Abstract
Ti-Nb shape memory alloys were fabricated in six compositions of Ti-(18-28)at%Nb by powder metallurgy (P/M) process. Microstructure, elastic modulus and shape recovery properties of the alloys were investigated. Ti-(18-20)at%Nb and Ti-(22-28)at%Nb alloys consisted of the α+β phase and the β phase at 300 K, respectively. This change in crystal structure possibly lowered the transformation temperature of the alloy with increasing Nb content of the alloy. The elastic modules of the P/M alloys were higher than that of the wrought alloys. This may be due to increase in oxygen content of the P/M alloys and difference in crystal structure between the wrought alloy and the P/M alloy. Annealing after cold-rolling resulted in recrystallization texture of β phase of the cold-rolled alloy, which improved the shape recovery properties of the alloy. Ti-22at%Nb alloy annealed at 1273 K for 0.18 ks had a recovery strain of 0.34 %.
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