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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2020
Presentation Title Microstructure, Microhardness and Oxidation Behavior of Mo-Si-B alloys in the Moss+Mo2B+Mo5SiB2 Three Phase Region
Author(s) Longfei Liu, John H. Perepezko
On-Site Speaker (Planned) Longfei Liu
Abstract Scope A series of Mo-Si-B alloys in the Moss+T2 (Mo5SiB2)+Mo2B three phase region were designed to examine the effect of the lower Si solubility limit in the Moss phase on the microstructure, hardness and oxidation behavior. SEM images establish the microstructure evolution during the annealing. The analysis of the Vickers hardness tests demonstrate that the samples in the Moss+Mo2B+T2 three phase region have about a 50% higher fracture toughness than comparable samples in Moss+Mo3Si+T2 three phase region due to the lower Si solubility in the Moss phase . The thermogravimetric analysis results show that the oxidation resistance directly related to T2 phase fraction. Alloys with a Moss+Mo2B+T2 microstructure exhibit a similar oxidation behavior to those with a Moss+Mo3Si+T2 microstructure when the T2 phase fraction in the two alloys is similar. Mo-Si-B alloys in the Moss+Mo2B+T2 three phase region could achieve better mechanical properties and are attractive candidates for high temperature applications.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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