|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Solidification Processing of Light Metals and Alloys: An MPMD Symposium in Honor of David StJohn
||Effects of Si Macrosegregation of the Constitutive Behviour of A356
||Hatef Khadivinassab, Daan M. Maijer, Steve Cockcroft
|On-Site Speaker (Planned)
||Daan M. Maijer
The Al-Si foundry alloy, A356, is one of the most widely used alloys for light-weight structural components. During Prof. StJohn’s career, our knowledge of its aging behavior, response to eutectic modification, and formation of porosity have advanced tremendously. One issue that has not been considered extensively is the effect of macrosegregation in A356 on its mechanical properties. This study investigates the influence of silicon content and microstructural variations on the mechanical properties of aluminum alloy A356 in the as-cast and heat-treated conditions. Tensile testing was performed on specimens extracted from plates cast with different silicon contents. The results have been used to establish an empirical expression correlating DAS, silicon content and heat treated state with flow stress based on a modified Hollomon equation. This expression, combined with a numerical model predicting macrosegregation and solidified microstructure, provides an essential tool to predict the mechanical properties throughout a geometrically complex component.