日本金属学会誌

J. Japan Inst. Metals, Vol. 17, No. 3 (1953),
pp. 108-113

Study on the Selective Oxidation of Cu-Al Alloys by Electron Diffraction

Denjiro Watanabe, Shiro Ogawa and Takashi Kimura


Abstract:

The surface products due to the selective oxidation of Cu-Al alloys (1 ∼ 10%Al) heat-treated at 500 ∼ 800° for 15 min in hydrogen stream saturated with water vapour were examined by the electron diffraction method. In case of specimens which highly resisted the discolouration the patterns obtained did not agree with that of γ -Al2O3, but were similar to that obtained previously by Harrington et al. The subsequent gas-heating of these surfaces caused the films to change into γ -Al2O3 which had, however, a lattice symmetry slightly different from that of the ordinary spinel type. The refraction effect of electrons due to minute crystals of CuO produced on the alloy surface was also observed.


(Received 1952/11/11)

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