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TRANSFORMATION BEHAVIOR OF NiTi SHAPE MEMORY ALLOYS TREATED BY THERMOMECHANICAL PROCESSING USING DSC
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نویسنده
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Shahmir H. ,Nili Ahmadabadi M ,Naghdi F
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منبع
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iranian journal of materials science and engineering - 2008 - دوره : 5 - شماره : 4 - صفحه:25 -31
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چکیده
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In the present study the effect of thermomechanical treatment (cold work and annealing) on the transformation behavior of ni'ii shape memory alloys was studied. differential scanning calorimetry was used todetermine 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.% nt alloy were annealed at 673 k and 773 kfor 30 and 60 min after 15% cold rolling. it was found that the transformation characteristics ofthese alloys are sensitive toannealing treatment and composition. the temperature range of transformation is broadened during cold working andafter 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.
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کلیدواژه
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Ni'Ii; Shape memory alloy; Thermomechanical treatment; Cold working: Annealing; DSC.
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آدرس
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university of tehran, Faculty of Engineering, Departrnent of Metallurgy and Materials Engineering, ایران, university of tehran, Faculty of Engineering, Center of Excellence for High Performance Materials, ایران, university of tehran, Faculty of Engineering, Departrnent of Metallurgy and Materials Engineering, ایران
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پست الکترونیکی
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nili@ut.ac. ir
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Authors
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