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Abstract
The grain boundary internal friction peak (GBP) of AlMg polycrystals has been measured in an inverted torsion pendulum. The height of the GBP is greatly suppressed GBP recovers after annealing at an Al-2.4wt.%Mg and Al-6.0wt.%Mg specimens. This suppressed GBP recovers after annealing at an elevated temperature. Phase analysis by X-ray diffraction techniques indicates that this process is accompanied by formation and dissolution of AlMg metastable phase particles which are introduced by non-equilibrium segregation of magnesium atoms at grain boundaries after quenching. A suitable interpretation based on numerical estimation is given.
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