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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Grain Boundary Segregation Engineering in Technically Pure Molybdenum Examined via Three-point Bending Tests
Author(s) Severin Jakob, Thomas Weissenboeck, Anton Hohenwarter, Alexander Lorich, Wolfram Knabl, Reinhard Pippan, Helmut Clemens, Verena Maier-Kiener
On-Site Speaker (Planned) Severin Jakob
Abstract Scope Molybdenum has highly advantageous functional and high-temperature properties. However, plastic deformation is limited due to its tendency for brittle, intercrystalline failure, especially at low temperatures. It is well known that segregations have a decisive effect on grain boundary cohesion. An advanced approach for the improvement of the boundaries is segregation engineering, e.g. the deliberate addition of cohesion enhancing elements. To investigate crack formation, three-point-bending tests on recrystallized commercially pure and boron micro-doped molybdenum were conducted between -28C and RT. The tensile-loaded top surface of the specimens are examined post-mortem close to the final fracture plane via scanning electron microscopy. The occurring, mainly intergranular, separations of grains are investigated for distinct features such as crystallography and length of open boundaries. The chemical composition of the interface is complementary measured by atom probe tomography. Necessary requirements for a direct comparison between the material variants and the effect of boron doping are discussed.
Proceedings Inclusion? Planned:


Bending Creep Deformation of ODS MoLa with 0.6 vs 1.1 wt.%La
Design of BCC High-entropy Alloys with Low Neutron Absorption Cross-section
Design of MoWTaTiZr Refractory Multi-principal Element Alloys
Development of Heat-treatable Crss-Cr3Si-based Alloys: Microstructure, Oxidation, and Creep
Development of Novel Chromium-superalloys Strengthened by B2 Intermetallic Precipitates
Effect of Heating Rate and Substrate on the Oxidation Behavior of Hafnium Aluminum Diboride Thin Films
Flow Behavior and Associated Microstructures of Niobium at 1200 to 1500°C
Grain Boundary Doping as Effective Method to Improve Mechanical Properties in Ultra-fine Grained Tungsten
Grain Boundary Segregation Engineering in Technically Pure Molybdenum Examined via Three-point Bending Tests
High-throughput Engineering of Oxidation Behavior in Complex Refectory Alloys
NanoPhase Separation Sintering in Mo and Mo-W Based Systems
Nanostructured Tungsten Alloys for Nuclear Fusion
Oxidation Behavior of Mo-Si-B-Al Alloys at Elevated Temperature
Platinum-based Superalloys: Combating High Temperatures and Aggressive Environments
Realizing Sub-micron Tungsten and Tungsten Composite Microstructures via Deformable Punch Spark Plasma Sintering
Refractory High Entropy Alloys for Applications in Extreme Environments
Studies on the Phase Formation of Cobalt Contacted with Zinc Vapour
Sustainability-based Selection of Materials for Refractory High Entropy Alloys
Tensile Properties of Molybdenum & ODS MoLa Sheet at Elevated Temperatures
The Influence of Impurities on the Interfacial Chemistry of Niobium – Alumina High-temperature Refractories
Thermal Stability of Thin Rolled Potassium-doped Tungsten Sheets at Temperatures between 1100 C and 1400 C
Tungsten Grain Optimization and Composite Fabrication for Use in Fusion Reactors

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