Abstract
The relation between the effect of the titanium content and the effect of the preliminary annealing temperature before cold-work on the recrystallization behaviour of cold rolled aluminium-titanium alloy,aluminium-copper-titanium alloy and aluminium-magnesium-titanium alloy has been studied by means of hardness test and microscopic method. The results obtained are as follows: (1) For each kind of these alloys containing Ti up to about 0.1∼0.2%, the elevation of the preliminary annealing temperature from 350° to 550° results in the increase of the initial or final recrystallization temperature to the extent of about 15° or 30° and makes the recrystallized grain size remarkablly larger. (2) While for each alloy containing more than 0.2% of Ti, the variation of the preliminary annealing temperature has little effect on the recrystallization temperature and on the recrystallized grain size which was fairly fine and almost constant against the change of annealing temperature as well as cold reduction of more than medium degree. (3) Recrystallization diagrams for these alloys have been proposed with respect to the content of Ti and the variation of the preliminary annealing temperature.
