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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2020
Presentation Title Performance of Niobium and Molybdenum Alloys for High Temperature Sensing Applications
Author(s) Scott Riley, Beck Perrine, Ember Sikorski, Lan Li, Richard Skifton, Brian Jaques
On-Site Speaker (Planned) Scott Riley
Abstract Scope Niobium, molybdenum, and their alloys are often considered for applications in extreme environments where corrosion resistance and high temperatures are required. The Idaho National Laboratory has developed thermocouples comprised of phosphorous-doped niobium and lanthana-doped molybdenum thermoelements, an alumina insulation, and a niobium sheath. Prior to operation, the thermocouples undergo a preliminary heat treatment (above the maximum service temperature) in order to stabilize the emf signal. Herein, a study was conducted to evaluate the effects of the stabilization heat treatment (time, temperature, and process gas) on the mechanical properties, microstructure, and chemical stability of the system. A design of experiments was performed to determine the impact of the process variables on thermocouple performance. The grain size of the sheath increased with increasing temperature and time while the ductility decreased with increasing oxygen concentration in the process gas. The chemical stability of each component was studied and will be discussed in detail.
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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