SiC_p/AZ61镁基复合材料的力学与阻尼性能

Mechanical properties and damping capacity of AZ61 magnesium alloy matrix composites with SiC particulates

采用搅熔铸造法制备碳化硅颗粒增强镁基复合材料SiCp/AZ61,通过拉伸实验、动态机械热分析和显微组织观察等方法研究了其机械性能与阻尼性能。结果表明,在室温下碳化硅颗粒的加入使基体晶粒明显细化,镁基复合材料的性能与AZ61合金相比得到了显著的改善,其阻尼的提高可以用G-L位错钉扎模型解释。由于碳化硅颗粒的加入使基体中界面数量增加,高温情况下更加容易发生界面滑移,材料的阻尼性能有明显提高。

SiC particulate reinforced magnesium matrix composite SiCp/AZ61 was fabricated by using stirring-melt casting technique. The mechanical and the damping properties of the composites were studied by tensile test, dynamic mechanical thermal analysis and micro-structural observation. The results show that after introducing SiC particles, matrix grains were refined obviously at room temperature and the properties of magnesium matrix composites were improved comparison to AZ61 alloy. Meanwhile, the improvement of damping properties can be explained by G-L dislocation pinning theory. The damping characterization was explained with the increasing of quantities of the grain-bound- aries for the introducing of SiC particles, and the ease of interface slipping in high temperature.