Harnessing solid-state transformation pathways in complex alloys
Abstract
University of Michigan propose a focused experimental approach that will initiate the development of a framework for understanding specific solid-state phase transformations in multi-principal element alloys (MPEAs). Significant interest has recently been drawn to the study and development of MPEAs and so-called high entropy alloys (HEAs), however, it has remained largely limited to single-phase solid solutions. University of Michigan contend that the full extent of metastability beyond stabilizing single-phase solid solutions has not been fully recognized and therefore used. We hypothesize that MPEAs yield unique metastable microstructures that cannot be achieved in simpler, conventional alloys. Specifically, we contend that the less common solid-state decomposition pathways involving moving boundaries offer the most promise in terms of microstructure and property discovery. Indeed, the possibility of tailoring phase metastability and interface properties during phase decomposition creates opportunities for new microstructures. Within this limited three-year program, we specifically propose to elucidate the detailed mechanisms of solid-state phase decomposition via moving boundaries in a few selected alloy compositions to clarify the mechanisms behind initiation and propagation, phase selection and in particular the formation of metastable phases, and the topology of the final microstructures. This work will rely on multi-scale and multi-modal characterization of microstructures during aging. Furthermore, we will verify that the developed microstructures are thermally stable, despite the high density of interfaces, and exhibit promising mechanical properties. Given the relevance of MPEAs across all material classes, the proposed work will serve as a starting point to subsequent experimental and modeling efforts focused on expanding the findings of this work to a broader range of alloys and materials.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2025
- Source ID
- FA95502410091
Entities
People
- Emmanuelle A. Marquis
Organizations
- Air Force Office of Scientific Research
- Board of Regents of the University of Michigan
- United States Air Force