| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Neutron and Synchrotron Diffraction Methods for Unveiling Structural Evolution in Complex and Off-Equilibrium Alloys |
| Author(s) |
Klaus-Dieter Liss, Megumi Kawasaki |
| On-Site Speaker (Planned) |
Klaus-Dieter Liss |
| Abstract Scope |
Neutron and synchrotron microbeam radiation are utilized to investigate and drive materials design in situ at high temperatures or under plastic deformation. High pressure torsion, a severe plastic deformation method, enables the production of materials far from thermodynamic equilibrium, with a high degree of disorder on multiple length scales. Subsequent annealing allows for microstructure tuning through the relaxation of residual stresses, followed by recrystallization. High stored energies result in high concentrations of vacancies, enhancing diffusion and promoting phase and microstructure evolution through accelerated precipitation of secondary metastable and stable phases. Such microstructural design not only modifies mechanical properties but also enhances functional properties of materials. Examples will be presented through various metal systems, including high-entropy alloys and supersaturated single bcc-phase Fe-34Ga, which cannot be produced by conventional means. State-of-the-art in situ methods facilitate comprehensive studies of phase analysis, lattice strain contributions by residual stress, thermal expansion, chemical order, and vacancies. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Phase Transformations, High-Entropy Alloys |