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《Materials Science and Engineering of Powder Metallargy》 2005-02
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Synthesis of Mo(Si, Al)_2 powders by mechanical alloying

XIAO Lai-rong, YI Dan-qing, SONG Cheng, CAI Zhi-gang, XU Liang-liang (School of Materials Science and Engineering, Central South University, Changsha 410083, China)  
Mo(Si 1-x , Al x) 2 powders have been synthesized by means of mechanical alloying with MoSi 2, Mo and Al mixture powders. The phase change and grain size of powders were characterized by X-ray diffraction. The appearance and particle size of powders were determined by SEM. Using Burgio model, the synthesis energy of Mo(Si, Al) 2 by mechanical alloying was calculated. Results show that there are MoSi 2 and Mo(Si, Al) 2 after milled for 5h, no remained pure powders and no Al-Mo interim phase appearing in the milling process of MoSi 2, Mo and Al mixture powders; the particle size is nearly sub-micro after milled for 40h and the grain size is 21~40nm. The formation mechanism of Mo(Si, Al) 2 by mechanical alloying is similar self-propagation high-temperature synthesis(SHS), and the milling energy of about 15.4kJ/g will be needed for the phase formation.
【Fund】: 教育部博士点基金项目(20010533003)
【CateGory Index】: TF123.11
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