Transformation behavior of explosively welded TiNi/TiNi laminate after diffusion annealing and aging

This paper reports the creation of compositionally graded NiTi plates with widened transformation temperature windows by means of diffusion annealing and aging of explosively welded (Ti-50.4 at.%Ni)/(Ti-49.8 at.%Ni) laminates. The transformation behavior of the laminate was investigated by means of differential scanning calorimetry. The laminate samples after diffusion annealing and aging showed greatly enlarged reverse transformation temperature window of 70–90 °C, about twice wide as that of the Ti-50.4 at.%Ni alloy.