THE RELATIVE CONTRIBUTION OF DIFFERENT NUCLEATION SOURCES TO RECRYSTALLIZATION TEXTURES OF A COLD-ROLLED ALUMINUM-MAGNESIUM ALLOY

Development of recrystallization texture was studied as a function of annealing temperature in a cold-rolled alloy AA5182. A noticeable decr ease in rolling texture orientations was observed with increasing anne aling temperatures. Particle deformed zones and deformed bands served as the respective sources for PSN (particle stimulated nucleation) and non-PSN nucleation. Although no significant difference between approx imate growth rates of different orientations were observed, our studie s indicated that PSN grains nucleated first. Thus, increased annealing temperatures favored PSN nucleation, but did not change the number of PSN grains in the rolling texture orientations. In other words, the r elative randomization of texture at higher annealing temperatures was mainly caused by reduced non-PSN nucleation and not by changes in the orientations of PSN grains. The global recrystallization textures were simulated from the weighted sum of the PSN and non-PSN nuclei.