Al-Zn合金の初期時効速度におよぼす微量Mg添加の影響

鈴木 寿; 菅野 幹宏; 福永 和義

doi:10.2464/jilm.22.286

Effects of small addition of magnesium on initial aging rate of Al-Zn alloys

Hisashi SUZUKI, Motohiro KANNO, Kazuyoshi FUKUNAGA

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JOURNAL FREE ACCESS

1972 Volume 22 Issue 4 Pages 286-294

DOI https://doi.org/10.2464/jilm.22.286

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Published: April 30, 1972 Received: December 07, 1971 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 : The effects of addition of a small amount of Mg atoms on initial aging rate of Al-(3 or 5 at%) Zn alloys were investigated in order to clarify the mechanism that G. P. zone formation is remarkably suppressed by this addition. The specimens were composed of two sorts of alloy systems; Al-3 at%Zn-Mg and Al-5 at%Zn-Mg, in which Mg contents were systematically changed.
In these studies, special attention was paid to the compositions of specimens whether they were two-phase or three-phase alloys at each aging temperature. Since the aging behavior would be different between two-phase and three-phase alloys, the two-phase alloys should be required for the quantitative studies of the above mechanism.
The results obtained were as follows:
(1)The compositions of Mg limit(between two-phase and three-phase alloys)in each alloy system were determined as a function of temperature by means of X-ray analysis and resistivity and calorimetric measurements. The results revealed that all specimens, which showed suppression phenomena in previous investigations, were surely three-phase alloys at each aging temperature.
(2) It was confirmed that the aging curvcs of the two-phase specimens did not show any suppression in the initial aging rate in quite the same way as in Al-Zn binary alloys. Whereas, in three-phase specimens, the suppression was more marked with the increase of Mg content.
(3) The suppression phenomena observed in three-phase alloys could be explained by the slow rate of formation of the 2nd G. P. zone, which would have appeared during the aging probably corresponding to θ (Mg₂Zn₁₁) stable phase.
(4) As the results, the previous theories which explained the retardation of the initial aging rate in Al-Zn-Mg alloy system on the assumption ofinteraction between vacancy and Mg atom were proved to be erroneous.
Right : The effects of addition of a small amount of Mg atoms on initial aging rate of Al-(3 or 5 at%) Zn alloys were investigated in order to clarify the mechanism that G. P. zone formation is remarkably suppressed by this addition. The specimens were composed of two sorts of alloy systems; Al-3 at%Zn-Mg and Al-5 at%Zn-Mg, in which Mg contents were systematically changed.
In these studies, special attention was paid to the compositions of specimens whether they were two-phase or three-phase alloys at each aging temperature. Since the aging behavior would be different between two-phase and three-phase alloys, the two-phase alloys should be required for the quantitative studies of the above mechanism.
The results obtained were as follows:
(1)The compositions of Mg limit(between two-phase and three-phase alloys)in each alloy system were determined as a function of temperature by means of X-ray analysis and resistivity and calorimetric measurements. The results revealed that all specimens, which showed suppression phenomena in previous investigations, were surely three-phase alloys at each aging temperature.
(2) It was confirmed that the aging curves of the two-phase specimens did not show any suppression in the initial aging rate in quite the same way as in Al-Zn binary alloys. Whereas, in three-phase specimens, the suppression was more marked with the increase of Mg content.
(3) The suppression phenomena observed in three-phase alloys could be explained by the slow rate of formation of the 2nd G. P. zone, which would have appeared during the aging probably corresponding to θ (Mg₂Zn₁₁) stable phase.
(4) As the results, the previous theories which explained the retardation of the initial aging rate in Al-Zn-Mg alloy system on the assumption of interaction between vacancy and Mg atom were proved to be erroneous.

Date of correction: July 23, 2008 Reason for correction: - Correction: CITATION Details: Wrong : 1) H. K. Hardy: J. Inst. Metals, 80 (1951-52) 483.
2) J. M. Silcock: Phil. Mag., 4 (1959) 1187.
3) I.J. Polmear: J. Inst. Metals, 89 (1960-61) 51.
3) I.J. Polmear: J. Inst. Metals, 89 (1960-61) 51.
4) I. J. Polmear: J. Inst. Metals, 89 (1960-61) 193.
5) H. Kimura and R. R. Hasiguti: Acta Met., 19 (1961) 1076.
8) M. Murakami, O. Kawano and Y. Murakami: Trans. Met. Soc. AIME 245 (1969) 815.
9) N. K. Srinivasan and V. Ramachandran: Scripta Met., 4 (1970) 617-622
10) A. J. Perry: Acta Met., 14 (1966) 1143.
11) Panseri and T. Federighi: Acta Met., 11 (1963) 575.
12) G. Bartsch: Acta Met., 12 (1964) 270.
13) C. Panseri and T. Federighi: Acta Met., 12 (1964) 273.
14) R. W. Gould and V. Gerold: Acta Met., 12 (1964) 954.
15) M. Ohta and F. Hashimoto: Trans. JIM, 16 (1965) 9.
16) M. Murakami, O. Kawano and Y. Murakami: Acta Met., 17 (1969) 29.
17) W. L. Fink and L.A. Willey: Trans. Met. Soc. AIME, 124 (1937) 78.
18) V. Ramachandran and N. K. Srinivasan: Scripta Met., 1 (1967) 103.
21) J. M. silcock: J. Inst. Metals, 89 (1960-61) 203.

Right : 1) H. K. Hardy: J. Inst. Metals, 80 (1951-52) 483.
2) J. M. Silcock: Phil. Mag., 4 (1959) 1187.
3) I.J. Polmear: J. Inst. Metals, 89 (1960-61) 51.
4) I. J. Polmear: J. Inst. Metals, 89 (1960-61) 193.
5) H. Kimura and R. R. Hasiguti: Acta Met., 19 (1961) 1076.
8) M. Murakami, O. Kawano and Y. Murakami: Trans. Met. Soc. AIME 245 (1969) 815.
9) N. K. Srinivasan and V. Ramachandran: Scripta Met., 4 (1970) 617-622
10) A. J. Perry: Acta Met., 14 (1966) 1143.
11) Panseri and T. Federighi: Acta Met., 11 (1963) 575.
12) G. Bartsch: Acta Met., 12 (1964) 270.
13) C. Panseri and T. Federighi: Acta Met., 12 (1964) 273.
14) R. W. Gould and V. Gerold: Acta Met., 12 (1964) 954.
15) M. Ohta and F. Hashimoto: Trans. JIM, 16 (1965) 9.
16) M. Murakami, O. Kawano and Y. Murakami: Acta Met., 17 (1969) 29.
17) W. L. Fink and L.A. Willey: Trans. Met. Soc. AIME, 124 (1937) 78.
18) V. Ramachandran and N. K. Srinivasan: Scripta Met., 1 (1967) 103.
21) J. M. silcock: J. Inst. Metals, 89 (1960-61) 203.

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

Abstract

The effects of addition of a small amount of Mg atoms on initial aging rate of Al-(3 or 5 at%) Zn alloys were investigated in order to clarify the mechanism that G. P. zone formation is remarkably suppressed by this addition. The specimens were composed of two sorts of alloy systems; Al-3 at%Zn-Mg and Al-5 at%Zn-Mg, in which Mg contents were systematically changed.
In these studies, special attention was paid to the compositions of specimens whether they were two-phase or three-phase alloys at each aging temperature. Since the aging behavior would be different between two-phase and three-phase alloys, the two-phase alloys should be required for the quantitative studies of the above mechanism.
The results obtained were as follows:
(1)The compositions of Mg limit(between two-phase and three-phase alloys)in each alloy system were determined as a function of temperature by means of X-ray analysis and resistivity and calorimetric measurements. The results revealed that all specimens, which showed suppression phenomena in previous investigations, were surely three-phase alloys at each aging temperature.
(2) It was confirmed that the aging curves of the two-phase specimens did not show any suppression in the initial aging rate in quite the same way as in Al-Zn binary alloys. Whereas, in three-phase specimens, the suppression was more marked with the increase of Mg content.
(3) The suppression phenomena observed in three-phase alloys could be explained by the slow rate of formation of the 2nd G. P. zone, which would have appeared during the aging probably corresponding to θ (Mg₂Zn₁₁) stable phase.
(4) As the results, the previous theories which explained the retardation of the initial aging rate in Al-Zn-Mg alloy system on the assumption of interaction between vacancy and Mg atom were proved to be erroneous.

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