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Abstract
This study determines the feasibility of describing the flow stress within the five-power-law creep regime, using a linear superposition of a dislocation hardening term and a significant solute strengthening term. It is assumed that the solutes are randomly distributed. It was found that by using an energy balance approach, the flow stress at high temperatures can be well-described by the classic Taylor equation with a solute strengthening term, τo, that is added to the αMGbρ1/2 dislocation hardening term.
Highlights
This paper addresses the theoretical validity of the application of a Taylor equation to five-power-law creep in pure alloys and class M alloys
References [1,2] show for the case of annealed 99.999% pure aluminum, that the yield stress appears to be a significant fraction of the, eventual, steady-state flow stress
This study determined the theoretical feasibility of describing dislocation hardening within the five-power-law creep regime using a classic Taylor equation using a linear superposition of a dislocation hardening term and a solute strengthening term
Summary
This paper addresses the theoretical validity of the application of a Taylor equation to five-power-law creep in pure alloys and class M alloys. Previous work on aluminum and stainless steel by the author [1,2,3] shows that the density of dislocations within the subgrain interior influences the flow stress for steady-state substructures as well as primary creep. References [1,2] show for the case of annealed (very low dislocation density) 99.999% pure aluminum, that the yield stress appears to be a significant fraction of the, eventual, steady-state flow stress. Yield strength could be a lattice friction stress (similar to a Peierls stress) should be acknowledged
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