Parametric optimization of Ti–Ni powder mixtures produced by mechanical alloying |
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| Authors: | F Neves FM Braz Fernandes I Martins JB Correia |
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| Affiliation: | 1. Université Lille 1 sciences et technologies, UMET – UMR CNRS 8207/ENSCL/Université de Lille, team Métallurgie Physique et Génie des Matériaux, Bâtiment C6, 59655 Villeneuve d''Ascq, France;2. Valeo Engine Electrical Systems, 2 Rue André Boulle, 94046 Créteil, France;3. Max-Planck-Institut für Eisenforschung, Abteilung Mikrostrukturphysik und Umformtechnik, Max-Planck-Strasse 1, 40237 Düsseldorf, Germany;1. Hybrid Materials Center (HMC), Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neugdong-ro, Gwangjin-gu, Seoul 143-747, Republic of Korea;2. Graphene Research Institute (GRI) & HMC, Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 143-747, Republic of Korea;3. High Temp Energy Materials Research Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seoungbuk-gu, Seoul 136-791, Republic of Korea;4. Global Technology Center, Samsung Electronics Co., Ltd., 129 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-742, Republic of Korea;1. Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland;2. ETH Zürich, IWF - Institute for Machine Tools and Manufacturing, Leonhardstrasse 21, Zurich, Switzerland;3. Inspire AG, icams, Lerchenfeldstrasse 5, St. Gallen, Switzerland;4. MBN Nanomaterialia S.p.A., Via G. Bortolan 42, 31050 Vascon di Carbonera, TV, Italy |
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| Abstract: | In this study, a set of Ti–50 at.% Ni elemental powder mixtures were processed through mechanical alloying (MA). The objectives were to induce during MA the formation of a lamellar microstructure and to apply a design of experiments, based on the Taguchi method, to optimize the MA parameters. Enthalpy measurements associated to the high temperature reaction between Ni and Ti powders were used to evaluate the effect of the MA parameters. It is known that different ball-impact energies lead to different reaction pathways. The results indicate that milling time affects significantly (74% contribution) the enthalpy of the high temperature reaction while the milling speed has a lower effect (25% contribution). Moreover, whatever the milling conditions, the powder was a mixture of both crystalline phases and an amorphous phase. Their microstructure was composed of a multilayer of alternating Ni and Ti that in some cases was constituted by nanolayers. The oxygen and nitrogen contents of the milled powders ranged between 0.29 and 0.79 wt%, and 0.15 and 0.90 wt%, respectively. |
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