| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2025
|
| Presentation Title |
Impact of excess vacancies on solute clustering and precipitation in magnesium alloys |
| Author(s) |
Sreenivas Raguraman, Zehao Li, Homero Reyes Pulido, Michael Falk, Arun Devaraj, Timothy Weihs |
| On-Site Speaker (Planned) |
Sreenivas Raguraman |
| Abstract Scope |
Defects within materials, particularly vacancies, play a crucial role in influencing the behavior of metals and alloys across various manufacturing and service conditions. Elevated vacancy concentrations from rapid solidification or plastic deformation can accelerate solute clustering, precipitation kinetics, and mechanical properties through vacancy-induced diffusion. However, their ability to thermodynamically enhance clustering and precipitation has received less attention. This investigation aims to understand the thermodynamics of vacancy-solute complexes, solute clustering near vacancy clusters, and ultimately void and precipitate nucleation in binary Mg alloys (Mg-Zn, Mg-Y, Mg-Al). Excess vacancies are initially induced by cryo-quenching from solutionizing temperatures, followed by artificial aging at 150°C to form vacancy and solute clusters. The resulting microstructures and properties are characterized using XRD, hardness, SEM, Positron Annihilation Spectroscopy, and Atom Probe Tomography. This experimental approach is coupled with simulations using transition interface sampling, integrating Molecular Dynamics and Monte Carlo simulations to further understand the impact of vacancies. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Characterization, Mechanical Properties |