J. Phys. Colloques
Volume 49, Numéro C6, Novembre 198835th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ
|Page(s)||C6-385 - C6-390|
J. Phys. Colloques 49 (1988) C6-385-C6-390
ATOM PROBE INVESTIGATION OF THE OXIDATION OF Ni-Zr INTERMETALLIC COMPOUNDSE.M. PERRY1, D.L. COCKE1 et M.K. MILLER2
1 Department of Chemistry, Texas A and M University, College Station, TX 77843, U.S.A.
2 Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376, U.S.A.
The initial stages of oxide formation on Ni-Zr intermetallic compounds were examined by atom probe field-ion microscopy (APFIM). Ni5Zr, Ni7Zr2 and Ni3Zr were oxidized at temperatures up to 300°C and O2 pressures ~10 Pa. Composition depth profiles of the oxide layers were examined for surface composition and structure. Oxygen concentration fluctuations in the oxide layer indicated a broad metal-metal oxide interface and, for Ni5Zr, an oxygen depleted layer in the near surface region. Surface enrichment of Zr was detected in some oxides.