日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 12 (1976),
pp. 1228-1237

Reversion Characteristics of an Al-4%Cu Alloy

Kozo Osamura1, Shigeki Furuichi2, Kan Kanbayashi3, Seizo Takamuku4 and Yotaro Murakami1

1Department of Metallurgy, Faculty of Engineering, Kyoto University, Kyoto
2Graduate School, Kyoto University, Kyoto. Present address: Nippon Kokan K.K., Kawasaki
3Graduate School, Kyoto University, Kyoto. Present address: Furukawa Aluminium Co., Nikko
4Graduate School, Kyoto University, Kyoto. Present address: Sumitomo Electric Co., Itami

Abstract:

X-ray diffuse scattering intensity around the 110 reciprocal lattice point was measured in order to obtain the volume fraction and the mean diameter of precipitates. The discrimination of the precipitated phases was performed by the aid of X-ray Laue analysis and the electron diffraction patterns. The electrical resistivity was carefully measured.
When the alloy was aged for 1000 min at 100°C, G.P.zones precipitated with a mean diameter of 80 Å. During the reversion, these zones dissolved perfectly above 185°C, which is in good agreement with the result of Beton and Rollason. After the perfect dissolution of G.P.zones, the θ' phase precipitated solely and heterogeneously, perhaps at dislocation loops.
By aging for 4000 min at 135°C, the θ'' phase precipitated with a mean diameter of 125 Å. When this alloy was reverted, the temperature at which the volume fraction of precipitates becomes minimum but not zero was 225°C, where the successively precipitated θ' phase exsisted.


(Received 1976/05/26)

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