| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification Science VIII
|
| Presentation Title |
Crystal-orientation Maps of Lamellar Eutectic Growth Microstructures in Thin Al-Al2Cu Films Obtained by Laue Microdiffraction |
| Author(s) |
Mehdi Medjkoune, Silvčre Akamatsu, Geoffroy Prévot, Jean-Sébastien Micha, Sabine Bottin-Rousseau |
| On-Site Speaker (Planned) |
Mehdi Medjkoune |
| Abstract Scope |
We present the first Laue microdiffraction study of crystal orientation relationships (ORs) in lamellar microstructures obtained by directional solidification in thin Al-Al2Cu samples. We focus on the “lamellar-locking” phenomenon, which is linked to the presence of deep minima of the free energy of the interphase boundary when it aligns with a coincidence plane. In order to establish a precise link between that anisotropy, the OR, and the inclination of the lamellae, local crystallographic analysis is essential. We performed Laue microdiffraction at the ESRF synchrotron (BM32 facility). This provides a non-destructive and spatially resolved technique using a 0.5µm polychromatic x-ray micro-beam. The measurements deliver two-dimensional scans of selected areas (typically 100X100 µm2) of the metallic film. We will give useful details on the analysis of Laue microdiffraction patterns. We discovered that the emerging ORs depend on the alloy concentration. We initiate a discussion on the mosaicity of the composite films. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Characterization, Other |