Martensitic transformation of annealed Ti50Ni25Cu25 melt-spun ribbons

Martensitic transformation of annealed melt-spun Ti50Ni25Cu25 ribbons is investigated. Experimental results reveal that Ti50Ni25Cu25 ribbons annealed at a temperature above or below Tx have identical crystallization behavior and exhibit B2 ↔ B19 martensitic transformation. Ti50Ni25Cu25 ribbons can have good shape memory effect and damping capacity when annealed under appropriate conditions to acquire abundant crystallized grains with low Cu content. In order to obtain the optimal shape memory effect, it is better to anneal crystallized ribbons at temperature between Tg and Tx because crystallization of ribbons is slower and it is easier to control their properties.