Abstract
These studies were carried out for the specimens of pure aluminum wire (purity 99.99%) to discuss the variations in tensile strength, clongation. hardness, crystal structure, etc. according to the temperatures of cold drawing and annealing.
The results obtained were as follows:
(1) The tensile strength increased linearly with the increase of the degree of reduction and it attained to a maximum value of 12-13kg/mm2.
(2) The distribution of the hardness of cold drawn specimens was nearly uniform in the case of lower reduction degree; on the other hand, when the reduction degree was above 60%, the hardness was low on the surface, but high in the centre of the specimens.
(3) The annealing temperature giving the maximum elongation was 250-300°C. for the specimens of the reduction degree of above 80%. The grain size of the specimens at that temperature was very uniform within the range of 0.08-0.1mm.
