Effect of Cold-Rolling on Damping Characteristics of Multi-Component Al–12%Si Alloy Measured by Dynamic Mechanical Analyzer

Abstract

Compared to pure Al, a multi-component Al–12%Si alloy deteriorates the low-frequency damping capacity in the temperature regions of an athermal damping background and a high-temperature damping background (HTDB) because the dislocation motions during damping are impeded by the abundant silicon particles in Al–12%Si alloy. However, Al–12%Si alloy improves the creep resistance in the HTDB temperature region because of an increase in the activation energy of the HTDB. Severely cold-rolled Al–12%Si alloy significantly increases the damping capacity and hardness, and a conspicuous internal friction peak appears at approximately 270°C which corresponds to the occurrence of grain recrystallization. The effect of cold-rolling becomes insignificant after recrystallization occurs.