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The Effect of Ageing on the Transformation Behavior of $Ti-50.1at\%$ Ni Alloy(I)  

Woo Heung-Sik (Department of Safety Engineering, Dongguk University)
Park Sung-Bum (Department of Safety Engineering, Dongguk University)
Kang Bong-Su (Department of Safety Engineering, Dongguk University)
Kim Sung-Jin (Department of Materials Science and Engineering, Kumoh National University)
Publication Information
Journal of the Korean Society of Safety / v.19, no.4, 2004 , pp. 1-7 More about this Journal
Abstract
This study investigated the effects of aging on the transformation behavior of $Ti-50.1at\%$ Ni alloy by means of differential scanning calorimetry. It was found that aging in the temperature range of $350^{\circ}C\~550^{\circ}C$ induced complex transformation behavior, involving the R-phase and multiple-stage martensitic transformation. Usually aged Ni-rich NiTi alloys undergo martensitic transformation on cooling from high temperatures in two step : B2 to R and then R to Bl9'(normal behavior). But under certain ageing conditions, the transformation can also occur in three or more step(unusual multiple step behavior). In the present study we use differential seaming calorimetry(DSC) for a systematic investigation of the evolution of transformation behavior with ageing temperature and time.
Keywords
TiNi; shape memory alloy(SMA); ageing; DSC(Differential scanning calorimetry); B2; B19'; R;
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