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Meeting MS&T22: Materials Science & Technology
Symposium Processing-Microstructure-Property Relationships of Titanium and Titanium Alloys
Presentation Title Role of Oxygen on Phase Stability, Precipitation, and Deformation in Beta Titanium Alloys
Author(s) Kathleen Chou, Emmanuelle Marquis
On-Site Speaker (Planned) Kathleen Chou
Abstract Scope Titanium’s reactivity with oxygen presents significant challenges to mechanical performance, including embrittlement caused by oxygen in solid solution. Oxygen modifies the phase formation and precipitation sequences in metastable β titanium alloys, which results in novel mechanical behavior suggestive of potential new application spaces. Compositionally-graded microstructures were created using oxidation followed by ageing to understand oxygen’s influence on ω and α phase precipitation kinetics and morphologies in β Ti-Nb, Ti-15-333, and Ti-15Mo alloys. Elevated oxygen levels induced morphology, number density, and size changes for the ω phase and accelerated α nucleation rate. Notably, oxygen partitioning to ω during ageing resulted in increased resistance of ω to precipitate shearing and suppression of catastrophic failure during micropillar compression. Furthermore, oxygen-induced α refinement provides a pathway to obtain fine α laths for accelerated precipitation strengthening of β Ti alloys. These findings provide design strategies to mitigate detrimental effects from interstitial oxygen and ω precipitation.


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
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
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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