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采用金相显微镜、X射线衍射仪、扫描电镜及能谱仪对纤维涂层法结合真空热压工艺制备的SiCf/Ti-43Al-9V复合材料基体微观组织的形成进行研究。结果表明,磁控溅射法制备的γ-TiAl涂层与纤维结合良好,与靶材成分基本一致,涂层呈柱状晶生长并且在生长过程中没有发生明显粗化;SiCf/Ti-43Al-9V复合材料基体是由γ相、α2/γ片层组织和B2相组成,与原始靶材合金的相组成一样。复合材料基体中的B2相在离纤维较远处出现,其V含量比原始靶材合金中B2相的低。B2相的分布与热压过程中纤维中C的扩散密切相关。
The microstructure of SiCf / Ti-43Al-9V composite prepared by fiber coating method and vacuum hot pressing process was studied by means of metallographic microscope, X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The results show that the γ-TiAl coating prepared by magnetron sputtering has a good combination with the fiber, which is basically consistent with the composition of the target, the columnar crystal growth and no significant coarsening of the coating during the growth; SiCf / Ti-43Al- 9V composite matrix is composed of γ phase, α2 / γ lamellar structure and B2 phase, the same as the original target alloy phase composition. The B2 phase in the composite matrix appears farther from the fiber and has a lower V content than the B2 phase in the original target alloy. The distribution of B2 phase is closely related to the diffusion of C in the fiber during hot pressing.