Grain Size, secondary phase (beta-Mg12Al12) volume fraction, and microsegregation was investigated as a function of aluminum content and through-thickness location in high pressure die cast (HPDC) Mg-Al and Mg-Al-Mn alloys. The experimental data was used to provide an empirical model for grain size and to calibrate a model used to predict the solidification front velocity dependent partition coefficients (which were found to deviate from the equilibrium partition coefficient near the surface the the plate where the cooling rate is higher). The model, in addition to an understanding of the distribution of externally solidified crystals throughout the HPDC component, can be used to predict the phase fractions and local microsegregation in Mg-Al alloys.

This work explores three different "regions of interest" *edge is defined as the region less than 50 µm from the plate casting surface, EPMA scans were taken parallel to this surface, approximately 10 µm from the surface *near edge is defined as the region 100 to 300 µm from the plate casting surface *center is the region at least 500 µm from the casting surface, EPMA scans were taken near mid-thickness

The following scripts have been provided: *EPMA_Analysis.nb was used to construct the microsegregation profiles using the weighted interval rank and sort (WIRS) technique *Forward_Model_final.nb was used to run the EPMA forward model simulation and calculate the least squares difference between the experimental microsegregation profiles and the simulated results *kv_solver_final.nb is used to predict the local velocity dependent partition coefficient given the alloy content, cooling rate, and local concentration of externally solidified crystals *PhaseSeparationAlgorithm_Final.m was used to calculate the fraction of secondary phases from SEM images

The native language the .nb extension is Mathematica. The native language for the .m extension is Matlab. If a txt file of these scripts would be useful for you (so that it can be modified to work with a different platform), please feel free to contact the corresponding author.

Please feel free to contact the corresponding author with any questions or to ask for clarification: Dr. Tracy Berman email: tradiasa@umich.edu