Cold-Rolling Effect on Low-Frequency Damping Properties of AZ31 Magnesium Alloy Plate at Moderately High Temperature

This study investigated the influence of cold-rolling on the damping capacity of the hot-extruded AZ31 alloy plate. The damping capacity of the hot-extruded and the cold-rolled AZ31 alloy plates were measured by a dynamic mechanical analysis with a single cantilever from 0°C to 250°C at a constant heating rate. Experimental results demonstrated increased damping capacity, which is evident in both the P2 peak and the high-temperature damping background (HTDB). The activation energy of the HTDB decreased from 2.01 eV to 0.91 eV after cold-rolling. This reduction suggests that the cold-rolling process accelerates grain boundary diffusion, promoting creep deformation at elevated temperatures. While cold-rolling enhances the HTDB damping capacity of the AZ31 alloy plate, it concurrently compromises its creep resistance at moderately high temperatures (100°C to 250°C). Therefore, for engineering applications of AZ31 alloy plates within this temperature range, careful consideration of this trade-off between improved damping and diminished creep resistance is crucial.