Comparison of constituent intermetallic particles in different aluminium alloys

Abstract

This study quantitatively evaluates the variation in the distribution, density, size, and chemical composition of constituent intermetallic particles (IMPs) in different commercial high strength aluminium alloys, including Al-Cu-Mg (AA2024-T3), Al-Cu-Li (AA2198-T8/T851), and Al-Mg-Zn (AA7475-T761) alloys. It is observed that the AA2024-T3 alloy is characterized by three primary types of IMPs (Al-Cu-Mg, Al-Cu-Fe-Mn, and Al-Cu-Fe-Mn-Si) and the highest particle population density. In contrast, the Al-Cu-Li alloys contain a single type of IMP (Al-Cu-Fe), while the AA7475-T761 alloy exhibits the lowest population density of IMPs that are distinguished by varying copper contents.