Abstract
It is said that the cold-rolled Al-Mg alloy sheets decrease their tensile strength during ageing. In this paper, the result of study on various effects of ageing on Al-2-8%Mg alloy sheets is reported.The decrease of hardness and tensile strength of Al-2-8%Mg alloy sheets was recognized from the preliminary experiment.In order to prevent the decrease of hardness and tensile strength, the authors studied two methods of (1) heat treatment, and (2) addition of the third element.The results obtained were as follows.(1) The annealing of 100°C ×1hr. stabilized tensile strength of these alloy sheets, and reduced the rate of increase of elongation.(2) The addition of 1.0%Cr and 1.0%Mn seemed to repress somewhat the decrease of tensile strength and the increase of elongation.
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