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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2016
Presentation Title Microstructure and Properties of a Ternary Eutectic Mo-Si-B Alloy
Author(s) Georg Hasemann, Florian Gang, Martin Palm, Iurii Bogomol, Manja Krüger
On-Site Speaker (Planned) Georg Hasemann
Abstract Scope The present work addresses Mo-Si-B alloys which are located in the so-called “Berczik triangle” and consist of a three-phase microstructure with a Mo solid solution phase (MoSS) and the two intermetallic phases Mo5SiB2 (T2) and Mo3Si. The aim of the present study is to find the ternary eutectic composition which is expected to combine properties such as high strength and an excellent creep resistance with a well-defined microstructure. Different alloy compositions in the respective primary solidification areas of the MoSS, T2 and Mo5Si3 phases were chosen to investigate the microstructural evolution. The alloys were produced by arc-melting and investigated using SEM-BSE images and EPMA measurements. The results were compared to thermodynamic calculations of the liquidus projection and isopleth phase diagrams using the software FactSage™. By carrying out these experiments it was possibly to determine the ternary eutectic point, which was found to have a nominal composition of Mo-17.5Si-8B (at.%).
Proceedings Inclusion? Planned: A print-only volume


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