PORTEVIN-LE CHATELIER EFFECT IN ALMG3 STUDIED USING ELEVATED TEMPERATURE NANOINDENTATION

摘要

The Portevin-Le Chatelier (PLC) is a plastic instability observed in different alloys, and particularly in aluminum alloys, which is characterized by a serrated flow during plastic deformation. The PLC effect originates from the competition between gliding of mobile dislocations and pinning of these dislocations by diffusing solute atoms. This dynamic strain hardening leads to a negative strain rate sensitivity which is often used to characterize or quantify the PLC effect.