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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2016
Presentation Title Stress Accommodation in Plastic Zone Ahead Crack Tip in Iridium
Author(s) Peter Panfilov, Mikhail Yu Gutkin, Elijah N Borodin, Elena A Lyapunova
On-Site Speaker (Planned) Peter Panfilov
Abstract Scope Iridium is the sole refractory FCC-metal (Tmelt=2443C), which cleaves after considerable plastic deformation, and, hence, it may be chosen as the model material for examination of competition between brittle fracture and plastic response in metals. The problem of cleavage crack stability under tension in iridium single crystals is considered in dependence on the length of crack and its angle of opening, the size of plastic zone ahead crack tip and active slip systems here. It was shown that there are two stages of crack evolution in iridium, which are repeated. The first one, materials near power stress concentrator leaves its plasticity during preliminary plastic deformation. The second one, brittle crack advances inside this area. This research is supported by the Russian Science Foundation (#15-19-10007).
Proceedings Inclusion? Planned: A print-only volume


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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