Abstract
The phase formation behavior during solidification in the Mo-Si-B system was experimentally examined around the triple junction point (T) of the Mo solid solution (Moss), Mo5SiB2 (T2) and Mo2B primary phases in the Mo-Si-B liquidus projection suggested by Yang and Chang through thermodynamic calculations, and the solidification routes of the Mo-Si-B alloys were reconsidered based on the obtained results. Alloys of four different compositions around the T point were produced by arc-melting. The primary phases observed in these alloys were in excellent agreement with the liquidus projection proposed by Yang and Chang. The solidification routes were basically Moss (primary) → Moss + Mo2B → Moss + T2 eutectic -+ Moss + T 2 + Mo3Si (A15), T2 (primary) → Mo ss + T2 eutectic → Moss + T2 + A15, or Mo2B (primary) → Moss + T2 eutectic → Moss + T2 + A15, depending on the composition. However, a quantitative EPMA analysis indicated the compositions of the Moss + T2 eutectic and Moss + T 2 + A15 phases differed from the reported liquidus projection. This is due to the difficulties interpreting the unusual solidification routes in the Mo-Si-B system and their as-cast microstructures.
Original language | English |
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Pages (from-to) | 1699-1704 |
Number of pages | 6 |
Journal | Materials Transactions |
Volume | 51 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2010 Sep |
Keywords
- Calibration
- Eutectic
- Liquidus projection
- Molybdenum-silicon-boron system
- Quantitative analysis
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering