As the critical materials for fabrication of hot-parts of turbine engine, Superalloys are widely used in areas of energy, traffic, petroleum, chemical industry and so on. Under certain conditions, the PLC effect occurs in the superalloys. Therefore, it has an importantly theoretical and practical significance to carry out multi-scale researches on the PLC effect in the superalloys.
The PLC effects of complex superalloys with different stacking fault energy are systematically investigated from the comprehensive analysis of macro and micro experimental results. The critical factors and underlying mechanisms dominating dynamic strain aging are analyzed profoundly from the type and concentration of solute atoms, precipitation and evolution of precipitated phase, mobile dislocation density and forest dislocation density evolution. For the macro-observation of the PLC band, three-dimensional digital image correlation (DIC) method is adopted to study the propagation and temporal and spatial evolution of the PLC band.