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自生Ti2AlC/TiAl復(fù)合材料的組織及反應(yīng)過程
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國家自然科學(xué)基金（51001086）


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

    采用自蔓延燃燒合成及真空電弧熔煉的方法，以碳纖維（Cf）、鈦粉及鋁粉為原料，合成了Ti2AlC/TiAl復(fù)合材料。通過X射線衍射(XRD)、掃描電子顯微鏡(SEM)和透射電子顯微鏡(TEM)分析了復(fù)合材料的物相組成和微觀結(jié)構(gòu)，討論了原位合成Ti2AlC的反應(yīng)和二次Ti2AlC的析出過程。結(jié)果表明，復(fù)合材料鑄錠由Ti2AlC、TiAl和Ti3Al 3相組成，基體由α2(Ti3Al)+γ(TiAl)片層和γ(TiAl)等軸晶粒構(gòu)成，原位自生的Ti2AlC分布均勻，呈短纖維狀或顆粒狀。1200 ℃均勻化熱處理促使Ti3Al分解為TiAl和Ti2AlC，導(dǎo)致Ti2AlC粗化，同時基體表面析出細(xì)小的二次Ti2AlC顆粒。

    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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曾凌霄,常 輝,胡 銳,張鐵邦,李金山.自生Ti2AlC/TiAl復(fù)合材料的組織及反應(yīng)過程[J].稀有金屬材料與工程,2013,42(4):785~788.[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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  • 收稿日期:2012-04-20
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