Damping capacities and microstructures of magnesium matrix composites reinforced by graphite particles
Damping capacities and microstructures of magnesium matrix composites reinforced by graphite particles
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DOI：
10.1016/j.matdes.2010.05.033
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发表时间：
2010-12-01
影响因子：
8.4
通讯作者：
Hu, X. S.
中科院分区：
文献类型：
--
作者：
Wu, Y. W.;Wu, K.;Hu, X. S.
采用搅拌铸造法制备了石墨颗粒尺寸为50µm、石墨颗粒体积分数分别为5%、10%、15%和20%的石墨颗粒增强镁基复合材料。利用动态力学分析仪对铸态复合材料的阻尼性能进行了测试。实验结果表明，石墨颗粒对铸态复合材料的减振性能有重要影响。随着石墨颗粒体积分数从0%增加到15%，铸态复合材料的应变幅值无关阻尼显著增加，当石墨颗粒体积分数超过15%时，应变幅值无关阻尼显著降低。铸态复合材料的阻尼值从室温到125℃随温度的升高而缓慢上升，从125℃到250℃随温度的升高没有明显变化，但从250℃到400℃随温度的升高而迅速上升。(C)2010爱思唯尔有限公司版权所有。
Magnesium matrix composites reinforced by graphite particles were fabricated using stir casting with graphite particle size of 50 mu m and graphite particle volume fractions of 5%, 10%, 15% and 20%, respectively. A dynamic mechanical analyzer was used to measure the damping capacities of as-cast composites. The experimental results reveal that the graphite particles play an important role on the damping capacities of as-cast composites. The strain amplitude independent damping of as-cast composites increases significantly as the graphite particle volume fraction increases from 0% to 15%, but decreases when the volume fraction exceeds 15%. The damping values of as-cast composites rise slowly with increasing temperature from room temperature to 125 degrees C, and have no obvious change with increasing temperature from 125 degrees C to 250 degrees C, but rise rapidly with increasing temperature from 250 degrees C to 400 degrees C. (C) 2010 Elsevier Ltd. All rights reserved.