About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Advances in Multi-Principal Element Alloys III: Mechanical Behavior
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Presentation Title |
Constituent Phase Assessment of Composition Interspace between a MnFeCoNiCu Alloy and Nickel Alloy 738LC by Synchrotron XRD |
Author(s) |
Benjamin Schneiderman, Andrew Chihpin Chuang, Zhenzhen Yu |
On-Site Speaker (Planned) |
Benjamin Schneiderman |
Abstract Scope |
To understand performance of multi principal element alloys (MPEAs), thorough assessment of their constituent phases is essential. However, MPEA phase identification from x-ray diffraction (XRD) profiles presents significant challenges, especially when interfaced with conventional highly alloyed materials. These challenges include peak shifts due to elemental substitution, and composition variation among unit cells, both limiting the effectiveness of Rietveld refinement. Here, an approach to analyze synchrotron XRD profiles was demonstrated on the composition interspace between a MnFeCoNiCu MPEA and nickel alloy 738LC, with intermixing generated by laser welding. First, using predictions from CALPHAD simulations, a twelve-phase system-specific diffraction library was constructed, incorporating a statistical hard-sphere model to estimate lattice parameters of disordered cubic phases. A large synchrotron dataset encompassing the composition space was then compared. With consistent and explainable deviations from expected peak positions considered, 99% of both high and low-intensity peaks were assigned to phases within the CALPHAD-based library. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Joining, Other |