Abstract
Aluminum foams have excellent high-temperature damping capabilities. However, the use of metallic hydrides to synthesize foams reduces cell ductility, due to brittle intermetallics. This study demonstrates the damping behavior of AA2024 alloy foam synthesized using Polymethyl Hydrogen Siloxane as a foaming agent. Damping capacity was studied as a function of temperature (25 to 300 °C), frequency (1 to 80 Hz) and stress amplitude (1.5 to 21.5 MPa) using Dynamic Mechanical Analyzer. For comparison, monolithic samples of AA2024 at various conditions were also tested. The damping capacity of foams was about three times higher than the monolithic samples under certain conditions. The increased damping was a consequence of dislocation activity resulting from mode conversion around the numerous microscopic pores in the aluminum foam.
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