ON THE KINETICS OF DYNAMIC STRAIN-AGING

The stress-strain phenomena for the regime B of the Portevin-Le Chatel ier effect (i.e. hopping bands of fast deformation) are analyzed. The depth of dynamic strain ageing (DSA), defined as the maximum stress in crease of negative rate dependence due to DSA, is presented for the te nsile deformation courses made at various applied rates. The connectio n 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 deform ation part of the flow stress are appreciably raised by dynamic strain ageing.