Hydrogen and Carbon Effect on Cu-4%at.Be Alloy Oxidised Surface

Saad Belkhiat; Fatiha Keraghel

doi:10.15866/ireche.v8i3.12983

Hydrogen and Carbon Effect on Cu-4%at.Be Alloy Oxidised Surface

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Abstract

Auger electron spectroscopy (AES) has been used to study Be segregation on Cu-4%at. Be alloy surface. In this work, the surface atomic composition was followed as a function of temperature at the surface, in hydrogen atmosphere. The activation energy of Be segregation has been experimentally determined. The result is in agreement with the theoretical value. It has been found that in hydrogen atmosphere, the segregation energy of Be decreases and molecular adsorption occurs at the oxidized Cu-Be alloy surface. Hydrogen and oxygen effects are discussed in terms of formation heats of Be (OH)2, Cu (OH)2, BeH, BeH2 and CuH chemical components in the alloy matrix.
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Keywords

Cu-4%at. Be; segregation energy; Cu (OH) 2; BeH2; BeH; Be (OH)2

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