On the Recrystallization of Aluminium Alloys Containing Molybdenum and Tungsten

Abstract

The effect of addition of Mo or W micro powder on the recrystallization behaviour of cold-rolled Al and Al-2%Mg alloy has been studied by means of hardness measurement and microscopy. The results obtained were as follows: (1) The recrystallization temperature in Al and Al-Mg alloy rose slightly with the increase of the amount of added Mo or W till the content reached a certain critical amount, as shown in Table 2. When the content is larger than this critical value, however, the recrystallization temperature became almost constant. (2) The size of the recrystallized grains become progressively finer with addition of Mo or W till the content of Mo or W reaches 0.3∼0.5%Mo or W in Al, and 0.05∼0.1%Mo or 0.2∼0.3%W in Al-Mg alloy. In the specimens with Mo or W of more than this content,however, the recrystallized grains are fairly fine and almost constant against the change of final annealing temperature as well as cold-rolling reduction of more than medium degree, also free of influence from the variation of the preliminary annealing temperature. (3) The recrystallization diagrams of Al and Al-Mg alloy containing Mo or W have been studied, as shown in Fig. 3,Fig. 4,Fig. 5 and Fig. 6.