MICROSTRUCTURE AND LOCAL CRYSTALLOGRAPHIC EVOLUTION IN AN Al-1 wt/100 Mg ALLOY DEFORMED AT INTERMEDIATE TEMPERATURE AND HIGH STRAIN-RATE

摘要

The deformation processes occurring in an Al-1 wt/100 Mg alloy of commercial purity have been studied using plane strain compression (PSC). As part of a matrix of tests covering a range of temperatures and strain rates experienced in industrial hot rolling, the combination T = 305℃ and ε = 25 s~(-1) has been studied in detail. This is near the top of the possible range for the Zener-Hollomon parameter, Z, in hot rolling. Experimental measurements of cell size, misorientation between cells and dislocation density were obtained as a function of strain. The qualitative interpretation of the microstructure was enhanced by the judicious use of both optical and transmission electron microscopy.