2010•Heat treatment of metalsRequires access
Effect of annealing time on microstructure and deformation behavior of Ti-49.8Ni shape memory alloy
Wang Yong-shan
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Abstract
The microstructure and deformation behavior of Ti-49.8Ni shape memory alloy were investigated by optical microscope,X-ray diffraction and tensile test.The results show that the microstructure of cold-worked and 400 ℃ annealed Ti-49.8Ni alloy is fibrous.The effect of annealing time on microstructure of the alloy is not serious.The main composition phase of Ti-49.8Ni alloy is martensite at room temperature.With increasing the annealing time,the martensite reorientation stress of the alloy spring annealed at 400 ℃ decreases first and then increases,that of 600 ℃ annealed alloy spring increases.With increasing the deforming temperature,both martensite reorientation stress and the rigidity of the alloy springs increase.The fit annealing process for deforming in Ti-49.8Ni shape memory alloy is annealing at 600 ℃ for 1 h.