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01139 CHARACTERIZATION OF OXIDATION PRODUCTS ON A ZrFe2-TYPE LAVES INTERMETALLIC EXPOSED TO 200°C STEAM

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Product Number: 51300-01139-SG
ISBN: 01139 2001 CP
Author: D. P. Abraham, N. L. Dietz, and N. Finnegan
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The release of radioactive elements from the stainless steel-15 wt% zirconium (SS-15Zr) metal waste form will be governed by the corrosion behavior of ZrFe2-type intermetallics phases present in the alloy. In this article, oxidation products that formed on a ZrFe2-type intermetallic sample exposed to 200°C steam were characterized by Auger Electron Spectroscopy (AES) and Transmission Electron Microscopy (TEM). The data revealed two oxide layers on the sample surface: an outer crystalline iron-oxide layer and an inner amorphous zirconium-rich layer believed to be zirconium oxide. Thermodynamic considerations indicate that the zirconium-rich layer formed first. The iron-oxide layer appears to have resulted from the diffusion of iron through the zirconium-rich layer to the oxide-vapor interface. Keywords: Intermetallic, Oxidation, Auger Spectroscopy, Transmission Electron Microscopy
The release of radioactive elements from the stainless steel-15 wt% zirconium (SS-15Zr) metal waste form will be governed by the corrosion behavior of ZrFe2-type intermetallics phases present in the alloy. In this article, oxidation products that formed on a ZrFe2-type intermetallic sample exposed to 200°C steam were characterized by Auger Electron Spectroscopy (AES) and Transmission Electron Microscopy (TEM). The data revealed two oxide layers on the sample surface: an outer crystalline iron-oxide layer and an inner amorphous zirconium-rich layer believed to be zirconium oxide. Thermodynamic considerations indicate that the zirconium-rich layer formed first. The iron-oxide layer appears to have resulted from the diffusion of iron through the zirconium-rich layer to the oxide-vapor interface. Keywords: Intermetallic, Oxidation, Auger Spectroscopy, Transmission Electron Microscopy
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