(上海交通大學(xué) 金屬基復(fù)合材料國家重點實驗室，上海 200030)
摘 要: 在原位合成工藝制備TiB2顆粒增強ZL109復(fù)合材料基礎(chǔ)上，通過加入SiC顆粒增強鋁基復(fù)合材料，制備了TiB2+SiC混雜顆粒增強ZL109復(fù)合材料。結(jié)果表明：TiB2顆粒在鋁合金熔體中具有良好的懸浮穩(wěn)定性，而且在TiB2+SiC混雜顆粒增強鋁基復(fù)合材料中，由于TiB2顆粒的存在，有效抑制了SiC顆粒的沉降行為，熔體經(jīng)45 min靜置仍可獲得顆粒分布均勻的復(fù)合材料，這使得制備高模量復(fù)雜形狀零件的直接鑄造成型成為可能；在TiB2+SiC混雜顆粒增強鋁基復(fù)合材料中，顆粒的混雜作用對復(fù)合材料彈性模量的提高具有協(xié)同作用，能夠大幅度提高復(fù)合材料的彈性模量，其彈性模量較計算值提高14.7%；對于(10%TiB2+10%SiC)/ZL109混雜增強鋁基復(fù)合材料，經(jīng)T6熱處理后，材料抗拉強度可達到275 MPa，彈性模量提高到105.8 GPa。
關(guān)鍵字: ZL109復(fù)合材料；原位合成；攪拌鑄造；混雜增強
of TiB2 and SiC
（State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200030, China）
Abstract: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.
Key words: ZL109 composite; in-situ reaction; stir casting; hybrid reinforcement
