SiCp/Mg复合材料的制备及其阻尼特性研究

The Preparation and Damping Capacity of Sicp/Mg Composite Material

中文关键词:  搅拌铸造  SiCp/Mg复合材料  阻尼性能  颗粒

英文关键词:Stir casting  Mg matrix composites  Damping capacities  Particles

中文摘要:

      采用搅拌铸造法在真空度为200 Pa的条件下制备得到含有微量氧化物的SiCp/Mg复合材料,通过显微组织观察和动态热机械分析等对其阻尼特性进行了研究。结果表明,所制备的SiCp/Mg复合材料基体晶界处分布着附着有氧化物的网状结构,且随着SiCp含量的增加,网状结构增多,且分布更加分散。此结构增大了位错密度和晶粒界面滑移,位错脱钉和界面滑移在振动过程中耗能量增大,因此所制备的SiCp/Mg复合材料具有理想的阻尼性能。

英文摘要:

      The SiCp/Mg composites material with oxides were prepared by stir casting method under the condition of vacuum degree of 200 Pa.The damping properties were studied by means of microstructure observation and dynamic mechanical thermal analysis.The results showed that the network structure containing oxides were distributed in the SiCp/Mg matrix.Meanwhile,with the increase of SiCp content,the network structure was more and the distribution was more dispersed.And this structure increased the dislocation density and the grain boundary slip,resulting in the increase of the energy consumption in the vibration process through dislocation breakaway from pinning points and the interface slip.Therefore,the prepared SiCp/Mg matrix composites has the ideal damping property.