Since Ti reacts preferably with oxygen to form titanium oxide, Ni content increases between the matrix and the oxide, forming compounds and Ni-rich region. Because transformation temperature of Ni-Ti alloy depends strongly on Ni contents, the Ni-rich region affects transformation as well as deformation behavior. It is found out that the oxidation resultant including Ni-rich region lowers Ms and As temperatures in the alloys undergoing B2⇋ M transformation. In case of alloy of B2→R→M transformation, a significant decrease in B2→R transformation temperature is observed near surface. Besides, no R→M transformation is observed when it is cooled to 123K, while Ms of the matrix is 250K. The Ni-rich region experiences more plastic deformation than the matrix during superelastic deformation, since slip occurs instead of formation of stress-induced martensite. It is summarized that increase in Ni content near surface by oxidation retards martensitic transformation and prevents SIM deformation by lowering enormously transformation temperature.

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