Abstract
Oxidation internal stresses were analysed by X-ray diffraction method on a NiCr alloy oxidized for 24 h at 900°C under various oxygen pressures. The results indicate that the metallic substrate is submitted to compressive stresses. Three models were developed in order to explain these results: the first one is related to internal oxidation phenomena, the second to a creep effect and the third to a Cr gradient composition effect. It is concluded that a great attention must be paid before drawing interpretations from the X-ray diffraction results about stress measurement of oxidized systems.
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