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用挤压铸造法制备不同ZnO包覆量的硼酸镁晶须增强的6061铝基复合材料,并对其进行热挤压处理。对复合材料的显微组织及其力学性能进行研究。结果表明:随着ZnO包覆量的增大,铸态复合材料的弹性模量直线增加。铸态复合材料的极限抗拉强度和屈服强度随ZnO包覆量的增大先增大后减小。然而,铸态复合材料的伸长率基本一致。经挤压后,复合材料的伸长率大幅增加;无涂层复合材料的极限抗拉强度最大,且其弹性模量有所提高。涂覆ZnO涂层的复合材料中晶须发生明显的折断现象。但是,随着ZnO包覆量的增大,晶须的破坏程度有限。
6061 aluminum matrix composites reinforced with different amount of ZnO coated with magnesium borate whiskers were prepared by extrusion casting and hot-pressed. The microstructure and mechanical properties of the composites were studied. The results show that the elastic modulus of as-cast composites increases linearly with the increase of ZnO coating. The ultimate tensile strength and yield strength of as-cast composites increase first and then decrease with the increase of ZnO coating. However, the elongation of the as-cast composites is basically the same. After extrusion, the elongation of composites increases greatly; the ultimate tensile strength of uncoated composites is the largest and its modulus of elasticity is increased. Whiskers in the ZnO-coated composites show a significant breaking phenomenon. However, with the increase of ZnO coating, whisker damage is limited.