Abstract
Presently, the R and martensitic transformation of TiNi alloy can be separated by aging or adding a third element. It is generally accepted that in the cooling process the TiNi alloy experiences B2 (parent phase) [r arrow] IC (Incommensurate) [r arrow] R (Rhombohedral) [r arrow] M (Martensite), in which B2 [r arrow] IC transformation is second order while IC [r arrow] R is first order. However, other analyses using the charge density wave (CDW) model and Landau's theory have deduced that the B2 [r arrow] IC is also a first order phase change. But it has not been experimentally confirmed yet. The present study aims at investigating the three transformations in rapidly solidified TiNi alloy.
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