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自生Ti2AlC/TiAl复合材料的组织及反应过程
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国家自然科学基金(51001086)


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

    采用自蔓延燃烧合成及真空电弧熔炼的方法,以碳纤维(Cf)、钛粉及铝粉为原料,合成了Ti2AlC/TiAl复合材料。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)分析了复合材料的物相组成和微观结构,讨论了原位合成Ti2AlC的反应和二次Ti2AlC的析出过程。结果表明,复合材料铸锭由Ti2AlC、TiAl和Ti3Al 3相组成,基体由α2(Ti3Al)+γ(TiAl)片层和γ(TiAl)等轴晶粒构成,原位自生的Ti2AlC分布均匀,呈短纤维状或颗粒状。1200 ℃均匀化热处理促使Ti3Al分解为TiAl和Ti2AlC,导致Ti2AlC粗化,同时基体表面析出细小的二次Ti2AlC颗粒。

    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 辉,胡 锐,张铁邦,李金山.自生Ti2AlC/TiAl复合材料的组织及反应过程[J].稀有金属材料与工程,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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