Microstructural evolution of mechanically alloyed Mo–Si–B–Zr–Y powders |
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| Affiliation: | 1. Korea Institute of Industrial Technology, Incheon 406-840, Republic of Korea;2. Material Science and Engineering, Inha University, Incheon 402-751, Republic of Korea;1. Institute of Materials Physics and Chemistry, Northeastern University, Shenyang 110819, China;2. Xiamen Honglu Tungsten Molybdenum Industry Co. Ltd., Xiamen, 361021, China;3. China National R&D Center for Tungsten Technology, Xiamen Tungsten Co. Ltd., 361026 Xiamen, PR China;4. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China;1. School of Mechanical Engineering, The University of Adelaide, South Australia, Australia;2. GeniCore, Warsaw, Poland;3. School of Engineering, Edith Cowan University WA, Australia;1. VTT Technical Research Centre of Finland Ltd, Sinitaival 6, 33720 Tampere, Finland;2. VTT expert Services Ltd, Kemistintie 3, 02150 Espoo, Finland;3. Tampere University of Technology, Korkeakoulunkatu 6, 33720 Tampere, Finland |
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| Abstract: | Elemental powder mixtures with compositions of Mo–13.8Si, Mo–20B and Mo–12Si–10B–3Zr–0.3Y (at.%) were respectively milled in a high energy planetary ball mill at a speed of 500 rpm. Microstructural evolution of powder particles during milling processes was evaluated. The results show that B can hardly be dissolved into Mo under present milling conditions and the additions of B and Si both accelerate the refining rate of Mo crystallites. For Mo–12Si–10B–3Zr–0.3Y system, the morphology and internal structure of powder particles change significantly with milling time. After 40 h of milling, an almost strain-free super-saturated molybdenum solid solution with a grain size of about 6.5 nm forms. The grain refinement mechanism and dissolution kinetics of solute atoms are highlighted. Both thermodynamic calculation and experimental results reveal that for the present alloy composition it is more favorable to form solid solution than amorphous phase. |
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