Abstract

Dynamic strain ageing (DSA) phenomena, which stem from the dynamic interaction of mobile dislocations and diffusing solute atoms, are observed in many dilute alloys at intermediate temperatures. In uniaxial deformation, DSA may lead to a negative strain rate sensitivity (SRS) of the flow stress and to the occurrence of jerky flow, alias the Portevin-Le Châtelier (PLC) effect [1]. The load serrations associated with the PLC effect are related to the propagation of deformation bands and the formation of visible surface markings at the surface of the deformed samples [2].

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