About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
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| Presentation Title |
Making Sense of the Noise: Differentiating Sources of Diffuse Electron Scattering Signals in Chemically Complex FCC Alloys and Why It Matters |
| Author(s) |
Po-Cheng Kung, Tianyu Su, K. Vijayvargia, Rui Feng, Peter Liaw, Jian-Min Zuo, Brian Somerday, Elif Ertekin, Petros Sofronis, Jessica A. Krogstad |
| On-Site Speaker (Planned) |
Jessica A. Krogstad |
| Abstract Scope |
The structure and nature of chemical short-range ordering (CSRO) in chemically complex alloys are still unclear despite extensive investigations, due to the limitations of conventional characterization techniques. In this work, we develop a novel procedure based on 4D-STEM methods, specifically diffuse-scattering fluctuation and correlation (FluCor) analysis, to determine the CSRO structure from diffuse scattering analysis in complex alloys. We apply this procedure to a solution treated (CrCoNi)93Al4Ti2Nb medium entropy alloy, where we observe two distinct, coexisting types of diffuse scattering from localized sources. We also examine a commercial Fe21Cr6Ni9Mn austenitic stainless steel using the same procedure, and compare the results with implications for the mechanical properties of this class of alloys. These observations are supported by atomistic and continuum modeling efforts that contribute to our understanding of the nature of the CSRO and the consequences thereof. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Iron and Steel |