日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 12 (1976),
pp. 1199-1205

Clusters in Al-Zn Alloys

Mutsuo Ohta1, Teruto Kanadani2 and Hironobu Maeda3

1School of Engineering, Okayama University, Okayama
2Graduate School, Okayama, University\address{}. Present address: Okayama College of Science, Okayama
3School of Engineering, Okayama University\address{}. Present address: Faculty of Science, Okayama University, Okayama

Abstract:

Several Al-Zn alloys containing 0.041∼4.4 at%Zn were studied by means of measurements of electrical resistivity. The results obtained are as follows: (1) The electrical resistivity increases when the specimen is annealed at temperatures higher than the soluvus temperature of the G.P.zones. This increase of resistivity is due to the formation of clusters. (2) The electrical resistivity of the specimen containing clusters is dependent upon annealing temperature only and independent of quenching temperature. (3) Clusters are formed in very dilute alloys as 0.041 at%Zn at temperatures higher than the solvus temperature of the G.P.zones. (4) The formation energy of vacancy and the migration energy of the Zn atom in the alloys determind by the formation process of clusters are in good agreement with those by the formation process of G.P.zones. (5) In spite of the result (4), it seems that the clusters are not the same ones as the small G.P.zones which are observed in the early stage of aging.


(Received 1975/05/27)

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