engleski

Microstructural and phase analysis of CuAlNi shape memory alloy after continuous casting

The results of the characterization of a CuAlNi shape memory alloy after continuous casting technology are shown. Using this procedure a bar with a diameter of 8 mm was manufactured. After solidification of the alloy the microstructure characterization was carried out by optic microscopy (OM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) methods. Our results showed that the as-casted alloy consisted from parent β1 and β1΄-martensite phases. The martensite phase primary as the needle-like into grains was observed. Martensite laths have different orientations into particular grains. It was found that average grains size was 98.78 micrometer. The grain diameter near to the external surface is higher than into the center. The average hardness of the alloy was 275 HV1.

shape memory alloys ; martensite ; continuous casting ; grain size

Glavni autor: Mirko Gojić, Stjepan Kožuh