| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Influence of Plastic Deformation on the Disorder → Order Transformation in 18 Carat Red Gold Alloys Studied by In-situ High-energy X-ray Diffraction |
| Author(s) |
Marina Garcia Gonzales, Steven Van Petegem, Nadine Baluc, Fanny Lalire, Helena Van Swygenhoven |
| On-Site Speaker (Planned) |
Steven Van Petegem |
| Abstract Scope |
18 carat red gold is an age-hardenable alloy that hardens via chemical ordering. Above a critical temperature the alloy exhibits a chemically disordered microstructure. Below this temperature, chemical ordering takes place, resulting in the formation of harder ordered Au50Cu50 nano-precipitates. This causes distortions in both the disordered matrix and nanoprecipitates, resulting in strong misfit strains. This, in turn, significantly affects the mechanical properties. In this work, we study the influence of plastic deformation and thermal history on the ordering kinetics. Therefore, we have performed in situ high-energy X-ray diffraction experiments during controlled cooling from the high-temperature phase to room temperature, followed by various thermal treatments. The experiments are performed on samples with and without prior plastic deformation, and complemented by post-mortem microscopy observations. We find that dislocations induced by plastic deformation significantly enhance ordering at the early stages of transformation. These findings serve as input for improving thermo-mechanical processing routes. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |