Effect of Addition Zr on As-Homogenization Microstructures of 5182 Aluminum Alloy

Abstract:

The microstructure of 5182 alloys, standard and modified by Zr, before/after homogenizing heat treatment were investigated by optical microscope (OM), scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS) and transmission electron microscope (TEM). The microstructures on optimum condition for homogenizing heat treatment and the effect of Zr were discussed. It is found that the intermetallic compounds formed on the grain boundaries are less in Zr modified 5182 than 5182 alloys for the as-cast structure. After the two alloys homogenized at 475 for 24h, the dendritic structure disappear and intermetallic compounds become discontinuous, Al₂Mg₃ phases are decomposed, and there are some precipitates of Al₆(Mn,Fe) and Al₆Mn in the grain interior. In addition, precipitates of Al₃Zr distributed in the matrix of Zr modified 5182 alloys.

• Periodical: Materials Science Forum (Volume 749)
• Pages: 47-53
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.749.47
• Online since: March 2013
• Authors: Bin Hui Jin, Bao Hong Zhu, Xi Wu Li
• Keywords: Dendritic Structure, Homogenization, Microstructure, Zr Modified 5182

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