Studies on double aging in Al-Zn-Mg alloys
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Double aging in (α+T) type two-phase Al-Zn-Mg alloys was investigated by hardness measurement and transmission electron microscopy. Specimens were solution-treated at 470°C, subsequently quenched into iced water and finally subjected to various heat treatments. The results obtained were as follows:Under the condition of T1<TGP<T2 (where T1 and T2 were the first-step and the second-step aging temperatures respectively, and TGP was the G. P. zone solvus temperature determined for each specimen), the maximum hardness attained in each specimen by double aging was naturally superior to that by normal aging at T2 but was inferior to that by normal againg at T1. Double aging under the conditions of T1<T2<TGP and TGP<T<1<T2 showed almost no effects on the maximum hardness. The hardness obtained under the former aging condition was undoubtedly larger than that obtained under the latter condition.Normal aging at a temperature just below TGP was considered to be the most effective aging to get the highest hardness in the present alloy system, because the hardness obtained by the above normal aging was higher than that obtained by the usual double aging.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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