|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||The Effects of Solutes on the Tensile Strength of Nano-twinned Ag Thin Films at Various Temperatures
||Jie Geng, M. F. Besser, F. Q. Meng, R. T. Ott
|On-Site Speaker (Planned)
Although metals with nano-twinned structure, i.e., densely spaced growth twins, exhibit excellent strength at room temperature, the materials exhibit significant softening at elevated temperatures. Alloying is a potentially promising way to stabilize nanotwins by modifying the microstructures, such as grain size, twin spacing and twin boundaries. In this study, thin films of pure Ag, Ag-Cu and Ag-Al with nano-scale growth twins have been synthesized by magnetron sputtering onto a (100) Si substrate. The free-standing films were tensile tested at different temperatures from 25 to 400°C. The results revealed that the addition of 0.3 at.% Cu stabilizes the tensile strength at 200°C compared to the pure Ag and Ag-Al thin films which softened significantly at 200°C. In-situ synchrotron X-ray diffractions have also been conducted during tensile loading at 25-250°C to investigate the dislocation activities in the nano-twinned thin films.
||Planned: Supplemental Proceedings volume