Oxidation resistance of B2 rare earth-magnesium intermetallic compounds

TitleOxidation resistance of B2 rare earth-magnesium intermetallic compounds
Publication TypeJournal Article
Year of Publication2008
AuthorsStumphy B, Mudryk Y, Russell A, Herman D, Gschneidner K
Journal TitleJournal of Alloys and Compounds
Volume460
Pages363-367
Date PublishedJul
Type of ArticleArticle
ISBN Number0925-8388
Accession NumberISI:000257212700067
Keywordscrystal structure, intermetallics, kinetics, metals, microstructure, rare earth alloys and compounds, SINGLE-CRYSTAL, yttrium
Abstract

The oxidation behaviors of YMg and CeMg were rneasured in flowing air using the thermal gravimetric analysis technique. Negligible oxidation is observed at room temperature in both compounds. At elevated temperatures, the rare earth metals oxidize preferentially, while the underlying materials transform into Mg-rich intermetallics before the Mg oxidizes to MgO. The oxidation resistance of YMg is several orders of magnitude greater than that of CeMg. The oxidation of YMg follows parabolic kinetics with an activation energy of 104 kJ/mol while that of CeMg obeys a linear law with an activation energy of 136 kJ/mol. (C) 2007 Elsevier B.V. All rights reserved.

DOI10.1016/j.jallcom.2007.06.067
Alternate JournalJ. Alloy. Compd.