アルミニウムの疲労破壊に及ぼす大気の影響

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タイトル別名
  • Effect of Atmospheric-Corrosion on Fatigue Fracture of Aluminum
  • アルミニウム ノ ヒロウ ハカイ ニ オヨボス タイキ ノ エイキョウ

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In order to clarify the effect of atmospheric-corrosion on fatigue fracture of metal, the fatigue test has been carried out on aluminum under reversed plane bending at the conditions of ambient pressure and 6×10-5 Torr. The difference of fatigue failure modes at these two environment was observed by optical and scanning electron microscopy, and the fatigue process during stress cycling of single crystal specimens was examined using the back reflection X-ray Laue method.<br>The concentration of oxygen atoms adsorbed on the fracture surface was measured by using the X-ray micro-analyzer and the dark deposit on the fracture surface of the specimen tested in air was identified with the electron diffraction technique. The decrease of fatigue strength of aluminum in air was discussed from mechanochemical view points.<br>The main results obtained are as follows:<br>(1) The fatigue strength of alminum was increased by evacuating the air surrounding a specimen. The values of surface roughness and micro-Vickers hardness of the specimen tested in vacuum were higher than those in air.<br>(2) The change of Laue asterism obtained on the single crystal specimen tested in vacuum was very intensive than that in air.<br>(3) The concentration of oxygen atoms adsorbed on the fracture surface was very high on the specimen tested in air, but low in vacuum.<br>(4) It was found from the electron diffraction analysis that the dark deposit on the fracture surface of specimen tested in air was the aggregate of fine particles of gamma-alumina having about 0.02∼0.05μm in diameter. No deposit was seen on the fracture surface of specimen tested in vacuum.

収録刊行物

  • 材料

    材料 25 (271), 363-369, 1976

    公益社団法人 日本材料学会

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