ABSTRACT
This chapter considers experimental data on recrystallization in aluminum alloys containing scandium. It focuses on the effect of scandium concentration on the temperature range of recrystallization; recrystallization in supersaturated solid solutions; and the recrystallization of alloys containing secondary ScAl3 precipitates prior to plastic deformation and annealing. The chapter correlates the fineness parameters of secondary precipitates and the forces hampering recrystallization. The annealed, hot-extruded and aged alloys demonstrate almost the same lattice parameter as that of the completely decomposed solid solution. The study of aging processes in quenched alloys shows that the decomposition of a supersaturated solid solution starts at 250°C irrespective of scandium concentration and coagulation and softening occur on annealing at temperatures above 450°C. Superplastic forming is one of the advanced technologies for producing complex components which cannot be manufactured by traditional methods. An important technological parameter of primary recrystallization is the temperature at which the recrystallized grains appear.
