About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Investigating and Validating the Persistence of Deformation Twinning in Haynes ® 244 ® |
Author(s) |
Victoria Tucker, Thomas Mann, Andrew Roginski, Ignacio Escobar, Biaobiao Yang, Zheng Ye, Michael Fahrmann, Ilchat Sabirov, Javier Llorca, Michael Titus |
On-Site Speaker (Planned) |
Michael Titus |
Abstract Scope |
Superalloys exhibit varying deformation mechanisms with changes in temperature and strain rate. Haynes 244 stands out due to its consistent mechanism of deformation twinning. This distinctive behavior is attributed to the presence of the Ni2(Cr, Mo, W) γ’’’ intermetallic phase within the alloy. Unlike traditional γ’-strengthened superalloys, where deformation typically initiates in the disordered γ matrix and progresses to the γ’ precipitates, our findings indicate that in Haynes 244, twinning initiates within the γ’’’ precipitates and extends into the surrounding matrix. Our study validates previous hypotheses on twin formation using advanced techniques such as high-resolution scanning transmission electron microscopy (HR-STEM), in-situ transmission electron microscopy (TEM) testing, and high-rate testing. Contrary to conventional literature where twinning is often considered deleterious, our work highlights twinning as a novel and significant behavior across temperatures up to the precipitate dissolution temperature and strain rates as high as 500 s-1. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Characterization, Mechanical Properties |