Abstract
The logarithmic decrement (δ) of elastic vibration and rigidity modulus (G) were investigated for Al-Co alloys containing 0.2 to 10.0 mass% Co. δ and G were measured using an inverted torsion pendulum. In furnace-cooled and water-quenched specimens, δ is slightly increased by adding Co, but its absolute value is about 9×10 -3 which is considerably small. The δ of furnace-cooled specimen is slightly higher than that of water-quenched one. The δ of all alloys is drastically increased by cold working after heat treatment. The value of δ in cold-worked specimens rapidly increases with the amount of Co up to about 1 mass% Co, and then the value either remains constant or decreases slightly
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