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XRD analysis of CuAlNi shape memory alloy before and after heat treatment

Shape memory alloys (SMAs) belong to a class of shape memory materials which have the ability to ‘memorise’ or retain their previous shape when subjected to certain thermal or mechanical loading. SMAs have drawn significant attention due to their unique properties. The Cu-based SMAs are low costing SMAs comparing to the NiTi- based alloys. Among the Cu-based SMAs, the CuAlNi alloys show good shape memory properties and the possibility of high temperature application (up to 200 °C). In this work the CuAlNi alloy was produced by vertical continuous casting method in form of a cylinder rod of 8 mm in diameter. After the casting the heat treatment was performed, i.e. solution annealing and tempering. The microstructure characterization of SMAs was carried out by X- ray diffraction analysis, optical microscopy (OM) and scanning electron microscopy (SEM) equipped by device for energy dispersive spectroscopy (EDS). The peaks of different types of martensite (β1’ and γ1’) were observed at XRD diffractograms. The homogenous martensite microstructure was confirmed by OM and SEM micrographs.

shape memory alloys ; heat treatment ; microstructure ; martensite ; XRD analysis

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