Smart materials: Material synthesis and characterization of CuAl based shape memory alloys

Abstract

Shape memory alloys (SMA) are materials that have the ability to return to its original shape when heated above the Austenite finish temperature. The synthesis and characterization of Cu-Al-based shape memory alloys were discussed. The composition of Cu-Al-X (X = Mn, Be, Ni, Ag, Cr, Zn, Fe) shape memory alloys will be altered during the preparation process using an induction furnace or Resistance furnace with Ar amosphere. The prepared samples exhibits a heterogeneous structure. The sample must undergo homogenization heat treatment. This leads to a state of homogeneity in the phases. Homogenized samples represent only stable phases i.e., γ and β phases. These phases should be transformed to ${\gamma }_1^{\prime }$ and ${\beta }_1^{\prime }$'phases. These stages are necessary to demonstrate shape memory properties. Phase transformations are characterized by XRD studies and Scanning Electron microscopy. Transformation temperatures at which these phase transformations occur are determined by Differential Scanning Calorimetry.