Abstract
In our previous work, the relation between grain size, enthalpy activation volume, and Cu-content in Al solid solution alloys have been presented. Also, the effect of volume fraction of the precipitate phase on the elastic modulus was assessed. The experimental results indicate an increase in the elastic modulus values, E
exp
, with increasing Cu-content up to ∼1 at.% followed by a monotonic decrease. At approximately 10 at.%, the modulus of the alloys drops below that of the pure Al. The average grain size has been found to depend on the Cu-content and exhibited a maximum value at 3 at.% Cu and decreased when the Cu-content was raised above this value and aged at room temperature, 100 and 580 °C, respectively. The behavior of the enthalpy activation volume, V*, in dependence of the Cu-content essentially suggests an increase in the density of obstacles of dislocation intersections.