Al-Zn-Mg合金の二段時効

鈴木 寿; 菅野 幹宏; 浅見 重則

doi:10.2464/jilm.22.10_605

Studies on double aging in Al-Zn-Mg alloys

Hisahi SUZUKI, Motohiro KANNO, Shigenori ASAMI

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JOURNAL FREE ACCESS

1972 Volume 22 Issue 10 Pages 605-612

DOI https://doi.org/10.2464/jilm.22.10_605

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Published: October 30, 1972 Received: June 13, 1972 Available on J-STAGE: July 23, 2008 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 23, 2008 Reason for correction: - Correction: ABSTRACT Details: Wrong : Double aging in (α+T) type two-phase Al-Zn-Mg alloys was investigated by hardness measuremcnt and transmission electron microscopy. Specimens were solution-treated at 470°C, subsequently quenched into iced water and finally jected to various heat treatments. The results obtained were as follows:
Under the condition of T₁<T_GP<T₂ (where T₁ and T₂ were the first-step and the second-step aging temperaturcs respectively, and T_GP 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<T_GP and T_GP<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 T_GP 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.
Right : 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<T_GP<T₂ (where T₁ and T₂ were the first-step and the second-step aging temperatures respectively, and T_GP 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<T_GP and T_GP<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 T_GP 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.

Date of correction: July 23, 2008 Reason for correction: - Correction: CITATION Details: Wrong : 7) I. J. Polmear: J. Inst. Metals, 87 (1958-59),24.
8) G. W. Lorimer and R. B. Nicholson: Acta Met., 14 (1966), 1009.
9) G. W. Lorimer and R. B.Nicholson: The Me-chanisms of Phase Transformations in Crystal-line Solids, Institute of Metals, (1969), 36.
10) D. W. Pashley, M. H. Jacobs and J. T. Vietz: Phil. Mag., 16 (1967), 51.
11) G. Thomas and J. Nutting:J. Inst. Metals, 88 (1959-60), 81.
12) G. W. Greenwood: Acta Met., 4 (1956), 243.
13) H. Schmalzried and V. Gerold: Z. Metallk., 49 (1958), 291.
14) V. Gerold and H. Harberkorn: Z. Metallk., 50 (1959), 568.
16) O. Kawano, Y. Murakami, et al: Trans. JIM, 11 (1970), 12.

Right : 7) I. J. Polmear: J. Inst. Metals, 87 (1958-59),24.
8) G. W. Lorimer and R. B. Nicholson: Acta Met., 14 (1966), 1009.
9) G. W. Lorimer and R. B.Nicholson: The Mechanisms of Phase Transformations in Crystalline Solids, Institute of Metals, (1969), 36.
10) D. W. Pashley, M. H. Jacobs and J. T. Vietz: Phil. Mag., 16 (1967), 51.
11) G. Thomas and J. Nutting:J. Inst. Metals, 88 (1959-60), 81.
12) G. W. Greenwood: Acta Met., 4 (1956), 243.
13) H. Schmalzried and V. Gerold: Z. Metallk., 49 (1958), 291.
14) V. Gerold and H. Harberkorn: Z. Metallk., 50 (1959), 568.
16) O. Kawano, Y. Murakami, et al: Trans. JIM, 11 (1970), 12.

Date of correction: July 23, 2008 Reason for correction: - Correction: PDF FILE Details: -

Abstract

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<T_GP<T₂ (where T₁ and T₂ were the first-step and the second-step aging temperatures respectively, and T_GP 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<T_GP and T_GP<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 T_GP 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.

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