材料期刊网

采用增强体颗粒预处理和机械合金化技术成功制备了高性能 B4Cp/Al 复合材料，研究了材料的微观组织结构和力学性能。17%(体积分数) B4Cp/6061Al 复合材料的屈服强度为 415 MPa，抗拉强度为 470 MPa，比常规粉末冶金复合材料的屈服强度和抗拉强度分别提高 69% 和 70%。高性能复合材料中 B4C 颗粒形貌近似球形，平均粒度为 0.49 μm，颗粒均匀分布，颗粒与基体之间存在近百纳米厚的界面层，界面层中铝晶粒极其微细，呈带状且有序分布，并且界面层中弥散分布着纳米级颗粒。断口中增强体颗粒与基体之间界面结合良好。

High performance B4C particulates reinforced aluminum matrix composites were successfully fabricated by powder metallurgy techniques including the surface treatment of B4C particulates and mechanical alloying. Microstructure and mechanical properties of high performance B4Cp/Al were investigated. The results indicate that, the yield and ultimate tensile strengths of 17vol% B4Cp/6061Al composites are 415MPa,470MPa,and increase by a factor of 69% and 70% respectively, compared with those of 17vol% B4Cp/6061Al fabricated by the common powder metallurgy without the surface treatment of B4C particulates and mechanical alloying. The microstructural analysis show that, B4C particulates are near-round, particulate mean size d50 is 0.49 μm, spatial distribution of B4C particulates in the matrix is uniform, and there exist the interface zone between B4C particulates and Al matrix, which is composed of much small banding Al grains with ordered distribution and particle-like substances with nanometre size. SEM fractographs show that there are good bonding interface between B4C particulates and Al matrix.