Abstract
The effect of titanium on the recrystallization behaviour of cold rolled aluminium as well as aluminium-magnesium alloy has been studied, by mean chiefly of microscopic and X-ray method. An addition of titanium elevates recrystallization-temperatures of aluminium and aluminium-magnesium alloy to the extent of about 50° and makes their grain-size after annealing finer, especially when they are annealed at high temperatures. These effects of titanium, however, are remarkable till the content of titanium reaches 0.1∼0.2%, showing probably the limit of solid solubility of titanium in aluminium. The recrystallized grain-size of Al-1.7% Mg alloy containing more than 0.1% of titanium is fairly fine and almost constant against the change of annealing temperature as well as cold-reduction over 20%. Recrystallization diagrams for Al-Ti and Al-Mg-Ti alloys have been proposed based on the determination of the grain-size after annealing as a function of rolling reduction and temperature of annealing.
