X. M. Pan, J. E. Morral, H. D. Brody, The Ohio State University, Columbus, OH; C. Lin, University of Connecticut, Storrs, CT
In order to predict the solidification microstructure and heat treatment response of aluminum alloy 519, a thermodynamic assessment of the Al-Si-Cu ternary system was developed by fitting thermodynamic and phase diagram information available from the literature. A comparison between calculated phase boundaries and experimental data show that in the Al-rich corner of the ternary system the calculations fall within the scatter of experimental data. Furthermore, the Al-Si-Cu database was used to extrapolate into the Al-Si-Cu-Mg quaternary system. The databases were then used to predict the solidification behavior of both an Al-7wt.%Si-3.5wt.%Cu alloy and an Al-7wt.%Si-3.5wt.%Cu-0.5wt.%Mg. These predictions were validated by comparisons with experimental measurements made on cast alloys .
Summary: In order to predict the solidification microstructure and heat treatment response of aluminum alloy 519, a thermodynamic assessment of the Al-Si-Cu ternary system was developed by fitting thermodynamic and phase diagram information available from the litera. The databases were used to predict the solidification behavior of both an Al-7wt.%Si-3.5wt.%Cu alloy and an Al-7wt.%Si-3.5wt.%Cu-0.5wt.%Mg. These predictions were validated by comparisons with experimental measurements made on cast alloys ture.
