|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Solidification Processing of Light Metals and Alloys: An MPMD Symposium in Honor of David StJohn
||Predicting Microsegregation and Microstructural Evolution in Advanced High Pressure Die Cast Magnesium Alloys
||Tracy Berman, Zhenjie Yao, Mei Li, John E. Allison
|On-Site Speaker (Planned)
||John E. Allison
High pressure die casting (HPDC) is the primary manufacturing method for magnesium alloy automotive components. However, the extreme cooling rates that occur during high pressure die casting are far from equilibrium and prediction of microstructural evolution requires new approaches. A combined experimental/simulation-based ICME methodology has been developed for predicting microsegregation and microstructural evolution during die casting. The experimental study included EPMA and SEM to characterize microsegregation and microstructural kinetics in a series of Mg-Al binary alloys and a Mg-Al-Zn ternary alloy. High precision MagmaSoft SVDC simulations are coupled with the EPMA segregation profiles to develop a location-dependent HPDC microsegregation model which assumes a solidification front velocity-dependent partition coefficient to account for solute trapping. This approach successfully describes the microsegregation and changes in eutectic phase fraction observed through the casting thickness. Approaches for incorporating this into ICME methods for predicting microstructures and properties in HPDC Mg components will be described.