一种原位TiB2颗粒增强铝基复合材料的制备及特性

摘要

以Al-6Cu-0.2Mg-1Mn合金为基体,采用混合盐原位反应法制备不同TiB2颗粒含量(质量分数分别为1％、3％、5％)的颗粒增强铝基复合材料,对不同处理状态的TiB2颗粒增强复合材料及Al-6Cu-0.2Mg-1Mn合金的相结构与显微组织进行分析,并测试其维氏硬度.结果表明,原位反应生成的TiB2颗粒能改善基体组织,阻止基体晶粒生长的方向性,得到等轴晶;随着增强相TiB2颗粒含量的增加,基体组织得到明显细化;不同处理状态3％及5％含量TiB2颗粒增强复合材料的维氏硬度均显著高于相应Al-6Cu-0.2Mg-1Mn合金的维氏硬度.%Metal matrix composites were fabricated in an Al — 6Cu — 0.2Mg—lMn matrix reinforced by particulates of in —situ TiB2 from reaction process via K2TiF6 and KBF4 salts in the matrix.Different percentage of TiB2, 1%, 3% and 5%, respectively, was employed for the composite.Phases, microstruc-tures and Vickers—hardness were revealed for the differently treated composites and Al—6Cu—0.2Mg— lMn alloy.The results showed that the in—situ TiB2 particulates could improve the structure of the matrix by retarding a directional growth of the matrix grains and forming isometric grains in the matrix.A significant effect on the refinement of the grain was observed when the content of TiB2 particulates was increased.And the Vickers' hardness of the differently treated composites with 3% or 5% TiB2 was higher than that of the corresponding Al —6Cu—0.2Mg—1Mn alloys.