Abstract Scope |
Plastic instability, commonly known as the Portevin–Le Chatelier (PLC) effect, manifests itself as an unstable plastic flow during tensile tests of structural materials such as steels, Al, Cu and Mg-based alloys. This phenomenon has a strong influence on diverse material properties, especially ductility, which degrades as the strain sensitivity coefficient and fracture toughness decrease, leading to unexpected vulnerabilities in the service environment. However, respective mechanisms are not yet clearly identified, especially in magnesium alloys, and this phenomenon is controlled by more complicated and various factors depending on the material. This study aims to identify the micromechanical mechanisms of PLC effect in newly developed Mg-Mn-based alloys under variation of the temperatures and strain rates. Based on the tensile tests under various conditions, the conditions in which the PLC effect clearly occurs were selected, and the correlation with microstructural factors was examined. |