Abstract
The variation with temperature of the internal friction of aluminum alloys was studied by torsion pendulum method. In temperature ranges, 40°C to 150°C and 200°C to 280°C, the decrement of solution treated alloys exhibited a first peak and a second peak. The height of the two peaks varied with aging conditions, components of the alloying element and grain sizes of the specimen. An explanation of such a behavior on age-hardening processes was developed. In the first peak, the initial increase of the decrement with temperature was attributed to the thermally activated motion of dislocation lines, and the subsequent decrease to the supression of the dislocation motion by a formation of Guinier-Preston zone. The second peak was attributed to variation of the grain-boundary relaxation due to a precipitation of θ′ (or S′) compound at the boundaries.
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