共查询到18条相似文献,搜索用时 837 毫秒
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SiCp/LY12铝基复合材料的阻尼行为 总被引:4,自引:0,他引:4
研究了SiCp/LY12铝基复合材料及基基体铝合金的阻尼行为,发现随温度升高,铭基复合材料的阻尼性能显著增加,优于铝合金,并且增强物含量越多,合复合材料的阻尼性能越好。研究认为位错阻尼和界面阻尼是提高复合材料阻尼性能的原因。 相似文献
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《中国新技术新产品》2016,(15)
颗粒增强镁基复合材料凭借其优良的比强度、比刚度、耐磨性、耐高温、减震性能以及优异的阻尼性能和电磁屏蔽性能等,作为功能材料被广泛地应用在电子、航空、航天特别是汽车工业等行业中。本文主要对颗粒增强镁基复合材料专利申请中专利申请的国内外的年度变化趋势、申请人类型进行分析,并总结了颗粒增强镁基复合材料专利申请中增强颗粒类型以及其专利技术改进方向。 相似文献
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《材料研究学报》2017,(1)
使用表面化学镀镍的短碳纤维为增强体、AZ91D粉为基体金属,用粉末冶金法和热挤压工艺制备镁基复合材料,用SEM、TEM-EDS、拉伸和动态热机械分析(DMA)等手段表征其微观形貌、界面结构、力学性能和阻尼性能,研究了金属镍涂层短碳纤维对AZ91D镁基复合材料的界面和阻尼性能的影响。结果表明,碳纤维在复合材料中分布均匀,沿着挤压方向定向排列;镍涂层改善了碳纤维与AZ91D基体之间的润湿性;不同频率的应变谱和G-L特征线都表明:复合材料的阻尼机制,除了位错之外还有其他机制;随着应变频率的提高复合材料的阻尼机制由以界面滑移为主转变为以位错为主。随着温度的升高涂层碳纤维增强镁基复合材料的阻尼容量增大,在250~300℃出现一个阻尼峰。随着频率的提高阻尼峰值的温度移向高温,表现出热激活弛豫过程的特征,根据Arrhenius公式计算出其热激活能(H)为3.448 e V。 相似文献
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非连续物增强轻金属复合材料研究现状及展望 总被引:13,自引:0,他引:13
综述了非连续物增强轻金属复合材料的研究进展,着重介绍了各种非连续物增强铝、镁、钛基复合材料的发展背景、组成、工艺方法和性能特点,并对其发展前景进行了分析。 相似文献
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《Materials Science & Technology》2013,29(11):1389-1396
AbstractThe objective of the present work was to investigate the effect of presence of SiC reinforcement and the vibration frequency on the overall damping characteristics of pure magnesium. The testing method uses a combination of the modified free – free beam method coupled with a circle fit approach. The effect of frequency on the damping property was studied by adding end masses to the specimen so as to alter the resonant frequency of the suspended beam. In the present study, the results are compared against a monolithic magnesium sample. The results revealed a higher damping capability of the composite specimen at all tested frequencies when compared to monolithic magnesium. Both monolithic and reinforced magnesium showed a progressive decrease in damping with an increase in frequency. An attempt is made to rationalise the damping behaviour of the composite in terms of the presence of a process induced plastic zone at the matrix/particulate interface and the operating frequency. 相似文献
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《Composites Science and Technology》2007,67(3-4):720-727
Magnesium matrix composites reinforced with 8 wt% TiC was in situ synthesized using remelting and dilution technique. X-ray diffraction analysis revealed the presence of TiC phase in sintered block and magnesium matrix composites. Uniform distribution of fine TiC particulates in matrix material was obtained through microstructure characterization. The results of damping characterization revealed that damping capacity of materials is independent of frequency, but dependent on strain and temperature. There were damping peak in damping–strain curve, which is due to the foul and tangle of dislocations. There were two damping peaks at damping–temperature curve under respective temperature of 130 °C and 240 °C. The former damping peak of magnesium matrix composites is due to dislocation motion, and the latter is due to interface and grain boundary sliding. Generally, damping capacity of magnesium matrix composites is higher than that of AZ91 magnesium alloy, which is due to the addition of TiC particulates. 相似文献
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C J XIAO 《Bulletin of Materials Science》2016,39(2):463-467
To study the damping capacity of BaTiO3/Al composites, Al composites reinforced with BaTiO3 powder (average grain sizes: 100 and 1000 nm) were fabricated by the hot-pressing sintering method. The damping properties of pure Al and BaTiO3/Al composites were investigated and compared based on the dynamic mechanical analysis over a wide range of temperatures (50–285°C). Compared with pure Al matrix, 1000 nm BaTiO3/Al composites with 5 and 10% mass fractions of BaTiO3 exhibited better damping capacity. For 100 nm BaTiO3/Al composite, its damping capacity is slightly higher than that of pure Al below 145°C, while it becomes lower above this degree. The damping capacity enhancement of BaTiO3/Al composites can be explained by the ferroelastic domain damping. Furthermore, 5 and 10% BaTiO3/Al composites have higher bending strength and hardness than pure Al sample. 相似文献