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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2016
Presentation Title High Temperature Properties of Directionally Solidified Nb-rich Nb-Si-Cr Eutectics
Author(s) Florian Gang, Martin Heilmaier
On-Site Speaker (Planned) Florian Gang
Abstract Scope Niobium silicide based alloys are promising materials to replace Ni-based superalloys in high temperature structural applications. Unfortunately, good mechanical strength and oxidation resistance at elevated temperatures are difficult to be achieved simultaneously. This challenge may be met by directional solidification (DS) of eutectic alloy compositions. It is well known that DS processing, especially of eutectic alloys, can lead to enhanced creep lifetimes, whereas the oxidation resistance may be improved by the fine-lamellar phase distribution. For this reason, eutectic compositions of the ternary system Nb-Si-Cr are directionally solidified employing a vertical float zone process. The influence of varying processing parameters on the resulting microstructures is assessed. Compressive creep tests in vacuo under constant stress at temperatures up to 1300 C give insights into acting creep deformation mechanisms and demonstrate the potential of DS by comparison with arc-melted samples. Likewise, reasons for the improvement of the oxidation resistance will be discussed.
Proceedings Inclusion? Planned: A print-only volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Effect of Silicon on Texture of Niobium
Etched Surface of CVTD Single Crystal Tungsten Coating after Serving under High Temperature
Fracture of Severely Plastically Deformed Niobium and Tantalum
High Temperature Properties of Directionally Solidified Nb-rich Nb-Si-Cr Eutectics
Improving the Performance of Nb-Silicide Based Refractory Alloys through a Novel Cold Crucible Directional Solidification
Influences of Rare Earth on Microstructures and Mechanical Properties of Functionally Graded Cemented Carbides
Introduction of Precisely Controlled Microstructural Defects into SRF Cavity Nb Sheet and Their Impact on Local Superconducting Properties
Manufacturing of Bulk Ultrafine Grain Tungsten from Nanocrystalline Tungsten Powder and Its Potential Application for Nuclear and Fusion Reactors
Mechanical Properties of Cold-rolled Tungsten at Different Strain Rates
Micro-Mechanical Characterization of Micro-Architectured Refractory Metal Coatings
Micromechanical Testing of Multi Compositional Tungsten Thin Film Alloys
Microstructure and Properties of a Ternary Eutectic Mo-Si-B Alloy
On Plasticity of Polycrystalline Rhenium at Room Temperature
Reactive Spark Plasma Sintering of Tungsten Borides Using Elemental Tungsten and Boron Powders
Size Effect of Intermetallic Compounds on Fracture Toughness of Mo-Si-B Alloys
Stress Accommodation in Plastic Zone Ahead Crack Tip in Iridium
The Initiation and Propagation of Dynamic Abnormal Grain Growth in Refractory Metals
Thermally Activated Deformation Processes in Body-Centered Cubic Cr – How Microstructure Influences Strain-Rate Sensitivity

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