Al-Zn-Mg合金の時効現象におよぼすCu添加の影響

鈴木 寿; 菅野 幹宏; 浅見 重則

doi:10.2464/jilm.22.11_661

鈴木寿, 菅野幹宏, 浅見重則

著者情報

ジャーナルフリー

1972 年 22 巻 11 号 p. 661-667

DOI https://doi.org/10.2464/jilm.22.11_661

詳細

発行日: 1972/11/30 受付日: 1972/06/26 J-STAGE公開日: 2008/07/23 受理日: - 早期公開日: - 改訂日: -
訂正情報
訂正日: 2008/07/23 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : The role of Cu in aging phenomena in Al-Zn-Mg-Cu alloys was investigated by hardness and specific heat measurements and transmission electron microscopy. Various specimens, based on (α+T) type Al-Zn-Mg alloys, with a nearly fixed amount of 5.5at% in (Zn+Mg) and with different Cu contents were used. The specimens were solution-treated at 470°C for 2hrs, quenched into iced-water, and finally subjected to aging at various tempera tures. The results obtained were as follows:
(1) As Cu content increased, the initial rate of age hardening and the maximum hardness attained at 125-150°C aging increased. The time required for hardness to reach the maximum also increased. This indicates that the quarternary alloys are superior to the ternary alloys with respect to hardness and heat resistant characterlstlcs.
(2) Specific heat measurement and observation on transmission electron microscopy showed that two sorts of precipitation processes would exist in Al-Zn-Mg-Cu alloys when Cu contents exceeded about 0.7wt%. One process was that observed in Al-Zn-Mg alloys and the other was that observed in Al-Cu-Mg alloys.
(3) Clusters or precipitates, which were formed in the present quarternary alloys and corresponded to those in Al-Cu-Mg alloys, were considered to be responsible for the peculiar aging phenomena in the quarternary alloys.
Right : The role of Cu in aging phenomena in Al-Zn-Mg-Cu alloys was investigated by hardness and specific heat measurements and transmission electron microscopy. Various specimens, based on (α+T) type Al-Zn-Mg alloys, with a nearly fixed amount of 5.5at% in (Zn+Mg) and with different Cu contents were used. The specimens were solution-treated at 470°C for 2hrs, quenched into iced-water, and finally subjected to aging at various tempera tures. The results obtained were as follows:
(1) As Cu content increased, the initial rate of age hardening and the maximum hardness attained at 125-150°C aging increased. The time required for hardness to reach the maximum also increased. This indicates that the quarternary alloys are superior to the ternary alloys with respect to hardness and heat resistant characteristics.
(2) Specific heat measurement and observation on transmission electron microscopy showed that two sorts of precipitation processes would exist in Al-Zn-Mg-Cu alloys when Cu contents exceeded about 0.7wt%. One process was that observed in Al-Zn-Mg alloys and the other was that observed in Al-Cu-Mg alloys.
(3) Clusters or precipitates, which were formed in the present quarternary alloys and corresponded to those in Al-Cu-Mg alloys, were considered to be responsible for the peculiar aging phenomena in the quarternary alloys.

訂正日: 2008/07/23 訂正理由: - 訂正箇所: 引用文献情報訂正内容: Wrong : 6) D. J. Strawbridge, W. Hume-Rothery and A. T. Little: J. Inst. Metals: 74 (1948), 191.
7) I. J. Polmear: J. Inst. Metals: 89 (1960-61), 51
10) W. F. Smith and N. J. Grant: Met. Trans. 2 (1971), 1333.
11) N. S. Brommelle and H. W. L. Phillips: J. Inst. Metals, 75 (1948-49), 529.
12) G. Thomas: J. Inst. Metals, 90 (1961-62), 57.
13) H. K. Hardy: J. Inst. Metals, 83 (1954~55), 17.
16) J. M. silcock: J.Inst. Metals, 89 (1960-61),203.

Right : 6) D. J. Strawbridge, W. Hume-Rothery and A. T. Little: J. Inst. Metals: 74 (1948), 191.
7) I. J. Polmear: J. Inst. Metals: 89 (1960-61), 51
10) W. F. Smith and N. J. Grant: Met. Trans. 2 (1971), 1333.
11) N. S. Brommelle and H. W. L. Phillips: J. Inst. Metals, 75 (1948-49), 529.
12) G. Thomas: J. Inst. Metals, 90 (1961-62), 57.
13) H. K. Hardy: J. Inst. Metals, 83 (1954~55), 17.
16) J. M. Silcock: J.Inst. Metals, 89 (1960-61),203.

訂正日: 2008/07/23 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

抄録

The role of Cu in aging phenomena in Al-Zn-Mg-Cu alloys was investigated by hardness and specific heat measurements and transmission electron microscopy. Various specimens, based on (α+T) type Al-Zn-Mg alloys, with a nearly fixed amount of 5.5at% in (Zn+Mg) and with different Cu contents were used. The specimens were solution-treated at 470°C for 2hrs, quenched into iced-water, and finally subjected to aging at various tempera tures. The results obtained were as follows:
(1) As Cu content increased, the initial rate of age hardening and the maximum hardness attained at 125-150°C aging increased. The time required for hardness to reach the maximum also increased. This indicates that the quarternary alloys are superior to the ternary alloys with respect to hardness and heat resistant characteristics.
(2) Specific heat measurement and observation on transmission electron microscopy showed that two sorts of precipitation processes would exist in Al-Zn-Mg-Cu alloys when Cu contents exceeded about 0.7wt%. One process was that observed in Al-Zn-Mg alloys and the other was that observed in Al-Cu-Mg alloys.
(3) Clusters or precipitates, which were formed in the present quarternary alloys and corresponded to those in Al-Cu-Mg alloys, were considered to be responsible for the peculiar aging phenomena in the quarternary alloys.

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