Deformation-induced point defects in NiAl single crystals |
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| Affiliation: | 1. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA;2. Department of Chemical, Bio. and Materials Engineering, Arizona State University, Tempe, AZ 85287, USA;1. Physics Department, Gurukula Kangri Vishwavidyalaya, Haridwar 249404, Uttarakhand, India;2. Department of Physics, Texas A&M University at Qatar, Education City, Doha 23874, Qatar;3. Physics Department, Indian Institute of Technology Roorkee, 247667, Uttarakhand, India;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China;1. IFW Dresden, P.O. Box 27 01 16, D-01171 Dresden, Germany;2. TU Bergakademie Freiberg, Institut für Werkstoffwissenschaft, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany;3. Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Wien, Austria;4. Department of Materials Science and Engineering, North Carolina State University, Campus Box 7907, Raleigh, NC 27695-7907, USA;5. TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany;1. National Research Centre ‘Kurchatov Institute’, Kurchatov Square 1, 123182 Moscow, Russia;2. National University of Science and Technology “MISIS”, Leninskiy Prospekt 4, 119991 Moscow, Russia |
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| Abstract: | NiAl single crystals, oriented for single slip, were deformed at room temperature to a strain of 2%, and were subsequently annealed in the temperature range of 673–873 K (T/Tm=0.35–0.45). In as-deformed samples, dislocation substructures consist of jogged edge and screw dislocations, and prismatic loops. Densities of vacancy- and interstitial-type loops are about equal. Annealing causes shrinkage and disappearance of the interstitial loops and significant growth of the vacancy loops. These observations suggest that excess vacancies are present after room temperature deformation. These non-equilibrium point defects may result from non-conservative motion of jogged screw dislocations. |
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