed that the martensite texture is stress-induced to release the stress due to cold rolling to utmost extent. With the change in temperature, the optimization-oriented stress induces the nuclear growth/disappearance of martensites, which is just the root cause of the anisotropy of reversibly spontaneous change of shapes.