|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals
||Effect of Solidification Conditions on the Formation of Sludge in High Pressure Die Casting of Aluminum Alloy AA383
||Tao Liu, Laurentiu Nastac, Luke Brewer, Vishweshwar Arvikar, Ilya Levin
|On-Site Speaker (Planned)
This presentation will examine the effects of solidification conditions (thermal gradient and cooling rate) on the formation of sludge phases (Fe-rich intermetallics) in a modified AA383 Al-Si-Cu alloy. The sludge constituent plays an important role in the mechanical properties of high pressure die cast components. Modified AA383 castings were created using a 3200T Buhler high pressure die cast machine. Samples with different cooling rates were selected from various regions of a much larger casting. The amount and type of sludge defects were determined by optical, SEM and TEM methods. Initial results suggest that higher cooling rates produced microstructures with finer feature sizes and a smaller fraction of sludge. These results are combined with microscopic analyses of modifiers, such as Sr, on the formation of sludge. In addition, thermal analysis experiments are being performed to characterize the sludge formation process and the impact of cooling rate on this process.
||Planned: Supplemental Proceedings volume