Materials Science Forum, Vol.396-4, 463-468, 2002
Texture evolution of an AA3xxx alloy after different homogenisation treatments
The effect of precipitation on the evolution of recrystallisation textures of a commercial Al-Mn alloy after different homogenisation treatments has been studied. The different preannealing treatments resulted in different concentrations of Mn in solid solution, with 0.5, 0.42 and 0.31 wt% Mn in solid solution, respectively, chosen to simulate typical levels through a commercial rolling schedule. During cold rolling and subsequent annealing treatments, if performed at sufficiently high temperatures, the Mn may precipitate as Al6Mn-dispersoids upon the present boundaries and retard the recrystallisation process. Concurrent precipitation resulted in relatively strong P and ND-rotated cube texture. When no precipitation occurred simultaneously to recrystallisation the texture was dominated by the cube texture, and was found to increase in strength with increasing temperature and decreasing amount of Mn in solid solution. After 95% reduction by cold rolling, a more than ten times larger grain size has been observed when precipitation occurs concurrent to recrystallisation compared to recrystallisation without precipitation.