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Effect of Isochronic Aging on Transformation Behavior in Ti-50.85at%Ni Alloy  

Kim, J.I. (Materials and Science Engineering, Dong-A University)
Sung, J.H. (Materials and Science Engineering, Dong-A University)
Kim, Y.H. (Materials and Science Engineering, Dong-A University)
Lee, J.H. (Materials and Science Engineering, Dong-A University)
Miyazaki, S. (Institute of Materials Science, University of Tsukuba)
Publication Information
Journal of the Korean Society for Heat Treatment / v.22, no.2, 2009 , pp. 101-107 More about this Journal
Abstract
Effect of isochronic aging on transformation behavior of Ti-50.85at%Ni alloy were investigated by differential scanning calorimeter (DSC). The martensitic transformation temperature increases with increasing annealing temperature until reaching a maximum, and then decreases with further increasing annealing temperature. This can be rationalized by interaction between the distribution of $Ti_3Ni_4$ precipitates and Ni content in the matrix. The R-phase transformation temperature increases with increasing annealing temperature until reaching a maximum, and then decreases with a further increase of annealing temperature. This is attributed to the change of Ni content in the matrix caused by precipitation of $Ti_3Ni_4$. The occurrence of the multiple-stage martensitic and R-phase transformation is attributed to precipitation-induced inhomogeneity of the matrix, both in terms of composition and of internal stress fields.
Keywords
Aging; Shape memory alloy; Matensite; R phase; $Ti_3Ni_4$ precipitate;
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