The recrystallization characteristics of moderately deformed aluminum

TLDR: In this paper, the early stage of isothermal recrystallization of moderately deformed, polycrystalline alloys of zone-refined aluminum containing 20 and 45 at. ppm of Au has been studied by quantitative metallography.

Abstract: The early stage of isothermal recrystallization of moderately deformed, polycrystalline alloys of zone-refined aluminum containing 20 and 45 at. ppm of Au has been studied by quantitative metallography. The basic structural parametersXv, the volume fraction recrystallized, andSv, the grain boundary area per unit volume, were measured on specimens annealed for different times at specific temperatures in the range 80° to 187°C. Both the maximum, Gm, and the average,\(\bar G\), growth rates of the recrystallizing grains were also determined. All results could be interpreted in terms of a site-saturated, matrix grain edge nucleation at zero time with subsequent two-dimensional growth perpendicular to the nucleated edge controlling recrystallization kinetics. An equation relatingSv toXv was derived and found to describe the experimental data quite well. Experimentally, the ratio\(G_m /\bar G\) was 2.6 and the activation energy for growth was 25,700 cal per mole.