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用挤压铸造工艺获得了拉伸强度较高并且强度数据分散度较小的莫来石纤维／ＺＬ１０９复合材料。用Ｗｅｉｂｕｌ方法分析该复合材料的拉伸强度值的分布状况，得到比较大的Ｗｅｉｂｕｌ模量。统计分析了复合材料中纤维体积分数和拉伸断口面上的纤维体积分数。结果表明，纤维的分布在宏观上是随机的而在微观上是不均匀的，与观察面法线呈小角度的纤维体积分数同与观察面法线成大角度的纤维体积分数比较接近；在断口面上与拉伸方向呈大角度的纤维体积分数同与拉伸方向呈小角度的纤维体积分数相差较大。认为该复合材料破坏的主要原因在于与拉伸方向呈大角度的纤维与基体的界面脱粘。拉伸强度数据分散的原因在于微观上与拉伸方向呈大角度的纤维分布的不均匀。
A mullite fiber / ZL109 composite material with higher tensile strength and less intensity data dispersion was obtained by the squeeze casting process. The Weibul method was used to analyze the distribution of the tensile strength of the composite to obtain a relatively large Weibul modulus. The fiber volume fraction in the composite and the fiber volume fraction on the tensile fracture surface were statistically analyzed. The results show that the fiber distribution is macroscopically random and microscopically non-uniform. The volume fraction of fibers with a small angle to the normal of the observation surface is close to the fiber volume fraction at a large angle with the normal to the observation surface. The volume fraction of fibers with a large angle to the direction of stretch at the fracture surface differs significantly from the volume fraction of fibers at a small angle to the direction of stretch. It is considered that the main reason for the damage of the composite material is that the interface between the fiber and the substrate at a large angle with respect to the stretching direction debonds. The reason for the dispersion of the tensile strength data lies in the non-uniform distribution of the fibers at a large angle microscopically to the stretching direction.