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研究了粉末冶金法制备 6 0 6 6铝合金及增强相 Si Cp(尺寸 3μm )含量为 7% ,12 % (体积 )的 6 0 6 6铝合金复合材料的拉伸断口及阻尼特性。复合材料的阻尼性能通过动态机械热分析仪测量 ,得出了增强相 Si Cp体积分数不同的两个6 0 6 6 Al/ Si Cp复合材料及 6 0 6 6铝合金在 1Hz及 30～ 2 5 0℃的温度范围的阻尼温度关系。结果表明 ,当增强相含量体积为7%时 ,Si Cp颗粒分布均匀 ,与基体结合良好 ,复合材料的破坏归因为增强相周围的铝基体产生孔洞形核、长大、聚合引起的 ;增强相体积含量为 12 %时 ,Si Cp聚集成团 ,复合材料的破坏则归因为 Si Cp团块形成裂纹而断裂。少量 Si Cp(7% )明显提高 6 0 6 6 Al合金阻尼性能 ,尤其是高温阻尼性能。但 Si Cp含量再增加到 12 %没有效果 ,6 0 6 6 Al/ Si Cp复合材料的高阻尼性能主要是因为 Si Cp颗粒加入后增加的高密度位错及基体与 Si Cp颗粒的界面消耗能量
The tensile fracture and damping characteristics of 6 0 6 6 aluminum alloy composites prepared by powder metallurgy method and 6 6 6 aluminum alloy reinforced phase Si Cp (size 3μm) of 7% and 12% were studied. The damping properties of the composites were measured by a dynamic mechanical thermal analyzer. The results showed that the two composites with different volume fraction of reinforcing phase Si Cp and the 6 0 6 6 aluminum alloy with 6 0 6 6 aluminum alloy at 1Hz and 30 ~ 25 0 ℃ temperature range of the damping temperature relationship. The results show that when the phase content is 7%, the Si Cp particles are uniformly distributed and well bonded with the matrix. The failure of the composites is attributed to the nucleation, growth and polymerization of the aluminum matrix around the reinforcing phase. When the volume fraction is 12%, Si Cp aggregates into clusters, and the failure of the composites is attributed to the formation of cracks in the Si Cp clusters. A small amount of Si Cp (7%) significantly improves the damping properties of the 6 0 6 6 Al alloy, especially the high temperature damping properties. However, the Si-Cp content increased to 12% with no effect. The high damping capacity of the 6 0 6 6 Al / Si Cp composite was mainly due to the increased density dislocations and the interface energy consumption of Si Cp particles