Application of Doppler Broadening of Annihilation Radiation Technique to Evaluate the Microhardness Variations during Isochronal Annealing of Al and Al (Mn) Alloys

Abstract

Doppler broadening measurements have been carried out to study the isochronal annealing of cold-worked commercial pure Al (99.5%) and Al-1 wt.% Mn alloys. The deduced line shape and wing parameters are investigated in the range from room temperature to 823 K and correlated with the corresponding microhardness measurements. The vacancy migration and the effect of the precipitated Al6 Mn in Al (Mn) alloys could be probed as a function of annealing temperature. Three stages of microstructures can be distinguished in both Al and Al (Mn) alloys, which are recovery, partial recrystallization, and complete recrystallization. The line shape parameter-wing parameter (S-W) map indicates the same behavior in both alloys at high temperature. However, at low temperatures, Al (Mn) shows different behavior from the linear trajectory Al alloy.