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用挤压铸造工艺得到了拉伸强度比较高并且强度数据分散度比较小的莫来石纤维/ZL109复合材料。用Weibull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Weibull模量。统计分析了复合材料金相面上的纤维体积分数和拉伸断口面上的纤维体积分数,结果表明,纤维的分布在微观上是不一致的;在金相面上,与观察法线呈中角度的纤维体积分数Afs同与观察法法线成大角度的纤维体积分数Af1比较接近;在拉伸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是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面呈大角度的纤维分布的不均匀。
A mullite fiber / ZL109 composite material with high tensile strength and low intensity data dispersion was obtained by the squeeze casting process. The Weibull method was used to analyze the distribution of the tensile strength value of the composite to obtain a relatively large Weibull modulus. The fiber volume fraction on the metallographic surface and the fiber volume fraction on the tensile fracture surface are statistically analyzed. The results show that the distribution of the fibers is inconsistent microscopically. On the metallographic surface, Fiber volume fraction Afs with the observation of law at a large angle into the fiber volume fraction Af1 closer; tensile fracture surface at a large angle with the fiber volume fraction of the fiber with a small angle with the direction of elongation of the fiber volume The scores vary greatly. The main reason for the failure 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 tensile strength data lies in the non-uniform distribution of the fibers at a large angle microscopically to the stretching.