FRACTIONAL RECRYSTALLIZATION KINETICS IN DIRECTLY COLD ROLLED Al-Mg, Al-Mg-Sc AND Al-Mg-Sc-Zr ALLOY

The evaluation of texture as a function of recrystallization has been characterized for directly cold rolled Al-۶Mg, Al-۶Mg-۰.۴Sc and Al-۶Mg-۰.۴Sc-۰.۲Zr alloys. Samples were annealed isothermally at ۴۰۰ °C for ۱ to ۲۴۰ minutes to allow recrystallization. Recrystallization kinetics of the alloys is analyzed from the micro-hardness variation. Isothermally annealed samples of aluminum alloys were also studied using JMAK type analysis to see if there exists any correlation between the methods. Recrystallization fraction behavior between two methods the scandium added alloys show the higher variation due to precipitation hardening and higher recrystallization behavior. The scandium and zirconium as a combined shows the more variation due to formation of Al۳(Sc, Zr) precipitate. From the microstructure it is also observed that the base Al-Mg alloy attained almost fully re-crystallized state after annealing at ۴۰۰ °C for ۶۰ minutes

Keywords:

Al-Mg alloys , annealing , fraction recrystallization , precipitate