Effect of Nb and W substitutions on the stability of the A15 Mo3Si phase
| Title | Effect of Nb and W substitutions on the stability of the A15 Mo3Si phase |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | Ray PK, Ye YY, Akinc M, Kramer MJ |
| Journal Title | Journal of Alloys and Compounds |
| Volume | 537 |
| Pages | 65-70 |
| Date Published | 10 |
| Type of Article | Article |
| ISBN Number | 0925-8388 |
| Accession Number | WOS:000306693100012 |
| Keywords | coatings, DEGREES-C, enthalpy, intermetallic compounds, intermetallics, microstructure, mo-si, molybdenum silicides, OXIDATION BEHAVIOR, phase transformations, si-b alloys, SILICIDES, thermodynamic properties |
| Abstract | 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 |
| DOI | 10.1016/j.jallcom.2012.04.109 |
| Alternate Journal | J. Alloy. Compd. |
