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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2020
Presentation Title Intermetallic Precipitate Reinforced Refractory Metal Alloys toward ‘bcc-superalloys’
Author(s) Alexander J. Knowles, Chris Hardie, David Dye
On-Site Speaker (Planned) Alexander J. Knowles
Abstract Scope New materials with improved high temperature performance are sought for nuclear fusion/Generation-IV fission reactors and gas turbines. Refractory metals have exceptionally high melting points >2000C, far higher than nickel-based fcc-superalloys, <1400C. However, they do not exploit ordered-intermetallic precipitates, which is a potent strategy in γ-γ’ fcc-superalloys for strength, creep resistance and ductility. There is great scope for the exploitation of this strategy in bcc metals, including within compositionally complex alloys (CCAs, or high entropy alloys, HEAs). Opportunities for precipitate reinforcement of refractory metal alloys will be discussed. New design strategies exploit the two-phase field bcc β (Ti) to β’ TiFe, whereby precipitates can be produced within a matrix of β (Mo,Ti) and also β (W,Ti). Such precipitation offers superalloy-like β-β’ microstructures where understanding in being developed for (1) Microstructure control, (2) Properties achieved and deformation mechanisms. Such work is critical to realise bcc-superalloys as a new materials class.
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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