Effect of Nb and W substitutions on the stability of the A15 Mo3Si phase

TitleEffect of Nb and W substitutions on the stability of the A15 Mo3Si phase
Publication TypeJournal Article
Year of Publication2012
AuthorsRay PK, Ye YY, Akinc M, Kramer MJ
Journal TitleJournal of Alloys and Compounds
Date Published10
Type of ArticleArticle
ISBN Number0925-8388
Accession NumberWOS:000306693100012
Keywordscoatings, DEGREES-C, enthalpy, intermetallic compounds, intermetallics, microstructure, mo-si, molybdenum silicides, OXIDATION BEHAVIOR, phase transformations, si-b alloys, SILICIDES, thermodynamic properties

A combination of theoretical and experimental studies on the stability of Mo3Si with Nb and W substitutions has been presented in this paper. The first principles calculations suggest that the formation enthalpy of the A15 phase favors Nb substitution up to 37.5 atom %. In case of W substitution, the formation enthalpies increase monotonically. Experimental studies on the other hand, showed that the A15 phase is destabilized when approximately 27.5 atom % Nb is added while 7.5-10 atom % W substitution was sufficient to destabilize A15 phase. It was further determined that upon destabilization of the A15 structure, Nb partitions preferentially to the T1 phase, whereas W partitions preferentially to a solid solution with Mo. (C) 2012 Published by Elsevier B.V.

URL<Go to ISI>://WOS:000306693100012
Alternate JournalJ. Alloy. Compd.