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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2020
Presentation Title Pressureless Sintering and Microstructure Evolution of Ultrafine-grained Tungsten
Author(s) Yanhao Dong, Xingyu Li, Lin Zhang, Ju Li
On-Site Speaker (Planned) Yanhao Dong
Abstract Scope Pressureless sintering of refractory metals is a cost-effective way to produce large parts with complex geometry, yet it is not easy especially when ultrafine grain sizes are preferred. Here we report interesting low-temperature pressureless sintering data of pure tungsten (99.9%) in flowing hydrogen, ending with 99% theoretical density, 700 nm grain size and uniform microstructure. No texture, abnormal grain growth, second-phase impurities or grain-boundary liquids were observed. We found parabolic grain growth in dense samples and calculated grain boundary mobility deviates from Arrhenius-type relationship showing apparent transition at 1400 oC. As a result, sintering below 1400 oC is more favored with respect to grain growth, which provides phenomenological explanation for our low-temperature sintering data. Lastly, Vickers hardness and its Weibull modulus of low-temperature sintered samples are greatly improved, due to finer and more uniform microstructure. Parallel studies are in progress for other refractory metals and shall be discussed as well.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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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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