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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2016
Presentation Title Improving the Performance of Nb-Silicide Based Refractory Alloys through a Novel Cold Crucible Directional Solidification
Author(s) Hongsheng Ding, Kun He, Shiqiu Liu, Yongwang Kang, Jingjie Guo
On-Site Speaker (Planned) Hongsheng Ding
Abstract Scope Nb-silicide based alloys have high melting point(above 1900℃), low density(6.6~7.2g/cm3), high specific stiffness, good high temperature strength and excellent high temperature creep resistance, which make it one of high temperature structural materials with potential aero-engine applications. However, the room temperature toughness of the alloy is low, and its high temperature strength is not enough. Therefore, it has importantly theoretical and practical significance to prepare alloys with excellent mechanical properties at room and elevated temperature. In this paper, Nb-silicide alloy with composition of Nb-22Ti-16Si-3Cr-3Al-2Hf(at.%) was directionally solidified into square ingots at different processing parameters through a novel cold crucible directional solidification technology. The effect of directionally solidified processing parameters, such as heating power and withdrawal rate, on the microstructure and mechanical properties was analyzed. Results show that the directional structure composed of coupled growth of (Nb,Ti)ss/(Nb,Ti)5Si3 composite can exhibit good tension performance at 1250℃.
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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