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Study of Damping Capacity and Its Mechanism of Magnesium Alloys

Author: TaoYanLing
Tutor: PanFuSheng
School: Chongqing University
Course: Materials Science
Keywords: Magnesium alloy Damping Damp Mechanism
CLC: TG135
Type: Master's thesis
Year: 2004
Downloads: 519
Quote: 3
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Abstract


Magnesium alloys have excellent casting performance and damping properties. However, the damping effect of the magnesium alloy material has to reduce vibration and noise reduction, still not attracted enough attention and in-depth study of the engineering sector, one of the important reasons is the goal of magnesium alloys in transportation and more concentrated to save weight reduction energy. Magnesium alloy can be used as metal damping material widely used in machinery manufacturing engineering, it is necessary to further explore the mechanism of magnesium alloy damping properties and high damping performance. A long time, the domestic and foreign scholars in order to reveal the nature of the cast iron damping effect, its damping mechanism studied various theories. The damping theory can explain some of the phenomena of the damping effect of magnesium alloy, but often studied in isolation wrong as well as the interaction of point defects generated damping phenomenon, not taking into account other factors in the alloy, and the intrinsic link between them. This work attempts to evaluate the the actual damping effect of magnesium alloys in engineering applications, and further explore the nature of the damping effect of the magnesium alloy. First, have a clear grasp of the the actual damping effect for magnesium alloy using experimental modal analysis method and experimental studies on the dynamic mechanical properties of magnesium alloy and aluminum alloy engine lid, and dynamic engine with aluminum alloy material characteristics compared with that has good dynamic characteristics as well as the damping characteristics of the shock pulse loads of the engine case cover in a magnesium alloy material such as rigidity and stability. Secondly, according to the research status at home and abroad, independent research to develop a set of the damping performance measurement instrument, measuring the attenuation coefficient of the material in the vibration frequency, made good use of effects. At different times of the solid solution and solid solution of AZ91D aging heat treatment on the damping properties of the heat treated sample tested using homemade instruments - strain amplitude curve corresponding damping and heat treatment on the damping properties of the material great impact. SEM, TEM and quantitative metallography and electron probe to observe the distribution, analysis of the damping properties of the possible reasons for changes in the microstructure and composition of these heat-treated specimens. Last measured sample damping - Temperature and damping - temperature - frequency curve, the cast solution state and aged specimens are internal friction peak in the range of 155 ~ 205 ℃, this internal friction peak of activation energy were calculated, suggesting that the mechanism may be grain boundary sliding and diffusion. The solution-state sample and the aging state of the sample in the temperature range of 300 ~ 325 ℃ another internal friction peak internal friction peak generation and the second phase of growth and nucleation or thermally activated hysteresis damping related. Meanwhile, since the sample measurement repeatedly reversed, and the measured temperature is higher, may be provided in the sample microstructure creep anelasticity the aftereffect and microscopic creep damping may also this internal friction peak contributes.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Special mechanical properties of alloy
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