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Aluminum diboride synthesis from elemental powders by mechanical alloying and annealing
Authors:Duygu Ağaoğulları  Hasan Gökçe  İsmail Duman  M. Lütfi Öveçoğlu
Affiliation:1. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, PR China;2. Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, PR China;3. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Department of Mechanical Engineering, BITS-Pilani Hyderabad Campus, Hyderabad 500078, India;2. Advanced Materials & Processed Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;1. Department of Physics, Fudan University, Shanghai, 200433, PR China;2. School of Science, Westlake University, 18 Shilongshan Road, Hangzhou, 310024, PR China;3. Institute of Natural Sciences, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou, 310024, PR China;4. Department of Physics, Zhejiang University, Hangzhou, 310027, PR China
Abstract:In this study, AlB2 powders were synthesized by using a combined method of mechanical alloying (MA) and annealing of elemental aluminum (Al) and boron (B) powders. Milling was performed in a planetary ball-mill (Fritsch? Pulverisette 7 Premium Line) up to 15 h under argon (Ar) atmosphere. Annealing process was carried out in a tube furnace at 650 °C for 6 h under Ar atmosphere. The effects of MA durations on the annealing process and AlB2 formation were investigated. The conversion of Al and B powders to AlB2 starts after only MA for 3 h or after MA for 1 h and subsequent annealing. A slight formation of AlB12 occurs at 242 °C for as-blended powders and it shifts to about 272 °C for MA’d powders. Al–B powder blends MA’d for 9 h and annealed have AlB2 particles in size between 35 and 75 nm in the presence of Al13Fe4, Fe3B and Fe2B contaminations.
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