A12Of＋Cf／ZL109混杂复合材料的常温拉伸强度及预测模型

采用挤压铸造法制备了A12O3f， Cf／ZL109短纤维混杂金属基复合材料，并对该混杂复合材料的常温拉伸强度性能进行了实验及理论分析、在综合考虑纤维长度变化规律、两种纤维在拉伸过程中各自的行为和机理，以及热应力诱发位错强化和纤维弥散硬化等因素对复合材料强度影响的基础上。对复合材料强度预测的混合律模型加以发展和修正，建立了A12O3f， Cf／ZL109短纤维混杂复合材料的常温强度预测模型．利用该模型得到的理论预测值与实验值吻合较好．

Tensile Strength and Its Prediction Model of Al2O3f+Cf/ZL109 Hybrid Composites at Room Temperature

Alumina and carbon short fibers reinforced Al-12 Si aluminum alloy (Al 2O 3f+C f/ZL109) hybrid composites were fabricated by squeeze casting.The tensile strength of the hybrid composites at room temperature was experimentally and theoretically analyzed. The rule-of-mixture (ROM)model to predict the tensile strength of the composite was then developed and modified,based on the effects of comprehensive factors on the property of metal-matrix composites,including the length change regularities of the two fibres,the respective tensile beha-vior and mechanism of the two fibres,the dislocation-strengthening resulting from thermal stress and the dispersion-strengthening of the fibres.Furthermore,a new model was established for the prediction of the tensile strength of the hybrid composites at room temperature.The theoretical tensile strength predicted by the new mo-del agrees well with the experimental results.