摘要
研究了经制粉→混料→真空抽气→热挤压工艺制备的 6 0 6 6Al SiCp 复合材料的组织特征与阻尼性能 .复合材料的阻尼特征通过动态机械热分析仪 (DMTA)测量 ,得出了 2种不同SiC含量的 6 0 6 6Al SiCp 复合材料及 6 0 6 6Al合金在温度为 30～ 2 5 0℃ ,频率为 0 .1,1,10和 30Hz时的阻尼值 .利用扫描电镜、光学显微镜对复合材料组织特征进行了分析 ,根据组织特征及阻尼数据对复合材料的阻尼机制进行了讨论 .结果表明 :将 2～ 3μm的SiC颗粒加入6 0 6 6Al中 ,当SiC含量为 7% (体积分数 )时 ,增强的SiC颗粒分布较均匀 ,与基体结合良好 ;当SiC含量为 12 %时 ,SiC易聚集成团 .少量SiC能明显提高 6 0 6 6Al的阻尼能力 ,尤其是高温阻尼性能 ;6 0 6 6Al SiCp 复合材料的高阻尼性能主要是SiC颗粒加入后使位错密度大大增加 ,基体晶界及基体与SiC颗粒界面的存在使材料在循环载荷下消耗能量所致 .
Microstructure characteristic and damping properties of the 6066Al/SiC p composites produced by spray powder→blending→canning+degassing→hot pressing process were studied. The damping capacity 6066Al base alloy and the 6066Al/SiC p composites, with two different volume fractions of reinforcements, were measured at frequencies of 0.1, 1, 10 and 30 Hz over in the 30 to 250 ℃ temperature range by a dynamic mechanical thermal analyzer (DMTA). The microstructural analysis was performed using scanning electron microscopy, optical microscopy. It was shown that 2～3 μm SiC particulates gathered easily when the volume fraction of SiC reinforcing particulates present in the MMCs was up to 12%. The damping capacity of 6066Al could be significantly improved by the addition of 7% SiC particulates. Finally, the operative damping mechanisms were discussed in light of characterization of microstructure and the data of damping capacity.
出处
《中南工业大学学报》
CSCD
北大核心
2001年第5期511-514,共4页
Journal of Central South University of Technology(Natural Science)
基金
国家"九五"科技军工配套项目 (中色科技 ( 2 0 0 0 ) 0 0 16 )
关键词
复合材料
铝合金
碳化硅
阻尼能力
composites
Al alloy
silicon carbide
damping capacity
