Work-hardening and recovery studies of pure aluminium
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Date
1985
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Obafemi Awolowo University, Ile Ife, Nigeria
Abstract
The effects of work-hardening and recovery on the strength of pure aluminium have been
investigated. The modes of interaction of these two processes during creep deformation were
closely examined. The Bailey-Orowan equation was derived without recourse to a mechanical
equation of state. This new method of derivation clearly showed that the Bailey-Orowan
equation is applicable only to steady-state but not to transient creep deformation.
The results of recovery tests performed on prestrained samples showed that the flow stress
decreased with recovery time, eventually approaching an asymptotic value which was
appreciably higher than the flow stress of the annealed sample. It was demonstrated that the
recovery rate was not a unique function of the instantaneous dislocation density.
Stress increment and stress removal (state recovery) tests performed on the creeping samples
showed the generation of appreciable instantaneous plastic strains during the stress hike, and
high strain rates following recovery. Both of these observations are consistent with the promise
that creep is recovery-controlled in this material.
Description
89p
Keywords
Aluminium, Bailey-Orowan equation, Transient creep deformation, Asymptotic value, Recovery rate