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Meeting Materials Science & Technology 2019
Symposium Ultra High Performance Metallic Systems for Aerospace, Defense, and Automotive Applications
Presentation Title Evolution in Mechanical Response, Phase Transformation and Texture of Titanium Aluminide processed by High-Pressure Torsion
Author(s) Jae-Kyung Han, Xi Li, Rian Dippenaar, Klaus-Dieter Liss, Megumi Kawasaki
On-Site Speaker (Planned) Jae-Kyung Han
Abstract Scope Processing of an ultrafine-grained γ-based Ti-45Al-7.5Nb intermetallic compound was conducted at room temperature by high-pressure torsion (HPT) through 10 turns under a compressive pressure of 6.0 GPa. Successful grain refinement was introduced into a thin, 10 mm diameter disk containing a duplex microstructure by attaining ultrafine laths with thicknesses of 40-100 nm after 10 HPT turns. Micro-mechanical response was examined by a novel nanoindentation technique. The occurrence of phase transformations and order-disorder phase transitions were detected by lab-scale X-ray diffraction and neutron diffraction analyses at different through-thickness sections within the processed samples. Close scrutiny revealed that the phase transformations and order/disorder phase transitions vary gradually from the sample surfaces to the core and hence, a significant heterogeneous texture develops as a result of HPT processing. This study demonstrates considerable potential for utilizing HPT processing for achieving enhanced microstructural development, improved, mechanical properties and control of texture in Titanium Aluminides.
Proceedings Inclusion? Definite: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Bulk-state reaction for synthesizing bulk hybrid alloys through high-pressure torsion
Cold Work-Induced Strain Glass States in Ni49.5Ti50.5 SMA Plates
Deformation Behavior of Al0.4CoCrFeNi High Entropy Alloy
Development of Nb-Si Based Ultrahigh Temperature Alloys
Development of Novel Castable Structural Aluminum Alloys for Elevated Temperature Applications
Effect of Thermal History on Mechanical and Wear Properties of Bulk Metallic Glass Spacecraft Components
Effects of Pd Addition to High Strength NiTiHf Shape Memory Alloys
Evolution in Mechanical Response, Phase Transformation and Texture of Titanium Aluminide processed by High-Pressure Torsion
First-principles Methods of Investigating Stacking Fault Energies in Refractory BCC High-entropy Alloys
Hierarchical Nanoporous Metals
In-situ Studies of Strain Rate Effects on Phase Transformations and Microstructural Evolution in β-Titanium
Influence of Equal-Channel Angular Pressing on the microstructure, the corrosion and the fatigue-corrosion behavior of a 6xxx aluminum alloy for automotive conductors
Location-Specific Mechanical Property Enhancement of Atomically Ordered Fe-Co-V Soft Magnetic Alloys
Macroscopic Ferroelastic Response of Processing-Induced Strain Glass Alloys under Tension, Compression, and Bending
Mechanical Behavior of Mo Solid Solutions with Minor B and Si Additions
Mechanism Controlled Rolling
Microstructural Characterization and High Temperature Oxidation of High Entropy Nb-Cr-W-Ta-V alloy between 600 and 1400oC
Multi Length-scale Mechanical Property Measurements in Ti-based Bulk Metallic Glass-matrix Composites (BMG-MCs): New Insights on Deformation Mechanisms in the Glass Phase
Nanoindentation Measurements of Crystal Orientation Anisotropy in Elastic and Plastic Properties of Ti-Pt-Ni-Hf Shape Memory Alloys
Outstanding Fracture Toughness and Fatigue Strength of a Cast Al-Cu Alloy Promoted by Nanoparticles
P2-86: Combinatorial Studies on Refractory High-entropy Alloys via Directed Vapor Deposition
P2-87: Improvement of Technological Processes Obtaining a Heat-resistant Nickel Alloys for Turbine Blades Using Foundry Return
P2-88: Improvements in Mechanical Properties of Aerospace Grade Al-Li Alloys Through the Application of High-Pressure Torsion
Precipitate Formation Mechanisms During High-Shear Solid Phase Processing Events
Role of Cu Content in Determining the Mechanical Behavior of Cast Al-Cu-Mn-Zr Alloys
Solid Phase Processing of Copper/Graphene Alloys with Ultra-high Conductivity
Structures Formed under High Strain Deformation of Ni-based Superalloys
Thermal behavior of ultra-fine gradient microstructure via severe plastic deformation
Titanium Alloys with Radially Distributed Porosity and Structural Hierarchy

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