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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2020
Presentation Title Seeking Toughness in Mo-Si-B: Composites of Stable Oxides
Author(s) Peter E. Marshall, Sharvan Kumar, Xiang Yu, Alex Jackson
On-Site Speaker (Planned) Peter E. Marshall
Abstract Scope Molybdenum-silicon-boron materials with a metallic matrix are candidates for high temperature structural applications requiring oxidation resistance, strength, and toughness. Mo-Si-B itself has a high ductile to brittle transition temperature below which the brittle fracture behavior is problematic. The possibility of improved toughness at these lower temperatures is explored through the addition of thermodynamically stable oxides as a major dispersed phase. Mechanisms will be discussed including extrinsic toughening and changes in the solid solution chemistry. Utilizing powder processing for this composite allows for considerable flexibility in the overall composition and that of the individual phases. Of particular importance are the overall silicon and boron concentrations as well as their ratio in the intermetallic phases. Through this composition selection, the oxidation resistance and creep strength remain similar to other Mo-Si-B alloys. Additional results on the microstructural dependence of these properties will be presented.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


Alloying for Precipitation Hardening in Chromium
Development of Refractory Complex Concentrated Alloys RCCAs Using Diffusion Couple Approach
Dislocation Multiplication from a Frank-Read Source in Six Body-centered Cubic Refractory Metals
Dynamic Grain Growth in Refractory Metals
Effect of Dislocations and Grain Boundaries on Magnetic Flux Trapping in High-purity Niobium used for Superconducting Radio Frequency Cavities
Effect of Strain Rate on the Anisotropic Tensile Mechanical Properties of High Purity Niobium Single Crystals
Hot Isostatic Pressing of WC-3009 Niobium-Based Refractory Alloy
Intermetallic Precipitate Reinforced Refractory Metal Alloys toward ‘bcc-superalloys’
Mechanical Testing of Tungsten-Steel Laminate Composites for use in Fusion Applications
Microstructure, Microhardness and Oxidation Behavior of Mo-Si-B alloys in the Moss+Mo2B+Mo5SiB2 Three Phase Region
Modifying Grain Boundary Cohesion in Ultra-fine Grained Tungsten and Tungsten-based Nanocomposites through Systematic Doping
Molybdenum Foil Tensile Testing
Performance of Niobium and Molybdenum Alloys for High Temperature Sensing Applications
Pressureless Sintering and Microstructure Evolution of Ultrafine-grained Tungsten
Refractory Alloys 3D Printing for Missile and Space Applications
Seeking Toughness in Mo-Si-B: Composites of Stable Oxides
Static and Dynamic Grain Growth in Niobium at 1200 to 1500℃
The Influence of Dislocation Density on Thermal Conductivity in Pure Niobium from 2-9K
Thermally Activated Deformation Processes in W-Re Alloys
ZrC-W Composites Prepared by Reactive Melt Infiltration of Zr2Cu Alloy into Binder-jet Printed WC Preforms

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