About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Neutron Scattering for Engineering Materials
|
| Presentation Title |
Extinction-based diffraction analysis of phase transformation and recovery in β-Zr and β-Ti alloys |
| Author(s) |
Klaus-Dieter Liss, Saurabh Kabra |
| On-Site Speaker (Planned) |
Klaus-Dieter Liss |
| Abstract Scope |
The β phases of zirconium and titanium exhibit abnormally high diffusivity due to open lattice structures and phonon softening, accelerating defect kinetics. Recovery processes lead to near-perfect crystallites, where primary extinction — described by the dynamical theory of diffraction — becomes significant. The temporal decline in diffraction intensity across reflections reveals crystal perfection and recovery upon heating. Brief plastic deformation reduces extinction, followed by secondary recovery. Upon cooling, α-phase nucleation expels strain into β-phase crystallites, sensitively detected by reduced extinction, even below the detection threshold of the precipitate. This enables quantification of nucleation times, saturation of nucleation sites, and subsequent two-dimensional lamellar growth within β grains. Extinction-based analysis has been applied to Zr and Ti alloys and is broadly relevant to transformation processes in other metals, including those encountered during additive manufacturing. The approach provides a powerful tool to detect subtle structural transitions and kinetics, otherwise inaccessible by conventional methods. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Titanium, Phase Transformations |