SiC_f/Ti-6Al-4V基复合材料界面晶格常数变化的CBED研究

Study on the changes of lattice parameters at interface in SiC_f/Ti-6Al-4V composite

本实验采用会聚束电子衍射(CBED)方法,研究3种不同状态SiCf/Ti-6Al-4V复合材料界面附近α-Ti晶粒的晶格常数变化。结果表明:在纤维-基体界面区域,靠近界面处晶格常数变化较大,随距界面反应层距离增大,晶格常数的变化趋近缓慢。有C涂层SiC纤维制成的复合材料中晶格常数变化比无C涂层复合材料晶格常数变化小。相比制备态复合材料,热暴露无C涂层SiCf/Ti-6Al-4V复合材料界面处,晶格常数变化较为缓和。

The changes of lattice parameters at interface in SiCf/Ti-6Al-4V composites with different interface structure were studied by using convergent beam electron diffraction（CBED） in this paper.The results show that,for all lattice parameters,there are sharp changes near the interface.And the changes become smaller with the increasing of the distance from the interface.Furthermore,the changes of lattice parameters in the composites reinforced with C coated fibers are lower than those reinforced without C coated fibers.Compared with the changes of lattice parameters in as-processed composite,they are more gradual in heat treated composite.