Accession Number : AD0763511

Title :   Oxidation Properties of a Zirconium-2.7 w/o Niobium Alloy in the Temperature Range 650 Degrees-1000 Degrees C,

Corporate Author : MCMASTER UNIV HAMILTON (ONTARIO) DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Urbanic,V. F. ; Smeltzer,W. W.

Report Date : 06 JUN 1972

Pagination or Media Count : 5

Abstract : The reaction kinetics and structures of the alloy/oxide composite system were determined for a Zr-2.7 weight per cent Nb alloy exposed at temperatures over the range 650-1000C in oxygen at 1 atm pressure. These kinetics may be represented by a parabolic-linear relationship. The zirconia scales contained small amounts of the intramolecular oxide, 6ZrO2-Nb2O5. An investigation was carried out on the morphological development of the columnar scale and the underlying layer of oxygen stabilized alpha-Zr plates in the beta-Zr alloy during parabolic oxidation. The sequence of the reaction product layers was consistent with predictions from the Zr-Nb-O phase diagram. (Author)

Descriptors :   (*ZIRCONIUM ALLOYS, OXIDATION), NIOBIUM ALLOYS, REACTION KINETICS, MICROSTRUCTURE, CANADA

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE