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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Element Alloys V: Mechanical Behavior
Presentation Title Mapping Deformation Mechanisms in Multi-Phase BCC MPEAs via In-Situ TSEM and 4D-STEM
Author(s) Julia T. Purstl, Kirmina Monir, Nicoḷ Maria della Ventura, Ravit Silverstein, Arda Genc, Tresa M. Pollock, Daniel S. Gianola
On-Site Speaker (Planned) Julia T. Purstl
Abstract Scope Contrary to the original design principles of high-entropy and multi-principal element alloys (MPEAs) that emphasized single-phase solid solutions, an increasing number of studies focus on implementing hierarchical structures for increased performance. Owing to the highly concentrated nature of MPEAs, the evolution and thermal stability of these microstructures often differ from conventional matrix-precipitate systems, offering new pathways for microstructural control and strength-ductility optimization. BCC MPEAs are particularly compelling due to their high melting points and broad phase stability ranges, which make them attractive base systems for exploring microstructural design at elevated temperatures. This study investigates the dislocation-microstructure interactions in multi-phase BCC MPEAs using in-situ transmission SEM under applied strain. Accompanying 4D-STEM measurements enable quantification of matrix-precipitate misfit strains to determine theoretical strengthening models. The results reveal that multi-phase architectures in BCC alloys can unlock ultrahigh strength while offering critical insights into dislocation mobility for guided alloy design in complex systems.
Proceedings Inclusion? Planned:
Keywords Characterization, High-Entropy Alloys, Mechanical Properties

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Accurate Determination of the Deformation Mechanisms in Refractory Compositionally Complex Alloys
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CALPHAD-Guided Development and Mechanical Evaluation of Dual-Phase CoFeNiVTi Alloys
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