About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Defects and Interfaces: Modeling and Experiments
|
Presentation Title |
Twin Density and Twin Thickness Evolution in Sputtered Al-Mg Alloy |
Author(s) |
Xuanyu Sheng, Nicholas Richter, Anyu Shang, Haiyan Wang, Xinghang Zhang |
On-Site Speaker (Planned) |
Xuanyu Sheng |
Abstract Scope |
Twinned Al-Mg alloys have been reported. However, the role of Mg solute in facilitating the formation of growth twins remains unclear. By using ASTAR, a crystallographic indexing and orientation mapping tool coupled with transmission electron microscopy, we examined the evolution of twin boundaries in Al, Al-1Mg and Al-2.2Mg (at.%) films. The twinned grain fraction elevates with increasing film thickness until it reaches a peak when the film thickness is 120-160 nm. The Al-Mg alloys exhibited greater twinned grain fractions than pure Al. The initial increase of twin density is attributed to the impingement of twinned grains during island coalescence and the twinned grains are more likely to survive during the grain growth process. Whereas the decrease of twinned grain fraction in thicker films is related to the removal of intragranular twins, and a lack of formation mechanisms of new twins. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Thin Films and Interfaces, |