Volume 5, Issue 4 (Autumn 2008 2008)                   IJMSE 2008, 5(4): 25-31 | Back to browse issues page

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H. Shahmir, M. Nili Ahmadabadi, F. Naghdi. TRANSFORMATION BEHAVIOR OF NiTi SHAPE MEMORY ALLOYS TREATED BY THERMOMECHANICAL PROCESSING USING DSC . IJMSE 2008; 5 (4) :25-31
URL: http://ijmse.iust.ac.ir/article-1-148-en.html
TRANSFORMATION BEHAVIOR OF NiTi SHAPE MEMORY ALLOYS TREATED BY THERMOMECHANICAL PROCESSING USING DSC
H. Shahmir , M. Nili Ahmadabadi , F. Naghdi
Abstract:   (28455 Views)
Abstract: In the present study the effect of thermomechanical treatment (cold work and annealing) on the transformation behavior of NiTi shape memory alloys was studied. Differential scanning calorimetry was used to determine transformation temperature and its relation to precipitates and defects. Three alloys including Ti-50.3at.% Ni, Ti-50.5at.% Ni (reclamated orthodontic wires) and 50.6at.% Ni alloy were annealed at 673 K and 773 K for 30 and 60 min after 15% cold rolling. It was found that the transformation characteristics of these alloys are sensitive to annealing treatment and composition. The temperature range of transformation is broadened during cold working and after subsequent annealing, the intermediate phase was appeared. The peaks become sharper and close together on each cooling and heating cycle with increasing annealing temperature and time
Keywords: NiTi; Shape memory alloy; Thermomechanical treatment; Cold working; Annealing; DSC.
     
Type of Study: Research Paper |
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