About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Characterizing Intermittent Plastic Events in Ti-7Al Under Creep Loading Using Far-field High-energy Diffraction Microscopy |
Author(s) |
Yuefeng Jin, Amlan Das, Wenxi Li, Katherine Shanks, Ashley Bucsek |
On-Site Speaker (Planned) |
Yuefeng Jin |
Abstract Scope |
Although plasticity is traditionally modeled as a smooth process in space and time, in some hexagonal close-packed materials, plasticity can occur in localized, grain-scale bursts known as intermittent plasticity. In structural titanium-aluminum alloys like Ti-7Al, intermittent plasticity has been shown to occur before macroscopic yield and is the modus operandi for room-temperature creep with important ties to dwell fatigue. In this work, we use far-field high-energy diffraction microscopy (ff-HEDM) to characterize individual grain-scale intermittent plastic events in a Ti-7Al sample during creep loading. To identify intermittent plastic events, we compare three different signatures of local plasticity in ff-HEDM data sets: (1) grain-scale stress relaxation events; (2) grain-scale rotations; (3) changes to Bragg reflection shapes. The results show how intermittent plastic events can be observed in ff-HEDM data sets both spatially and temporally and are used to understand the initiation, evolution, and effects of intermittent plasticity on the material failure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Other, Titanium |