工業用純アルミニウムにおける内部摩擦に及ぼす結晶組織の影響(<小特集>M&P2009機械材料・材料加工部門技術講演会)

概要

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Internal friction i.e. damping capacity of a solid is a structural sensitive mechanical property and is often measured for the purpose of obtaining the information on the change of microstructure of the material. In this study, the effect of microscopic texture of the commercially pure aluminum on its internal friction has been investigated. The microstructure of pure aluminum was controlled with changing the heat treatment temperature. The measurement of the internal friction was conducted under various temperatures from the room temperature to 798K using an inverted torsion pendulum apparatus. It has been clarified that the annealing process changes the peaks and the backgrounds of the internal friction. These results can be interpreted by the differences in the dislocation mobility and the average grain size of the material. The peak component of the internal friction, observed only in the specimens annealed at 773K for 3.6ks, is expected to be due to the slip at the grain boundaries in viscous manner under approximately 600K.
2010-06-25