Phase Formation and Solidification Routes Near Mo-Mo<SUB>5</SUB>SiB<SUB>2</SUB> Eutectic Point in Mo-Si-B System

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  • Phase formation and solidification routes near Mo-Mo5SiB2 eutectic point in Mo-Si-B system

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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 + T2 + Mo3Si (A15), T2 (primary) → Moss + 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 + T2 + 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.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 51 (9), 1699-1704, 2010

    The Japan Institute of Metals and Materials

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