原位TiB_2/A356铝基复合材料的微观组织和阻尼性能

Microstructure and Damping Behavior of In-situ TiB_2/A356 Aluminum Matrix Composites

为了获得具有良好显微组织和内耗性能的TiB2增强铝基复合材料,通过混合盐法制备了原位TiB2颗粒增强A356复合材料。采用扫描电镜、光学显微镜和X射线衍射仪等对所制备的复合材料进行了表征,并对其阻尼性能进行了研究。结果表明,原位TiB2颗粒在基体中分布均匀,平均尺寸在300nm左右,TiB2颗粒对α-Al晶粒有显著的细化效果,复合材料的强度、弹性模量以及阻尼性能都明显高于基体合金。

In order to obtain Al based composites with favorable microstructure and high damping behavior,in-situ TiB2/A356 aluminum matrix composites were fabricated by the mixed salts method. Microstructure and composition of the composites were analyzed by SEM (scanning electron microscope),OM (optical microscope) and XRD (X-ray diffraction),and damping behavior was examined. The results show that TiB2 particle with approximately 300 nm in average grain size are uniformly distributed into the matrix,exhibiting apparent refinement for primary grain size,which results in the strength,modulus and damping of the composites superior greatly to those of the matrix alloy.