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

C. SOBRERO; R. BOLMARO; J. MALARRÍA; P. OCHIN; R. PORTIER

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

elsevier

Año: 2008 vol. 481 p. 688 - 692

0921-5093

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.