Fabrication of Cu-based high-temperature shape memory alloys and investigation of their physical properties

Abstract In this study, High Temperature Shape Memory Alloys CuAlCr and CuAlCrNi that have drawn attention recently due to their technological applications were investigated. These alloys were produced by melting method in an arc-melter furnace. The phase transformation and microstructure properties of produced high-temperature shape-memory alloys were studied by means of Differential Scanning Calorimeter (DSC), X-ray diffraction (XRD), Optical microscopy (OM), Scanning electron microscopy (SEM) and Vickers microhardness measurements at different heat treatment. According to DSC measurement, all of alloys exhibited high temperature shape memory effects. Crystal structure of alloys measurement by means of X ray diffractometer. Two martensite phases named as tin and thick plate can be seen in xrd results. At the end of experimental measurements, it was observed that the addition of nickel decreases the transformation temperature of CuAlCr and also change the crystal structure. Optical micrographic shows that there are a lot of grain and precipitates in the structure of alloys. Also, it is seen in SEM micrographic that the grain border is clearly visible.