Mechanical alloying and magnetic saturation of tungsten–nickel powders |
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| Affiliation: | 1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China;2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Maanshan 243002, China;1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2. Industry and Equipment Technology Institute of HFUT, Hefei University of Technology, Hefei 230009, China;3. International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;4. China International S&T Cooperation Base for Advanced Energy and Environmental Materials, Hefei 230009, China;5. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xian Jiaotong University, Xian, Shanxi 710049, China;6. Institut für Energie und Klimaforschung-Plasmaphysik, Forschungszentrum Jülich GmbH, Jülich 52425, Germany |
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| Abstract: | Alloying mechanism and magnetic saturation of tungsten and W-40 wt.% Ni milled powders were investigated using XRD, SEM and saturation magnetisation techniques. Mechanical alloying was proceeded by deformation of FCC Ni toward FCT phase and BCC to BCT in W, hence formation of supersaturated tetragonal Ni(W) solid solution. Milling of pure W yielded a product comprised of magnetic BCT and non-magnetic nanocrystalline BCC W powders. The magnetic saturation of W increased at the early milling stage and decreased later due to the transition of the BCC W structure toward anisotropic close packed crystal structure and formation of nanograins with high specific surface. Magnetic saturation of W–Ni powders decreased with milling time but increased after forming a metastable tetragonal solid solution. |
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