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Formation of Nanocrystalline Intermetallic Compounds for Ti-Al-Si System by Mechanical Alloying

Liu Kaiwen; Zhang Jishan; Wang Jinguo; Cui Xingfa; Chen Guoliang(State Key Laboratory of Advanced Metals and Materials, UST Beijing, Beijing 100083, China)  
Amorphous phase was obtained by mechanical alloying of Ti-Al-Sipowders with four different composition. The structure evolution of the as-milled amor-phous phase during the annealing treatment is classified into three stages: the first ispartial crystallization of amorphous phase producing Ti5Si3 phase; the second is crystalliza-tion of the rest amorphous phase producing the corresponding titanium aluminides accord-ing to the relative amount of Ti and Al in the elemental mixture; and the last one isgrain growth of all the phase in powders. The crystallization result in formation of Ti3Al,TiAl and Al3Ti according the powder composition. Ti5Si3 is the only silicide produced bycrystallization reaction. The annealing treatment (less than 8OO℃ for A3, A4 and A5, and750℃ for A6) shows that the grain size of all the phases fall in nanometer range.
【Fund】: 国家自然科学基金
【CateGory Index】: TB383
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