SiCp/Al复合材料界面控制与评价新方法

 尝试了一种控制 Si Cp/Al复合材料界面状态与性能的新途径 ,并首次应用声发射检测技术及其信号的小波分析新方法对控制效果进行了系统地评价。结果表明 :界面控制新方法的采用 ,使 Si Cp/Al复合材料损伤、断裂过程中的 Si C颗粒拔出模式发生了转变 ,进而显著提高了材料的整体力学性能 ;小波分析特别适合于提取此类复合材料断裂所致声发射信号的深层特征 ,并可望成为反映颗粒增强金属基复合材料界面区力学行为、评价其界面性能的有效手段

NEW METHOD TO CONTROL AND EVALUATE THE INTERFACE OF SiCp/Al COMPOSITES

A new approach to control the interfacial states and properties of SiCp/Al composites has been attempted. The controlling effect of the interface has been systemically evaluated by using acoustic emission (AE) detection technique and novel wavelet analysis method of AE signals for the first time. The results show that the initial use of the above new method for controlling interface leads to a dramatic transition of SiC particulate pulling out mode during the process of damage or fracture of SiCp/Al composites, which in turn significantly improves the overall mechanical properties of SiCp/Al composites. Wavelet analysis of AE signals promises to be developed as an effective means to reflect interface zone mechanical behaviour and evaluate interface properties of particle reinforced MMCs. As a result, the new signal processing method is specially suitable for extracting the intrinsic features of AE signals produced by the fracture behavior of this class of composites.