1. The decrement of vibrations of wrought aluminum is lower than that of magnesium, and amounts to 0.01 at an amplitude of 2.9·10−4. 2. Alloying reduces the damping capacity of aluminum. A sharp reduction of the decrement with alloying and a low level of the decrement (0.001) are characteristic of systems with relatively high solubility of the components and a substantial increase of hardness due to alloying. 3. For systems with low solubility of the components the decrement decreases negligibly with alloying and has a higher value (0.002–0.005).