日本金属学会誌

J. Japan Inst. Metals, Vol. 16, No. 9 (1952),
pp. 495-499

Study on the Recrystallization Temperature of Refined High Purity Aluminium (7th Report) On the Abnormal Hardening on the Annealing Curve

Namio Kawashima1 and Yuzo Nakamura1

1Toyo Aluminium K.K.,

Abstract:

This paper deals with the abnormal hardening phenomena on the annealing curves of pure aluminium (99.5 ∼ 99.998 %) which have not yet been brought clearly to light. An abnormal hardening at lower temperature was clearly observed in the aluminium of 99.92 % purity which had undergone a lighter reduction less than 50 %, but it could not be recognized in the case of such a heavier reduction as 90 %. And the second abnormal hardening or incubation period was observed in all pure aluminiums. By X-ray analysis, it was ascertained that the beginning temperature of recrystallization exists in the incubation period or in the neighbourhood of second abnormal hardening.


(Received 1952/6/5)

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