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Microstructure and Reaction Process of In-situ Ti2AlC/TiAl Composite
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    Abstract:

    Ti2AlC/TiAl composite was prepared with self-propagating high-temperature synthesis (SHS) followed by vacuum arc melting using Ti, Al powers and short carbon fibers as raw materials. Precipitated phases and formed microstructures of Ti2AlC/TiAl composite were investigated by means of X-ray diffraction, scanning electron microscope and transmission electron microscopy, and the reaction process was also discussed. Results show the microstructure of as-cast Ti2AlC/TiAl composite is composed of Ti2AlC, TiAl and Ti3Al phases, the matrix are mainly of α2(Ti3Al)+γ(TiAl) phases with lamellar structure and γ(TiAl) phase with equiaxed structure, and the precipitated in-situ Ti2AlC short fibers or particles dispersively distribute in the matrix. Ti3Al phase is decomposed to TiAl and Ti2AlC particles after annealed at 1200 °C for 4 h, and the Ti2AlC short fibers are enlarged and secondary Ti2AlC is precipitated after the annealing treatment.

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[Zeng Lingxiao, Chang Hui, Hu Rui, Zhang Tiebang, Li Jinshan. Microstructure and Reaction Process of In-situ Ti2AlC/TiAl Composite[J]. Rare Metal Materials and Engineering,2013,42(4):785~788.]
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  • Received:April 20,2012
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