B/Al复合材料疲劳断裂机理的显微结构分析

Microstructural Analysis for Fatigue Fracture of B/Al Composites

利用扫描电镜等分析手段对Ｂ／Ａｌ复合材料疲劳断裂的特征及机理进行了分析研究。结果表明，随着应力水平的提高，Ｂ／Ａｌ复合材料的疲劳断口由拔出型趋向于平断型，其断裂机理也有所不同。在同一应力水平下，界面结合较强的试样具有较高的断裂周次。此外，分析结果还表明，纤维在基体中过于密集的或分层的排列，将导致复合材料中纤维的损伤或材料性能的下降。

The fatigue fracture of B/Al composites was investigated with scanning electron microscopy The fractographes were found varying with the stress levels and controlled by different mechanisms The specimen with higher interfacial strength is able to endure more cycles of stress before final fracture The effects of the fiber distribution on the fatigue property were also discussed