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This Ph. D. thesis deals with the development of near-eutectic Mo-Si-B alloys which were processed by arc-melting and directional solidification. Depending on the processing route the microstructure, mechanical properties and oxidation behavior at high temperatures were investigated. The ternary alloy compositions investigated were taken from the Mo-rich part of the Mo-Si-B system and consist of the molybdenum solid solution phase (MoSS) and the two intermetallic phases Mo₃Si and Mo₅SiB₂. Literature data of the liquidus projection and the cooling behavior were analyzed using the Alkemade theorem and compared with thermodynamic calculations in order to determine the ternary eutectic composition experimentally. The ternary eutectic MoSS-Mo₅SiB₂-Mo₃Si composition was determined to contain 17.5 at.% silicon and 8 at.% - 10 at.% boron and was further processed via directional solidification using a crucible-free zone melting technique. Regarding the mechanical properties, special attention was paid to the creep resistance at high temperatures. Besides this property the hardness of the ternary eutectic as well as the oxidation behavior of the near-eutectic ternary alloys were investigated. As a results of the present work, the near-eutectic alloys show outstanding creep behavior at temperatures between 1100 °C and 1400 °C as well as good oxidation resistance at temperatures higher than 1000 °C.
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Microstructure and properties of near-eutectic Mo-Si-B alloys for high temperature applications, Georg Hasemann
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- 2017
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