Abstract
The stress-strain phenomena for the regime B of the Portevin-Le Chatelier effect (i.e. hopping bands of fast deformation) are analyzed. The depth of dynamic strain ageing (DSA), defined as the maximum stress increase of negative rate dependence due to DSA, is presented for the tensile deformation courses made at various applied rates. The connection of the depth of DSA to the solute- and strain-hardening mechanisms is derived. It is concluded that both the friction as well as the deformation part of the flow stress are appreciably raised by dynamic strain ageing.

Key words
stress-strain phenomena, Portevin-Le Chatelier effect, dynamic strain ageing (DSA)

Full text (2501 KB)