Texture in Cu- based shape memory strips obtained by twin roll casting

C. SOBRERO, R. BOLMARO, J. MALARRÍA, P. OCHIN AND R. PORTIER

Bochum, Germany

Conferencia; 7th European Symposium on Martensitic Transformations and Shape Memory Alloys; 2006

Strips of Cu-13Al-5Ni-1Ti (wt %) of about 400 µm thickness, were obtained by twin roll casting directly from the melt. Temperature-induced transformations under constant tensile load show a larger deformation, associated to the reversible martensitic transformation, for strips annealed at 700°C and 900°C than for the as-cast samples. This effect is partially ascribed to relaxation of internal stresses produced by the rapid solidification, some recovery of short-range disorder and microstructural changes related with Ti-rich X-phase precipitates. On the other hand, the strips show a columnar grain morphology and annealing leads to an increase of texture intensity related with the increase in elongation rate. Columnar grains are mostly aligned with the <040>R18//<100>DO3 directions.