Application of in-situ nano-scanning calorimetry and X-ray diffraction to characterize Ni–Ti–Hf high-temperature shape memory alloys

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Application of in-situ nano-scanning calorimetry and X-ray diffraction to characterize Ni–Ti–Hf high-temperature shape memory alloys

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Title: Application of in-situ nano-scanning calorimetry and X-ray diffraction to characterize Ni–Ti–Hf high-temperature shape memory alloys
Author: McCluskey, Patrick; Xiao, Kechao; Gregoire, John M.; Dale, Darren; Vlassak, Joost J.

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Citation: McCluskey, Patrick J., Kechao Xiao, John M. Gregoire, Darren Dale, and Joost J. Vlassak. 2015. “Application of in-Situ Nano-Scanning Calorimetry and X-Ray Diffraction to Characterize Ni–Ti–Hf High-Temperature Shape Memory Alloys.” Thermochimica Acta 603 (March): 53–62. doi:10.1016/j.tca.2014.07.023.
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Abstract: Combinatorial nanocalorimetry and synchrotron x-ray diffraction were combined to study the martensite-austenite (M-A) phase transformation behavior of Ni-Ti-Hf shape memory alloys. A thin-film library of Ni-Ti-Hf samples with a range of compositions was deposited on a parallel nano-scanning calorimeter device using sputter deposition. Crystallization of each amorphous as-deposited sample by local heating at approximately 104 K/s produced a nanoscale grain structure of austenite and martensite. Individual samples were then cycled through the M-A transformation, while the transformation enthalpy was measured by nanocalorimetry and the low- and high-temperature phase compositions were determined by x-ray diffraction. The techniques enable correlation of the observed behavior during thermal cycling with the thermodynamic and structural properties of the samples.
Published Version: doi:10.1016/j.tca.2014.07.023
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:22068309
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