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Influence of aging temperature on phase transformation and mechanical behavior of NiTi thin films deposited by magnetron sputtering technique | ||
Journal of Ultrafine Grained and Nanostructured Materials | ||
دوره 53، شماره 1، شهریور 2020، صفحه 15-22 اصل مقاله (1.07 M) | ||
نوع مقاله: Research Paper | ||
شناسه دیجیتال (DOI): 10.22059/jufgnsm.2020.01.03 | ||
نویسندگان | ||
Hamed Daneshvar1؛ Mir Saman Safavi1؛ Vida Khalili2؛ Jafar Khalil-Allafi* 1 | ||
1Research Center for Advanced Materials, Faculty of Materials Engineering, Sahand University of Technology, Tabriz, Iran | ||
2Department of Materials Science and Engineering, University of Bonab, Bonab, Iran. | ||
چکیده | ||
In this study, NiTi thin films were deposited on the glass and NaCl substrates by means of magnetron sputtering method. The influence of aging temperature, over the range 300-500 oC, on phase transformation and mechanical properties of the sputtered NiTi thin films were studied by differential scanning calorimetry (DSC) and nano-indentation assay, respectively. The DSC curves showed that the aged specimens at 350, 400, and 500°C underwent two steps transformation during cooling process while a three steps transformation has been observed for the film aged at 450°C. This behavior clearly demonstrated the heterogeneity in chemical composition and microstructure of the sputtered thin film, which consequently resulted in the martensitic transformation of R and remained B2 to B19' within two steps. According to nano-indentation analysis results, a peak point at aging temperature of 450°C is reached. The temperature hysteresis of all aged films was about 1°C, which can be considered as a positive sign for sensor application. | ||
کلیدواژهها | ||
NiTi thin film؛ Magnetron sputtering؛ Aging temperature؛ Mechanical behavior؛ Phase transformation؛ sensor | ||
مراجع | ||
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