About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Cast Shop Technology
|
Presentation Title |
A Comparison of AA6060 Grain Structures Achieved Using AMG’s TiBAl Advance™ and Alternative Al-Ti-B Grain Refiners via a 1D Upward Solidification Device |
Author(s) |
Matthew Piper, Shahid Akhtar, Phil Enright |
On-Site Speaker (Planned) |
Matthew Piper |
Abstract Scope |
Using a 1D upward solidification device with indirect to direct chill transition, the as-cast grain structures of an AA6060 alloy were evaluated for different Al-Ti-B grain refiner types and addition rates. Through consideration of the individual and combined effects of heterogeneous nucleation and grain growth restriction, a method is provided to reduce the grain refiner addition rate by at least 50 %, whilst maintaining the desired grain structure. Scanning electron microscopy (SEM) characterisation was carried out on the microstructures of each grain refiner, and the size distributions of TiB2 particles were compared. The grain refining efficiency of AMG’s TiBAl Advance is demonstrated to surpass that of other grain refiners tested. TiBAl Advance is suggested to introduce a greater number density of nucleation sites on which free growth of α – Al could be expected to prevail. However, supplementary work is necessary to explain the exact mechanism. |
Proceedings Inclusion? |
Planned: Light Metals |