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Meeting MS&T22: Materials Science & Technology
Symposium Processing-Microstructure-Property Relationships of Titanium and Titanium Alloys
Presentation Title Slip-twinning Interdependency in High-strength Alpha-beta Titanium Alloys
Author(s) Shaolou Wei, John W. Foltz, Joseph Jankowski, Bhuvi Nirudhoddi, Luis Ruiz-Aparicio, C. Cem Tasan
On-Site Speaker (Planned) Shaolou Wei
Abstract Scope Alpha-beta titanium alloys like Ti-6Al-4V are used because of their high specific-strength. In lower strength alloys like Ti-3Al-2.5V, alpha twinning is commonly observed and leads to higher ductility due to increased number of deformation modes. Alloys with yield strengths above 800 MPa typically do not exhibit alpha twinning, and tend to have poor cold-formability. Recent titanium alloys developed by ATI (ATI 425, ATI Titan 27TM) have demonstrated simultaneously strength above 800 MPa and the activation of twinning in the alpha phase along with interdependent twinning-slip transfer. Interestingly, both alloys contain higher oxygen content than Ti-6Al-4V, and oxygen has previously been linked to suppression of alpha twinning. This presentation primarily aims to explore the micro-mechanical consequences of the interdependent slip-twinning activity, specifically, its influence on plastic strain localization and partitioning. The chemical origin of the twinning mechanism will also be discussed with the assist of density functional theory calculations.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Approaches to Improving Yield-strength without Compromising Strain-hardenability in β-Titanium Alloys
Conventional Ti Alloys for Aeroengines And Aircraft Landing Gear Beams—a Data-driven Analysis for Selection of Ti-based Alloys and Future Directions
Design of New Metastable Ti Alloys and Determinations of Their Deformation Mechanisms Active during Tensile Deformation
Development of High Mechanical Strength and Low Elastic Modulus Ti-Nb-Fe-Sn-Zr Alloy for Orthopedic Implants
Dilatometric Study of Phase Transformations in Ti-407
Enhancing Low-cycle Fatigue Life of Commercially-pure Ti By Deformation At Cryogenic Temperature
Hierarchical Twinning Microstructure in the Metastable β Titanium Alloys
Insights from Three-dimensional Characterization of Twins in Titanium
Microstructure-based Equivalent Initial Flaw Size (m-EIFS) Distributions for Airframe Structural Components
Microstructure Evolution and Mechanical Behaviour of Two Phase (α+β) Ti-6Al-4V Alloy : An Effect of Heat Treatment Temperature and Duration
Nanoindentation Studies and Bulk Mechanical Properties of Additively Manufactured Titanium Alloys
Role of Oxygen on Phase Stability, Precipitation, and Deformation in Beta Titanium Alloys
Slip-twinning Interdependency in High-strength Alpha-beta Titanium Alloys
Tailoring Martensitic Transformation in Metastable Beta-Ti Alloys
Titanium Alloy Microstructures Produced by Additive Manufacturing and Deformation
Using Synchrotron X-ray Characterization to Understand Slip Processes in Titanium Alloys

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