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采用挤压铸造成功制得界面结合良好的“Saffil”（TM）δ－Al2O3短纤维增强Al－12Si－Cu复合材料。用扫描电镜对材料的室温拉伸断口和原位动态拉伸过程的观察及分析结果表明：纤维断裂和界面脱粘共同导致材料失效。主裂纹在材料中萌生后，在裂纹尖端区形成明锐的应力集中，造成裂纹前沿与拉伸方向呈小角度（0°＜θ＜45°）排列的纤维正断，而呈大角度（45°＜θ＜90°）排列的纤维则基本沿界面脱开形成微裂纹，成为主裂纹发展的路径。基体中无剪切屈服现象出现。
The “Saffil” (TM) δ-Al2O3 short fiber-reinforced Al-12Si-Cu composites with good interfacial bonding were successfully fabricated by extrusion casting. Scanning electron microscopy observations of the material at room temperature tensile fracture and in-situ dynamic tensile process results show that: the fiber fracture and interfacial debonding together lead to material failure. After the initiation of the main crack in the material, a sharp stress concentration was formed in the tip region of the crack, resulting in a normal fiber fracture with a small angle (0 ° <θ <45 °) and a large angle (45 ° <Θ <90 °) arranged along the fiber is basically along the interface to form micro-cracks, as the main crack development path. There is no shear yielding in the matrix.