Correlation between austenitic and martensitic textures on Cu-Al-Ni-Ti shape memory alloys

C. SOBRERO, J. MALARRÍA, A. ROATTA AND R. E. BOLMARO

Pittsburgh, Pennsylvania (USA)

Congreso; 15th International Conference on Textures of Materials (ICOTOM 15); 2008

Cu-13%Al-5.5%Ni-1%Ti (Wt%) shape memory alloys were measured at room and above Af temperatures to search for texture correlations between different phases. Textures were measured by X-ray diffraction techniques. High temperature textures were measured by a specially designed device allowing textures to be measured until 200 C. Room temperature textures were obtained in a material produced by hot square extrusion and further annealing thermal treatment. They belong to the martensitic 18R1 monoclinic phase. At high temperature the phases are the austenitic FCC, with a next-nearest neighbor order, and a low volume fraction of the X phase as precipitates. The correlation between textures is investigated by quantitative texture analysis and computer simulations. Preferential variant selection is evaluated for a few cycles to quantitatively asses shape memory effect.