TiB2+SiC混杂颗粒增强的ZL109复合材料

在原位合成工艺制备TiB2颗粒增强ZL109复合材料基础上，通过加入SiC颗粒增强铝基复合材料，制备了TiB2＋SiC混杂颗粒增强ZLl09复合材料。结果表明：TiB2颗粒在铝合金熔体中具有良好的悬浮稳定性，而且在TiB2＋SiC混杂颗粒增强铝基复合材料中，由于TiB2颗粒的存在，有效抑制了SiC颗粒的沉降行为，熔体经45min静置仍可获得颗粒分布均匀的复合材料，这使得制备高模量复杂形状零件的直接铸造成型成为可能；在TiB，＋SiC混杂颗粒增强铝基复合材料中，颗粒的混杂作用对复合材料弹性模量的提高具有协同作用，能够大幅度提高复合材料的弹性模量，其弹性模量较计算值提高14．7％；对于（10％TiB2＋10％SiC）／ZL109混杂增强铝基复合材料，经T6热处理后，材料抗拉强度可达到275MPa，弹性模量提高到105．8GPa。

ZL109 composite reinforced by hybrid particles of TiB2 and SiC

Based on in-situ preparation of TiB2 particle reinforced ZL109 composite,hybrid particles of TiB2 and SiC reinforced ZL109 composite were fabricated by adding SiC particle reinforced ZL109 composite.The result shows that TiB2 particles have excellent deposition resistance in the melt aluminum and the deposit velocity of SiC particles is reduced in melt(TiB2+SiC)/ZL109 composite with addition of TiB2 particles.As the hybrid particles have synergetic effect on raising the elastic modulus of composite,the elastic modulus of hybrid particles reinforced composite is much higher than that of the composite reinforced by one kind of particle,and the actual value of elastic modulus is 14.7% higher than calculated value.After T6 heat treatment,the tensile strength of(10%TiB2+10%SiC)/ZL109 composite can reach 275 MPa and the elastic modulus increases to 105.8 GPa.