Abstract
The effect of the added element to aluminium, especially Mn and Sn, on the directionality of sheet is purseud by detecting the directionality by means of the Knoop indentor. The findings summed up as follows:
(1) It is possible that the directionality is controled by adding Mn, but the directionality changes very sensitively in accordance with the amout of the added elements and the annealing temperature, and on the other hand elongation decreases largely as the added Mn increases. So Mn is not suitable as the added element.
The recristallization temperature raises considerably by aadding Mn. This fact agrees with the former reports.
(2) The directionality can be controled by increasing Sn content, and in this case the directionality does not much fluctuate slightly and is stabilized notwithstanding the change in annealing temperature. The elongation decreases a little by adding Sn. So, 0.5-2.0% Sn adding is effective for the control of directionality.
It seems that the recristallization temperature raises considerably by adding Sn.
