Dissolution of Cu-Sc Master Alloy in Liquid Al-Zr Alloy

Dissolution behaviors of Cu-20wt%Sc master alloy in liquid Al-0.12wt%Zr alloy was studied in this paper. It is found that both size and areal fraction of particles bearing Sc and Al3Zr particles decrease, the solubility of Sc, Cu and Zr in a-Al increases with the increase in holding time and temperature. Part of Sc atoms is adsorbed on the surface of Al3Zr particles so that Al3Zr particles rich in Sc on surface are formed. The microstructure of the alloy with Sc and Zr after solidification is fine observably. Average grain size of the alloy increases slightly with the increase in holding time and temperature. Fine microstructure of the alloy with Zr and Sc is resulted from the a lot of stable nuclei of Al-3(Sc,Zr) particles rich in Sc on surface. Same as adding Al-Sc-Zr master alloy, Al-3(Sc,Zr) precipitates in the Al-Zr alloy added by Cu-Sc master alloy after homogenization.

Automated summary

The dissolution behaviors of Cu-20wt%Sc master alloy in liquid Al-0.12wt%Zr alloy were studied, showing changes in particle size, areal fraction, solubility, and microstructure with different holding times and temperatures.