纤维长度和体积分数对Al_2O_3-SiO_2/Al-Si微屈服行为的影响

Effect of length and volume fraction of the reinforcing fibers on micro yield behaviors of Al_(2)O_(3)-SiO_(2)/Al-Si metal matrix composites

以通过浸渗挤压工艺制备的Al2O3-SiO2/Al-Si复合材料为研究对象,使用配备有精度达10-7位移测量装置的Instron5569电子拉伸试验机,并采用连续加载法,详细研究了晶化硅酸铝短纤维的体积分数和短纤维长度对铝硅基复合材料微屈服行为的影响规律,并定性分析了原因。结果表明:随着晶化硅酸铝短纤维体积分数的逐渐增大,铝硅基复合材料的微屈服强度逐渐减小,但其宏观屈服强度和弹性模量却逐渐增大;随着晶化硅酸铝短纤维长度的逐渐增加,铝硅基复合材料的微屈服强度逐渐减小,但其宏观屈服强度却逐渐增大。

The effects of volume fraction of alumina silicate short fibers in crystal and their length on micro yield behaviors of Al2O3-SiO2/Al-Si（sf）/Al-Si metal matrix composites （MMCs） fabricated with squeezing cast were investigated by continuous loading on an Instron5569 tester with measuring installation of accuracy 10^-7. It is shown that the micro yield strength of the MMCs decreases while the macro yield strength and Young＇s modulus increase when the volume fraction of alumina silicate short fibers increases and the micro yield strength of the MMCs decreases while the macro yield strength increases when the length of the short fibers in crystal increases.