Mg对真空压力浸渗SiCp/Al复合材料组织和性能的影响

来源期刊:中国有色金属学报2016年第6期

论文作者:陈以心 王日初 王小锋 彭超群 彭健 孙月花

文章页码:1228 - 1235

关键词:SiCp/Al复合材料;真空压力浸渗;显微组织;物相;力学性能;热导率

Key words:SiCp/Al composite; vacuum pressure infiltration; microstructure; phase; mechanical property; thermal conductivity

摘    要:采用光学显微镜、X射线衍射仪和电子万能试验机等手段研究Mg含量对真空压力浸渗SiCp/Al复合材料组织和性能的影响。结果表明:Mg能提高Al合金的浸渗性能,Mg含量的增加使复合材料致密度升高。Mg促进SiC/Al界面反应的发生,当Mg含量为0~6%(质量分数)时,未观察到明显界面反应产物;当Mg含量为8%时,发生界面反应生成Mg2Si和Al4C3。当Mg含量为0~6%时,由于复合材料致密度的提高及Mg对Al基体的固溶强化作用,导致复合材料强度提高;当Mg含量为8%时,生成的Al4C3降低SiC/Al界面结合力,使复合材料强度下降。当Mg含量为0~4%时,致密度的提高使复合材料热导率上升;当Mg含量为4%~8%时,过量的Mg使Al基体热导率降低,Al4C3的生成使界面热传导受阻,导致复合材料热导率下降。

Abstract: The effect of Mg content on the microstructures and properties of SiCp/Al composites prepared by vacuum pressure infiltration was investigated by optical microscopy, X-ray diffractometer and electronic universal testing machine. The results reveal that the addition of Mg enhances the infiltration ability of Al matrix, leading to the increase of relative densities of composites. The addition of Mg promotes the SiC/Al interface reactions, no obvious reaction products are observed when Mg content is 0-6% (mass fraction), while both Mg2Si and Al4C3 form at Mg content of 8%. The strength of composites increases with the increasing content of Mg when Mg content is among 0-6%, due to the increase of relative densities and strengthening of Al matrix by solid solution hardening. When Mg content is 8%, the formation of Al4C3 leads to the decrease the bonding strength of SiC/Al interfaces, undermining the bonding strength of composites. The thermal conductivity of composites increases with the increasing Mg content when Mg content is 0-4%, because of the increases of relative densities. When Mg content is 4-8%, the thermal conductivity of composites decreases as Mg content increases. It is explained by the combined action of excessive Mg undermining the thermal conductivity of Al matrix and Al4C3 weakening the heat transfer of interfaces.

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