Effect of post-deformation annealing on the R-phase transformation temperatures in NiTi shape memory alloys |
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| Affiliation: | 1. FNSPE, CTU Prague, Trojanova 13, 12000 Prague, Czech Republic;2. Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic;3. ESRF, 71, Avenue des Martyrs, 38043 Grenoble, France;1. Department of Materials Engineering, University of Leuven (KU Leuven), Kasteelpark Arenberg 44 bus 2450, Leuven B3001, Belgium;2. Departament de Física, Universitat de les Illes Balears, Cra Valldemossa km 7.5, Palma de Mallorca E07122, Spain;3. ITMO University, 49 Kronverkskiy av., St. Petersburg 197101, Russia;4. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People’s Republic of China;5. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, Antwerp B2020, Belgium;1. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA;2. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA;1. Mechanical Engineering Department, Universitat Rovira i Virgili, Avinguda dels Països Catalans 26, 43007 Tarragona, Spain;2. Scientific Resources Service, Universitat Rovira i Virgili, Avinguda dels Països Catalans 26, 43007 Tarragona, Spain;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping 102249, Beijing, China;2. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, China;1. State Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing, 102249, China;2. X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA;3. School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, WA 6009, Australia;4. Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS), Shanghai, 201800, China;5. Fort Wayne Metals Research Products Corporation, 9609 Ardmore Avenue, Fort Wayne, IN 46809, USA;6. Department of Physics, Northern Illinois University, De Kalb, IL 60115, USA |
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| Abstract: | In NiTi shape memory alloys, both the annihilation of dislocations and the formation of Ni4Ti3 precipitates may occur during post-deformation annealing. Different responses of the R-phase transformation temperatures to the annealing conditions have been reported. In order to find out the main factor(s) affecting the R-phase transformation temperatures during post-deformation annealing, a Ti-49.8 at% Ni and a Ti-50.8 at% Ni alloy were subjected to various post-deformation annealing and thermal cycling treatments. The results show that the R-phase transformation temperatures are very stable in the Ti-49.8 at% Ni alloy, while a significant variation is observed in the Ti-50.8 at% Ni alloy with respect to the annealing and thermal cycling conditions. These findings suggest that the R-phase transformation temperatures are not susceptible to the change of dislocation density and depends mainly on the Ni concentration of the matrix, which can be modified by the formation of Ni4Ti3 precipitates. |
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| Keywords: | A Shape–memory alloys B Martensitic transformation B Annealing F Differential scanning calorimetry |
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