挤压铸造颗粒增强金属基复合材料过程中液态金属浸渗和传热行为的分析

Liquid Metal Infiltration and Transfer Heat Behavior for Particles Reinforced Metal Matrix Composites

挤压铸造颗粒增强金属基复合材料（ＭＭＣｓ）过程中，挤压压力、熔体的预热温度、预制件的体积分数、颗粒的半径等都将对压力浸渗效果乃至最终复合材料的力学性能产生深刻的影响．分析了挤压铸造ＭＭＣｓ过程中液态金属浸渗和传热行为，推导出挤压铸造ＭＭＣｓ过程中，液态金属浸渗规定深度所需要的时间，随着无量纲压力Φ的增大，浸渗所需的时间τ＊缩短；但当Φ值很大时，Φ的升高使τ＊的减少不明显．建立了挤压铸造ＭＭＣｓ过程中液态金属浸渗区和未浸渗区的温度平衡方程，并求出了差分解．

During the process of squeeze cast particles reinforced metal matrix composites, squeeze pressure, preheating temperature of the melt, volume fraction of preform and particle radius seriously affect the infiltration result and the mechanical properties of the composites. The paper analyzed the liquid metal infiltration and transfer heat behavior in the process of squeeze cast particles reinforced metal matrix composites, deduced the relation of the necessary time that liquid metal infiltrates the fixed depth perform. With the increase of Φ , the necessary time τ * of infiltration is shorted; but when the Φ value is higher, as the Φ increases, τ * is hardly altered. In the process of squeeze cast particles reinforced metal matrix composites, the temperature equilibrium equations of infiltration zone were established and solved.