摘要
运用空气加压渗流技术制备了宏观石墨颗粒增强的工业纯铝金属基复合材料，在25～400℃温度范围和频率为0．5、1．0和3．0Hz条件下在多功能内耗仪上测量了材料的内耗和相对动力学模量；用透射电子显微镜对材料的微观结构进行了观察。依据内耗测量和微观分析研究了宏观石墨颗粒增强工业纯铝金属基复合材料的位错阻尼行为。结果表明，在频率0．5～3．0Hz范围内，复合材料的阻尼与致密工业纯铝的阻尼相比较，阻尼性能提高2～3倍。复合材料阻尼能力随着石墨颗粒体积分数的增加而增加，但相对动力学模量在减小，材料的位错阻尼是一种重要的阻尼机制。
Macroscopic graphite （Gr） particulates reinforced commercially pure aluminum （A1） metal matrix composites （MMCs） were prepared by air pressure infiltration process. The internal friction （IF） and relative dynamic modulus were measured by muhifunction internal friction apparatus （MFIFA） at frequencies of 0.5, 1.0 and 3.0 Hz in the temperature range of 25 -400 ℃. The mierostructure analysis was performed using transmission electron microscopy （TEM）. Dislocation damping behavior of the macroscopic graphite particulates reinforced commercially pure aluminum MMCs was studied based on the IF measurement and mierostructure analysis. The results showed that in the frequency range of 0.5 - 3.0 Hz damping performance of the composite was raised 2 - 3 times compared to that of compact commercially pure aluminum. With the increase of volume fraction of graphite particles, the damping capacity increases while the dynamic modulus decreases. Dislocation damping is an important damping mechanism of materials.
出处
《矿冶工程》
CAS
CSCD
北大核心
2009年第3期91-94,共4页
Mining and Metallurgical Engineering
基金
江西省自然科学(青年)基金项目(0550050)
江西省教育厅科研项目(13-3-B-04)
关键词
复合材料
位错阻尼
内耗
石墨颗粒
工业纯铝
composites
dislocation damping
internal friction
graphite particulate
commercially pure aluminum
作者简介
魏健宁（1973-），男，甘肃天水人，副教授，博士，主要从事材料阻尼机理的研究。
