About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Vacancy Engineering in Metals and Alloys
|
| Presentation Title |
Time–temperature superposition for the spall strength of light metals with nonequilibrium vacancy concentrations |
| Author(s) |
Sara Adibi, Justin Wayne Wilkerson |
| On-Site Speaker (Planned) |
Justin Wayne Wilkerson |
| Abstract Scope |
Here, we provide a systematic molecular dynamics (MD) study of the pulse duration and temperature dependence of spall strength in Al and Mg with a nonequilibrium concentration of vacancies. A superconcentration of single vacancies are randomly introduced into an otherwise perfect lattice, and the systems are allowed to evolve for up to 500 nanoseconds as a proxy for the pulse duration of a shock compression wave. Since these systems are nonequilibrium in nature, a time-dependent and temperature-dependent evolution of the microstructure ensues, which leads to a time- and temperature-dependent softening of the spall strength. We invoke the notion of time–temperature superposition from the field of viscoelasticity, and show that the results of our MD calculations collapse onto a single master curve when normalized by an appropriate relaxation timescale. Lastly, a favorable agreement between the MD calculations and experimental measurements of thermal softening of spall strength is reported. |
| Proceedings Inclusion? |
Planned: |