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The influence of annealing temperature on the shape memory effect(SME) and recovery ratio of cold-rolled dual-phase Ni_(58)Mn_(25)Ga_(16.9)Gd_(0.1) high-temperature shape memory alloy were investigated.The results showed that the SME can be improved by appropriate annealing.SME of 6.0%and recovery ratio of 98%were observed in the rolled alloy at 550 ℃ annealing,which were larger than that of the samples annealed at other temperatures.The annealing temperature was in between the recrystallization temperatures of the martensite and γ phase,which leads to the work-hardening state ofγ phase kept unchanged during annealing process,and therefore,the critical slip stress of γ phase increased.Thus,the plastic deformation of γ phase reduced during the compression process,and the SME increased.
The influence of annealing temperature on the shape memory effect (SME) and recovery ratio of cold-rolled dual-phase Ni_ (58) Mn_ (25) Ga_ (16.9) Gd_ (0.1) showed that the SME can be improved by appropriate annealing. The MS of 6.0% and recovery ratio of 98% were observed in the rolled alloy at 550 ° C annealing, which were larger than that of the samples annealed at other temperatures. annealing temperature was in between the recrystallization temperatures of the martensite and γ phase, which leads to the work-hardening state of γ phase kept unchanged during annealing process, and therefore, the critical slip stress of γ phase increased. tou, the plastic deformation of γ phase reduced during the compression process, and the SME increased.