About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Sharpening Our Focus on Diffuse Scattering: Partial Ordering and Nanoscale Planar Defects in Multi-principal Element Alloys |
Author(s) |
Po-Cheng Kung, Kaijun Yin, Jian-Min Zuo, Jessica Krogstad |
On-Site Speaker (Planned) |
Po-Cheng Kung |
Abstract Scope |
The structure and nature of chemical short-range ordering (CSRO) in multi-principal element 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 method 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 types of diffuse scattering. We demonstrate that one type arises from partially ordered L12 domains, while the other type results from nanoscale planar defects rather than CSRO. We also examine a commercial Fe21Cr6Ni9Mn austenitic stainless steel using the same procedure, and find much weaker evidence of CSRO and no nanoscale planar defects. These results indicate that CSRO and nanoscale planar defects could be specific features of multi-principal element alloys and could both account for their exceptional mechanical properties. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Iron and Steel, Characterization |