Dynamic strain aging (DSA) in solid solutions is described as diffusion of solute atoms to mobile dislocations, temporarily arrested at obstacles. As a consequence the solute concentration experienced locally by the dislocations depends on the time of arrest and the solute diffusion coefficient. Starting from this idea the dependence of the flow stress on strain rate, temperature, and strain in the presence of DSA is calculated. A criterion for the onset of serrated yielding is formulated. Finally the change in strain rate sensitivity due to DSA is calculated. The theory allows a qualitative and in some respects a quantitative comparison with experimental results of which some examples are given.

Theory of the effect of dynamic strain aging on mechanical properties

Theory of flow localisation due to dynamic strain ageing

Mathematics of the portevin-le chatelier effect

The kinetics of the Portevin-Le Chatelier bands in an Al-5at%Mg alloy

The Portevin-Le Chatelier (PLC) effect is a manifestation of macroscopic scale non-uniformities which have their origins on a microstructural level. The coordination of dislocation level events wit...

J.Schade van Westrum

Papers

Serrated yielding and inhomogeneous deformation in Au(14at%Cu)

On the difference between Lüders bands and portevin — Le chatelier bands

Strain rate experiments and the portevin le chatelier effect in Au (14 at% Cu)