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Ultrafine-grained pure aluminum L2 with a mean grain size of 1.0μm was produced by equal channel angular pressing (ECAP) and annealing at 150°C for 2h. Damping behavior of the alloy was measured using a dynamic mechanical thermal analyzer. The alloy had an excellent damping capacity Q −1 with the ambient value being 9.8×10 −3 at 1.0Hz when the strain amplitude was 2.0×10 −5 ...
ZA27 alloy was prepared by casting with permanent mold and then annealed at 250°C for 1—4h. The damping capacity of the alloy was measured using a testing apparatus based on the cantilever beam technique. It was found that the as-cast ZA27 alloy possesses high damping capacity with the value of 1.3 × 10 −3 at 320Hz. After annealed at 250°C for 1h, the damping capacity decreases to 1.1 × 10...
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