J. Phys. IV France
Volume 124, Mai 2005
|Page(s)||1 - 7|
J. Phys. IV France 124 (2005) 1-7
SEM-EDS and XRD study of a NiCrAlU alloy at temperatures from 800C to 1200CH. Al-Badairy and P. Fox
MSERC, Department of Engineering, The University of Liverpool, Liverpool L69 3GH, UK
The oxidation behaviour of a nominally 74.5wt%Ni, 20wt%Cr, 5wt%Al and 0.5wt%U alloy was examined using Scanning Electron Microscopy with X-ray Energy Dispersive Spectroscopy (SEM-EDS) and X-ray Diffraction (XRD). The oxidation temperature ranged from 800C to 1200C in air, with oxidation times of up to 120 h. Analysis showed that during short term oxidation (40 h), at the lower temperatures, oxides of Cr, Ni and Al were formed. With increasing oxidation time, the Cr-rich oxide scale became predominant with only a few regions of Ni-rich oxide being observed. No uranium was detected, using EDS, within the outer scale. The scale formed was normally flat but with spallation occurring after 40 h oxidation at 900C, with more spallation and some convolution being observed with increasing temperature and time.
Key words: oxidation, spallation, internal oxidation zone, uranium.
© EDP Sciences 2005