Al-1.6%Mg₂Si合金の165℃時効におよぼす予備時効の効果

抄録

Influence of pre-aging at from 20°V to 90°V on age hardening of an Al-1.6%Mg₂Si alloy at 165°C was studied after solution treatment at 580°C. When the maximum hardness, attained at the 165°V aging, was plotted against the pre-aging time at 20-90°V, the concave curves were obtained. This indicates that the largest retardation effect is exhibited by the pre-aging at a certain pre-aging period. From the comparison of the experimental results obtained in the previous report, where the dissolving rate of aged Al-1.6%Mg₂Si alloys had been studied, it was found that the pre-aging time to produce the largest retardation effect was in agreement with that to produce the minimum dissolving rate.