论文部分内容阅读
研究了含量为20%的SiC颗粒增强ZL111铝基复合材料锭重熔后,挤压铸造件的组织和性能。结果表明,可以采用卧式挤压铸造方法制备铝基复合材料铸件,浇注温度为710℃,挤压冲头速度为0.4m/s,比压为135MPa;组织内SiC颗粒分布仍然保持分散,没有发生团聚,铸件不同部位SiC含量基本一致;但是SiC颗粒只分布在共晶组织内;铸件耐磨性显著提高,导致切削加工刀具磨损急剧增加,但布氏硬度(HB)为76.7～94.4,与ZL111铝合金相差不多。
The microstructure and mechanical properties of ZL111 aluminum matrix composite with 20% SiC particles reinforced by squeeze casting were investigated. The results show that the cast-in-place aluminum matrix composites can be prepared by horizontal squeeze casting. The pouring temperature is 710 ℃, the extrusion punch speed is 0.4m / s and the specific pressure is 135MPa. The distribution of SiC particles in the microstructure still remains dispersed. However, the SiC particles distributed only in the eutectic structure. The wear resistance of the castings increased significantly, resulting in a sharp increase of the cutting tool wear. However, the Brinell hardness (HB) was 76.7-94.4, which was in agreement with that of the castings ZL111 aluminum alloy is almost the same.