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Study of Solidification Pathway of a MoSiBTiC Alloy by Optical Thermal Analysis and In-Situ Observation With Electromagnetic Levitation

Study of Solidification Pathway of a MoSiBTiC Alloy by Optical Thermal Analysis and In-Situ Observation With Electromagnetic Levitation

Hiroyuki Fukuyama, Ryogo Sawada, Haruki Nakashima, Makoto Ohtsuka, Kyosuke Yoshimi

Sci Rep. 2019 Oct 21;9(1):15049.

PMID: 31636372

Abstract:

MoSiBTiC alloys are promising candidates for next-generation ultrahigh-temperature materials. However, the phase diagram of these alloys has been unknown. We have developed an ultrahigh-temperature thermal analyser based on blackbody radiation that can be used to analyse the melting and solidification of the alloy 67.5Mo-5Si-10B-8.75Ti-8.75 C (mol%). Furthermore, electromagnetic levitation (EML) was used for in-situ observation of solidification and microstructural study of the alloy. On the basis of the results, the following solidification pathway is proposed: Mo solid solution (Moss) begins to crystallize out as a primary phase at 1955 °C (2228 K) from a liquid state, which is followed by a (Moss+TiC) eutectic reaction starting at 1900 °C (2173 K). Molybdenum boride (Mo2B) phase precipitates from the liquid after the eutectic reaction; however, the Mo2B phase may react with the remaining liquid to form Moss and Mo5SiB2 (T2) as solidification proceeds. In addition, T2 also precipitates as a single phase from the liquid. The remaining liquid reaches the (Moss + T2 + TiC) ternary eutectic point at 1880 °C (2153 K), and the (Moss + T2 + Mo2C) eutectic reaction finally occurs at 1720 °C (1993 K). This completes the solidification of the MoSiBTiC alloy.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP12006983	Molybdenum boride		12006-98-3	Price

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