Abstract
Structure evolution of amorphous phase obtained by mechanical alloying for Ti-Al-Si during the annealing treatment was investigated. Microstructure development was monitored by X-ray diffraction, differential thermal analysis and transmission electron microscopy. The structure evolution of the amorphous phase treatment can be classified into the first stage partial crystallization of amorphous phase producing Ti 5Si 3 phase, the second stage crystallization of the remaining amorphous phase producing the corresponding titanium aluminides, and last grain growth of all. Crystallization results in the formation of Ti 3Al, TiAl and Al 3Ti according to the relative amount of elemental mixtures of Ti and Al. Ti 5Si 3 is the only titanium silicide produced by crystallization. Annealing at less than 800°C produced nanocrystalline composites of Al 3Ti, TiAl, Ti 3Al and Ti 5Si 3 with a grain size less than 20 nm. At high annealing temperature crystalline sizes of all phases increase.
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