利用电子显微镜研究了ＳｉＣ纤维增强的钛合金基复合材料的显微结构，结果表明，复合材料的增强相为直径１２０μｍ左右并含有１５μｍ钨芯的柱状纤维，β－ＳｉＣ针状枝晶沿径向生长，其（１１１）面垂直于枝晶生长方向并含有大量的层错和微孪晶。纤维与基体结合得很理想，界面非晶保护层在材料复合过程中未受损失。在材料复合过程中，纤维边缘少量的ＳｉＣ枝晶高温分解并经非晶层扩散到基体与Ｔｉ反应而生成ＴｉＣ和Ｔｉ５Ｓｉ３
The study of Ti alloy based composite reinforced by SiC fibers showed that SiC dendrites grew along the radial directions peprendicular to the tungsten core; many stacking faults and microtwins were formed within the dendrites; SiC fibers bond well to the matrix, and the amorphous interfacial layers between them have not been damaged during composition. In the course of composition SiC dendrites near the interfacial region dissolved and diffused into the amorphous layer and reacted with the Ti alloy matrix at high temperature, producing TiC and Ti5Si3 . Correspondent. LI Douxing, professor, Institute of.Metal Research, Chinese Academy of Sciences, Shenyang 110015
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