Al-5%Ag合金の復元 アルミニウム合金におけるG.P.ゾーンの成長と復元(第3報)

広瀬 洋一; 浅野 和彦; 平野 賢一

doi:10.2464/jilm.21.7

Reversion in Al-5%Ag alloy

Growth and reversion of G. P. zones in aluminum alloys. (3rd report)

Yoichi HIROSE, Kazuhiko ASANO, Kenichi HIRANO

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JOURNAL FREE ACCESS

1971 Volume 21 Issue 1 Pages 7-11

DOI https://doi.org/10.2464/jilm.21.7

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Published: January 30, 1971 Received: September 24, 1970 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 : Reversion characteristics of Al-5%Ag alloy and the effects of a small amount of Sn were examined by measurements of electric resistivity and tensile strength. It was observed that the resistivity was increased to the maximum, and then, decreased during reversion heat-treatments at 120200°C after ageing at 70°C in the same manner as seen in Al-20%Ag alloy. Sn had no effects on the rate of reversion, especially when the alloy had been aged for a long period at 70°C.
However, different from Al-20%Ag alloy, the resistivity and the strength of Al-5%Ag alloy did not show abrupt changes near 170°C which corrcsponds to ε-η transition temperature of G. P. zones according to Baur and Gerold. Then, it was concluded that ε-η transition temperature in Al-5%Ag alloy was higher than that given by the metastable miscibility gap determined by Baur and Gerold and the reversion was caused by the re-dissolution of G. P. zones. It was contrary to the behavior of Al-20%Ag alloy, in which the reversion is caused by the transition from η into ε.
Diffusion processes during the reversion was discussed in reference to the metastable miscibility gap.
Right : Reversion characteristics of Al-5%Ag alloy and the effects of a small amount of Sn were examined by measurements of electric resistivity and tensile strength. It was observed that the resistivity was increased to the maximum, and then, decreased during reversion heat-treatments at 120200°C after ageing at 70°C in the same manner as seen in Al-20%Ag alloy. Sn had no effects on the rate of reversion, especially when the alloy had been aged for a long period at 70°C.
However, different from Al-20%Ag alloy, the resistivity and the strength of Al-5%Ag alloy did not show abrupt changes near 170°C which corresponds to ε-η transition temperature of G. P. zones according to Baur and Gerold. Then, it was concluded that ε-η transition temperature in Al-5%Ag alloy was higher than that given by the metastable miscibility gap determined by Baur and Gerold and the reversion was caused by the re-dissolution of G. P. zones. It was contrary to the behavior of Al-20%Ag alloy, in which the reversion is caused by the transition from η into ε.
Diffusion processes during the reversion was discussed in reference to the metastable miscibility gap.

Date of correction: July 23, 2008 Reason for correction: - Correction: CITATION Details: Wrong : 1) R. Baur and V. Gerold, Acta Met., 10 (1961) 637
4) K. Hirano, Trans. JIM, 10 (1969) 132
6) R. Baur and V. Gerold, Z. Metallk., 52 (1961) 671
7) M. S. Anand and R. P. Agarwala, Trans. AIME 239 (1967) 1848
8) Th. Heumann and H. Bohmer, J. Phys. Chem. Solid, 29 (1958) 237

Right : 1) R. Baur and V. Gerold, Acta Met., 10 (1961) 637
4) K. Hirano, Trans. JIM, 10 (1969) 132
6) R. Baur and V. Gerold, Z. Metallk., 52 (1961) 671
7) M. S. Anand and R. P. Agarwala, Trans. AIME 239 (1967) 1848
8) Th. Heumann and H. Böhmer, J. Phys. Chem. Solid, 29 (1958) 237

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

Abstract

Reversion characteristics of Al-5%Ag alloy and the effects of a small amount of Sn were examined by measurements of electric resistivity and tensile strength. It was observed that the resistivity was increased to the maximum, and then, decreased during reversion heat-treatments at 120200°C after ageing at 70°C in the same manner as seen in Al-20%Ag alloy. Sn had no effects on the rate of reversion, especially when the alloy had been aged for a long period at 70°C.
However, different from Al-20%Ag alloy, the resistivity and the strength of Al-5%Ag alloy did not show abrupt changes near 170°C which corresponds to ε-η transition temperature of G. P. zones according to Baur and Gerold. Then, it was concluded that ε-η transition temperature in Al-5%Ag alloy was higher than that given by the metastable miscibility gap determined by Baur and Gerold and the reversion was caused by the re-dissolution of G. P. zones. It was contrary to the behavior of Al-20%Ag alloy, in which the reversion is caused by the transition from η into ε.
Diffusion processes during the reversion was discussed in reference to the metastable miscibility gap.

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