Abstract
Keywords:
Artificial Aging, Magnesium Alloy, Dislocation Damping, Specific Damping Capacity(SDC), Interfacial Damping
Abstract
The damping behavior of commercial AZ91D magnesium alloy was investigated on the viewpoint of microstructural transformation during artificial aging. The artificial aging treatment in present study was conducted at the temperature range that the continuous and discontinuous precipitation has alternatively a role as dominant precipitation mechanism. As an index of damping property of aged specimen, the specific damping capacity(SDC) was measured through the exponential regression analyses of sine wave on logarithmic decrement. Even though the SDC of aged alloy can be increased by enhancement of interfacial characteristics, the saturated precipitation of Mg17Al12 precipitate on artificial aging has nullified to beneficial contribution of interfacial damping. The damping behavior of aged alloy depends intimately upon the spacing between precipitates as well as the increment of interfacial boundary length and area.