【摘要】 利用透射电镜（ＴＥＭ）动态拉伸技术研究了外力作用下Ａｌ２Ｏ３短纤维增强Ａｌ－５．５Ｚｎ基复合材料的细观力学行为。结果表明，该材料中裂纹形核及扩展主要是在基体中或纤维／基体界面处进行。导致这一结果的原因在于纤维、基体之间强度差异太大。实验中还发现，卸载时，微裂纹有闭合现象。更多还原

【Abstract】 Microcracking characteristics of Al 2O 3 short fibre reinforced Al 5.5Zn matrix composite were studied using a dynamic tensile technique of transmission electron microscopy (TEM). The results show that the nucleation and propagation of cracks occur mainly in the matrix and fibre/matrix interface region. This may result from the great difference in strength between the fibre and matrix. Also, it has been observed that the microcrack can close in the unloading process.更多还原