Experimental Examination of the Additivity of High-Temperature Solution Hardening due to Different Solute Elements

Abstract

In order to clarify the additive effect of different solute elements on the solute-atmosphere drag stress of dislocations, solution-strengthened Al-Mg, Al-Cu and Al-Mg-Cu alloys were creep-tested at 723 K under stresses ranging from 3 to 12 MPa, and the effective stress, internal stress and dislocation-mobility were measured during deformation by the stress-change technique.
It is found that a relation,
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\ oindentholds in common for these alloys. Here, C_Mg^eq is the equivalent Mg concentration, C_Mg and C_Cu the concentrations of Mg and Cu, respectively. From this relation, it is concluded that the effective stress for the solute-atmosphere drag in the tertiary alloys is simply given by the sum of solution hardenings due to Mg and Cu atoms.