Study on the primary Al3Sc phase and the structure heredity of Al-Zn-Mg-Cu-Sc-Zr alloy.

The morphology of primary Al 3 Sc phase in Al-2.2Sc(wt%) was found to be influenced by melting condition. Some representative morphology appeared in large quantities at specific melting temperatures, holding times, and cooling rates. Crystallography of primary phases with various morphologies was researched, and the growth processes of the primary phase were investigated. Deformed cubes and dendrite can be developed from cubes, the butterfly-like particles had multiple layers inside, and repeated eutectic reactions were the main reason for the formation of multilayer structures. Al-2.2Sc(wt%) master alloys with different morphologies of primary Al 3 Sc phase can lead to different refining effects, and the mechanical properties of alloys were consequently influenced. The structure heredity of Al Sc master alloy was proved to be existed, and not influenced by prolonging insulation time and sufficient stirring. Unlabelled Image [ABSTRACT FROM AUTHOR]