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Meeting Materials Science & Technology 2020
Symposium High Temperature Corrosion and Degradation of Structural Materials
Presentation Title Environmental Resistance and Microstructure Design in Mo-Si-B Alloys
Author(s) John H. Perepezko
On-Site Speaker (Planned) John H. Perepezko
Abstract Scope The multiphase microstructures in the Mo-Si-B system based upon the Mo5SiB2 (T2) phase with Mo and the Mo3Si phases allow for superior creep strength, in-situ toughening and offer some oxidation resistance. Selected alloying can also be used to develop alternative multiphase microstructures. Since the alloy compositions that exhibit the lowest oxidation rate will most likely not yield optimum mechanical properties, it is important to develop robust and compatible aenvironmental resistant coatings. An effective strategy to address this challenge is based upon a pack cementation kinetic biasing. During oxidation of the (Si+B)-pack alloys, the initial MoSi2 outer layer is consumed by formation of the Mo5Si3 (T1) phase and the underlying T2 and/or boride phase diffusion barrier layer. Any damage to the T1 layer can be recovered from the T2 + MoB layer as a self-healing characteristic. The coating strategy is also applicable to other refractory metals and ceramics.


Corrosion Study of Stainless Steel 316 with Different Coatings in MgCl2-KCl Heat Transfer Fluid
Effect of Al Addition on Oxidation Behavior of a New Mo-Si-B Alloy
Elucidating Influence of Alloy Composition, Thermal Cycling and Environment on Oxidation Behavior of Engine Exhaust Valve Materials
Environmental Resistance and Microstructure Design in Mo-Si-B Alloys
Exploring Materials Options for sCO2 Applications: Steels to Cermets
Influence of the Water Vapor on Oxide Scale and Alpha Case Layer in Ti6Al4V
Introductory Comments: High-temperature Corrosion and Degradation of Structural Materials
Kinetic Modeling of High-temperature Oxidation of Pure Metals by Incorporating Wagner’s Theory into the CALPHAD Approach
Long-term Oxidation Behavior of Chromia-forming Alloys in High-temperature CO2 and Air
Machine Learning and Data Analytics for Accelerating High-temperature, Corrosion-resistant Materials Design
Metal Dusting of Ni-based Alloys at Elevated Pressure in Different Gas Compositions
The Effect of Surface Treatment on the Formation, Structure, and Chemistry of Protective Oxide Scale on High-temperature Oxidation-resistant Nickel Alloys
Thermochemical Stability of EBC Silicates in High-temperature High-velocity Water Vapor

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