Cu-Al系2元合金における過共析組成の恒温変態について

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タイトル別名
  • On the Isothermal Transformation of the Hyper-Eutectoid Compositions in Cu-Al Binary Alloys
  • Cu-Alケイ 2ゲン ゴウキン ニ オケル カキョウセキ ソセイ ノ コウオン ヘンタイ ニ ツイテ

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In the previous report, the authors tried to obtain the T/T/T-diagrams for two kinds of Cu-Al binary alloys containing 11.44 wt% and 12.18 wt%Al respectively. And it was found that some complex phenomena occurred with the decomposition of the β phase at the temperature below the eutectoid temperature. In consideration of the results of this experiment, the following processes may be deemed reasonable. When Th>Tc, β→α or γ2+E and when Th<Tc, β→β1+α→E+α. Th and Tc stand for the temperature of holding and the critical temperature of β→β1, respectively. It has been shown that the transformation β→β1 preferentially proceeds at the temperature below Tc, and some characteristic structures, the so-called rosettes or granular precipitates and sheaths enveloping α have appeared with the formation of β1. Now, to confirm these phenomena again, the authors have carried out some experiments for obtaining the T/T/T-diagrams for the specimens of 12.49 wt%, near the ideal Cu3Al composition, and of 12.96 wt%Al content. From the present experimental results, it was found that the transformation β→β1 predominantly proceeds at the temperature below Tc causes the alteration of Al concentration, and then the eutectoidal decomposition occurs directly from the β phase of the alloy containing 12.49 wt%Al. Some discussions about the mechanism of the transformation β→β1 in Cu-Al binary alloys are appended.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 24 (11), 752-755, 1960

    公益社団法人 日本金属学会

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