|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||The Combined Effects of Sr Additions and Heat Treatment on the Microstructure and Mechanical Properties of High Pressure Die Cast A383 Alloy
||Tao Liu, Sydney Morales, Luke Brewer, Mikko Karkkainen, Nastac Laurentiu, Arvikar Vish, Levin Ilya
|On-Site Speaker (Planned)
The combined effects of heat treatment and strontium additions on the microstructure and mechanical properties of high pressure die cast (HPDC) A383 alloy components were investigated. A series of HPDC engine components were produced using combined Sr additions and heat treatments. The resulting micro- and nanostructures were characterized using optical and electron microscopy. The results showed that Sr additions increased the elongation, but not the strength, of as-cast A383 alloys due to the refinement of the Al-Si eutectic. Heat treatment combined with Sr addition improved the strength because of the formation of a high density of fine nano-precipitates . The results suggest that the formation of these precipitates may be affected by the Sr additions. This same combination also improved the ductility by maintaining the small size and roundness of Al-Si eutectic particles. The amount and size of Fe-rich intermetallics did not change with either Sr additions or heat treatment.
||Planned: Light Metals