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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium GAT-2017 (Gamma Alloys Technology - 2017)
Presentation Title Origin of Enhanced Ductility of TiAl Alloys: A Hybrid Study on the Deformation Behavior of Gamma Phase in TiAl Alloys Using In-situ Transmission Electron Microscopy Experiments and Molecular Dynamics
Author(s) Seong-Woong Kim, Seung-Hwa Ryu, Jaemin Kim, Young-Sang Na, Seung-Eon Kim, Jong-Taek Yeom, Andrew Minor
On-Site Speaker (Planned) Seong-Woong Kim
Abstract Scope An in-situ transmission electron microscopy study was conducted at room temperature to understand an underlying mechanism on room temperature ductility of TiAl alloys. Also, molecular dynamics simulation was conducted to calculate the stacking fault energy of TiAl alloys and to show which deformation mode is dominant. From in-situ straining transmission electron microscopy experiments, it was revealed that deformation mode is different between the TiAl alloys with/without room temperature ductility. The γ lamellar of TiAl alloys having room temperature ductility was deformed by slip. However, the γ lamellar of TiAl alloys without room temperature ductility was deformed by deformation twin. The difference in deformation mode was explained by stacking fault energy of the TiAl alloys which was calculated by molecular dynamics. Furthermore, the role of lamellar orientation of tensile direction on deformation behavior was examined using Schmid factor of each orientation. The important microstructural factors for room temperature ductility was suggested.
Proceedings Inclusion? Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)


3D Materials Science and Engineering: Emerging Capabilities for Gamma Alloys
Advancement of Plasma Cold-hearth Melting for Production of Gamma Titanium Aluminide Alloys within Arconic
Advances in the Systems and Processes for the Production of Gamma Titanium Aluminide Bars and Powder
Advantages of PM Processing for Gamma Titanium Aluminides
CAE-based Analysis of Structural Integrity for an Industrial Gas Turbine Blade Made from TiAl Alloy
Characterization of a High Nb-TiAl Alloy Components Fabricated by Additive Manufacturing Using Electron Beam Melting
Control of Microstructure and Mechanical Property and Superplasticity for High Nb-TiAl Alloy Sheet
Determination of the Isothermal Sections of the Ti-Al-Nb Ternary System at 1300 ˚C and 1400 ˚C
Development and Application of Gamma TiAl Components
Development of Cost-effective Processes for Gamma-TiAl Application
Effect of Borides on the Beta/Alpha Phase Transformation Kinetics in Gamma Titanium Aluminide Alloys
Effect of Post-Processing on Microstructure and Mechanical Properties of EBM Ti-48Al-2Cr-2Nb
Effect of Surface Condition on the RT Tensile Properties and Oxidation Resistance of TiAl Alloys
F-30: Flow Stress Behavior of Ti-45Al-12Nb Alloy with Ultrafine Grains during Hot Compression Deformation
F-31: Influence of Hot Processing Parameters on Dynamic Recrystallization Behavior of Ti-47Al-2Nb-2Cr Alloy
F-32: Study on the Lamellar Boundary Orientation of Ti-46Al-8Nb Alloy with Various Growth Rate
F-33: Vacuum Brazing of Ti-48Al-2Cr-2Nb
F-34: Joining Process of Gamma-TiAl and Structural Steel with Insert Metals by Friction Welding
F-35: Microstructure and Mechanical Properties of Powder Metallurgy Ti-22Al-25Nb Alloy Fabricated by Hot-pressing Sintering
F-37: Microstructural Evolution and Evaluation of Mechanical Behaviors of the Cast Ti-Al-Mo-Nb-(B, Mm) Alloys
F-40: TiAl-based Intermetallic Alloy with Addition of Zirconium
F-42: Interficial Reaction between TiAl Alloy and Ca(Y)-doped BaZrO3 Crucible
F-43: Atom Probe Investigation of the Partitioning of Impurities in TiAl Alloy
F-45: Fine Structure of Ordinary Dislocation Dipoles and their Evolution in Deformed Gamma-TiAl via Atomistic Simulations
F-46: Hot Working Behavior and Microstructural Evolution of As-cast Ti-42Al-5.5Mn Alloy
F-48: Gamma Phase Nucleation from Stacking Fault in TiAl Alloys
F-51: Characterization of Thermal Deformation Behavior of a Novel Ti-47Al-Cr-2Mn-0.5Fe- 0.05Y Alloy
F-52: Microstructure and Mechanical Properties of High Nb Containing TiAl Alloy Sheets
F-55: Effect of Al Content on the Microstructure and Tensile Properties of Cast Ti-xAl-15Nb-1Mo Alloy
Fatigue Thresholds in γ-TiAl Alloys Produced by Additive Manufacturing
Fine-grained FL Microstructure Evolution/Control and their Tensile Properties in a Cast Beta Gamma Alloy Material
Fracture and Fatigue Crack Growth Behavior of Wrought Gamma Titanium Aluminide Ti-43Al-4Nb-1Mo in Different Microstructure Conditions
Fracture Behavior during Hot Tension Testing of High Nb Containing TiAl Alloys
Gamma Alloy Materials-Process-Microstructure Combinations for Greater Service Temperatures
Gamma Alloy Process-Microstructure Combinations vs. Deformation and Fracture at Ambient as well as Elevated Temperatures
Grain Refinement and Texture Evolution in Boron Containing TiAl Alloys
High-energy Synchrotron Radiation Investigation of the Massive Transformation in a Ti-Al-Nb-Ta Alloy
High Temperature and High Strain Rate Deformation Behavior of Powder Metallurgical TiAl-Nb Composite
High Temperature Mechanical Properties of Polysynthetic Twinned TiAl-Nb Alloys
Hot Forming of Titanium Aluminide Alloys Studied In Situ with Synchrotron Radiation
IC Engine Valves, an Application for Gamma Ti-Al Alloy Technology
Implementation of γ-TiAl Alloys for Low Pressure Turbine Blades: Opportunities and New Challenges
In-situ Experiments to Determine the Creep Law Describing the SPS Densification of a TiAl Powder
Manufacturing Issues in Rapid Thermal Processing of γ-TiAl Alloys
Mechanical Behavior and Microstructure Evolution of Fine-grained High Nb Containing TiAl Alloy under Isothermal Compression
Mechanical Properties and Environment Induced Embrittlement of a High Nb Containing TiAl Alloy
Methodological Discussion on Enhancing the Temperature Tolerance of TiAl Alloys
Microstructure-sensitive Computational Scheme for Fatigue Resistance of Gamma-TiAl TNM Alloys
Microstructure and Mechanical Properties of In-situ TiAl Matrix Composites Reinforced with Ti2AlC Particles
Microstructure and Mechanical Properties of TiAl Alloys Prepared by Cold Crucible Directional Solidification
Microstructure Evolution of Ti-45Al-8.5Nb-(W, B, Y) Alloy during Continuous Cooling and Thermal Aging
Multi-direction Forging and Superplastic Deformation Characteristic of High Nb Containing TiAl Alloys
O-phase in a Lamellar TiAlNb Alloy Produced by Powder Metallurgy
Observation of Modulated Structure in High Nb-containing TiAl Alloy by Synchrotron Radiation and Electron Microscopy
Ordered ω Phase Transformations in High Nb-TiAl Alloys
Origin of Enhanced Ductility of TiAl Alloys: A Hybrid Study on the Deformation Behavior of Gamma Phase in TiAl Alloys Using In-situ Transmission Electron Microscopy Experiments and Molecular Dynamics
Phase Field Simulation of Microstructure Evolution in TiAl
Plastic Deformation Behaviour and Crack Initiation Mechanisms of γ-TiAl in High Temperature, High Cycle Fatigue
Preparation and Electron Beam Welding of Hot Packed Rolled Powder Metallurgy γ-TiAl Sheets
Processing, Microstructure and Mechanical Properties of Beta-gamma TiAl Alloy
Properties at High Temperatures of the IRIS Alloy Densified by Spark Plasma Sintering
R-curve Behaviour of Different Nearly Lamellar Microstructures in an Intermetallic Ti-43.5Al-4Nb-1Mo-0.1B Alloy
Repair of γ-TiAl Turbine Blades by Use of Laser Additive Manufacturing
Research Progress on Gamma TiAl Alloy Technology in NPU
Seeded Growth of Ti-46Al-(3~10)Nb PST Crystals
Solidification of TiAl Alloys with Low Contents of Si
Spark Plasma Sintering of a TiAl Alloy and of Near-net Shape Blades
Study on Milling of a TiAl Alloy under Minimum Quantity of Lubrication Condition
Study on Preparation of Larger Size TiAl Ingot with Oriented Lamellar Microstructure
The Role of Surface Protection for High Temperature Performance of TiAl Alloys
Thermodynamic Modeling of the Ti-Al-Cr-Mo-Nb-B System for Aiding Gamma-TiAl Alloy Design
Three Dimensional Reconstruction of TiAl Microstructures
Titanium Aluminide Investment Casting Technology Development
Titanium Aluminides under High-pressure, High Temperature and during Plastic Deformation: In-situ Studies by Neutron and Synchrotron Quantum Beams
Why Grinding of Gamma Titanium Aluminide Makes Sense?

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