原位合成TiB2 /Al-7Si复合材料的微观组织及强化机理
Microstructure and Reinforcing Mechanism of In-situ TiB2 / Al-7Si Composites
赵火平, 尧军平, 谭艳军, 张 磊
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作者单位：南昌航空大学 材料科学与工程学院, 江西 南昌 330063
中文关键字：Al-Si合金； TiB2； 原位合成； 微观组织； 强化机理
英文关键字：Al-Si alloy; TiB2; in-situ reaction; microstructure; strengthening mechanism
中文摘要：采用混合盐法制备了TiB2/Al-7Si复合材料，对复合材料的微观组织进行了观察，并对其力学性能进行了测试。结果表明：原位生成的TiB2颗粒平均尺寸约 400 nm，在复合材料中分布均匀；TiB2颗粒对α-Al和共晶Si都具有显著的细化效果；复合材料的力学性能较其基体有明显的提高；基体晶粒的细化及TiB2颗粒的弥散分布是复合材料的主要强化机制。
英文摘要：TiB2/Al-7Si composite was synthesized by salt reaction route. The microstructure of the composite was observed, and the mechanical properties were also tested. The results show that in-situ TiB2 particles have the average size of about 400 nm, and uniformly disperse in the matrix. TiB2 particles have a significant effect on the refinement of primary α-Al and eutectic Si. The mechanical properties of the composites are better than that of the matrix . Matrix grain refining and dispersive distribution of TiB2 particles are the main strengthening mechanisms.