Shape memory effect in thin films of a Cu–Al–Ni alloy

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• 作者：F.C. Lovey ; A.M. Condó ; J. Guimpel ; M.J. Yacamá ; n
• 关键词：Shape memory thin films ; Nano-structured material ; Cu– ; Al– ; Ni alloy
• 刊名：Materials Science and Engineering: A
• 出版年：2008
• 出版时间：25 May 2008
• 年：2008
• 卷：481-482
• 期：Complete
• 页码：426-430
• 全文大小：910 K

文摘

Thin films of Cu–26.9 at. % Al–5.5 at. % Ni were grown by dc magnetron sputtering from the alloy target previously melted in an induction furnace. The films were grown either on glass or (1 0 0)Si substrates at room temperature. The films, of approximately 3 μm thickness, were peeled off from the substrate for further studies. The structures and microstructures of the as grown films were analysed by transmission electron microscopy. A nanometric mixture of BCC and 2H phases was found irrespective of the substrate. The shape memory effect was not observed for this structural state. After an annealing at 1023 K for 3600 s in He or Ar flux, followed by quenching to room temperature, the films were found to be in a martensitic state. Mainly the 18R structure was observed. At this stage the films were mechanically deformed at room temperature and then heated up to 373 K. A good shape recovery was observed to take place in a temperature range between 334 and 360 K.