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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2020
Presentation Title Modifying Grain Boundary Cohesion in Ultra-fine Grained Tungsten and Tungsten-based Nanocomposites through Systematic Doping
Author(s) Michael Wurmshuber, Simon Doppermann, Stefan Wurster, Reinhard Pippan, Daniel Kiener
On-Site Speaker (Planned) Michael Wurmshuber
Abstract Scope The inherent brittleness and low ductility of tungsten often impedes its applicability in high-performance installations. A promising approach to improve mechanical strength is refining the microstructure to the ultra-fine grained regime. However, the large amount of interfaces within such materials promotes intergranular crack paths with comparably low crack growth resistance, hindering a severe improvement in toughness and ductility. Therefore, strengthening grain boundary cohesion by doping with certain elements is expected to enhance the performance. In this work, a powdermetallurgical fabrication route in conjunction with severe plastic deformation was applied to produce ultra-fine grained W, commercially pure as well as doped with potentially interface-strengthening elements. Additionally, nanocrystalline W-Cu composites with tailored interface chemistry were fabricated, adding a ductile phase for increased plasticity. Mechanical properties of all materials were thoroughly characterized applying small-scale testing techniques and the effectiveness of grain boundary chemistry tuning on the ductility of tungsten based materials is discussed.
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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