The debonding behaviour at the fibre/matrix interface in a unidirectional continuous carbon-coated SiC fibre reinforced Ti-17 composite was investigated. Single fibre push-out testing on thin slice specimen by micro-indentation was employed to evaluate the interface debonding strength. In order to investigate interface debonding modes, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilised to observe the microstructure at the fibre/matrix interface region after the fibres were pushed out. It is found that the interface debonding strength is evaluated to be 108.2 MPa in the composite. The interface debonding occurs at the interface between the interface reaction zone (RZ) and the carbon coating on the fibre surface. The carbon coating/SiC fibre interface and the RZ/matrix interface remain intact after the fibre was pushed out.

研究了单向连续碳涂层 SiC 纤维增强 Ti-17 复合材料中纤维/基体界面的脱粘行为。采用微压痕对薄片试样进行单纤维推出测试来评估界面脱粘强度。为了研究界面脱粘模式，利用扫描电子显微镜（SEM）和透射电子显微镜（TEM）观察纤维被推出后纤维/基质界面区域的微观结构。发现复合材料的界面剥离强度评估为108.2 MPa。界面脱粘发生在界面反应区 (RZ) 和纤维表面碳涂层之间的界面处。