Quantitative metallographic assessment of the electromagnetic casting influence on the microstructure of 7075 Al alloy |
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Authors: | Aleksandra Patari? Marija Mihailovi? Zvonko Guli?ija |
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Affiliation: | (1) Institute for Technology of Nuclear and Other Mineral Raw Materials, Franchet d’Esperey, 11000 Belgrade, Serbia |
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Abstract: | This study presents an attempt to obtain the better quality of an aluminum super-high strength alloy by application of electromagnetic
field during the casting process. The conventional continuous casting process of aluminum alloys causes many defects, such
as surface imperfections, grain boundary segregation, non-uniform grain size, and porosity. The better ingot surface along
with the homogeneous fine-grained microstructure, and hence the better mechanical properties of the ingot, can be achieved
by applying the electromagnetic casting process. The microstructure characterization, accompanied by quantitative metallographic
assessment, reveals that it is possible to avoid or decrease many defects of as cast ingots during electromagnetic casting
process. In this article, the microstructure of the samples of as cast 7075 aluminum alloy, obtained with and without electromagnetic
field influence, was analyzed by optical microscope and the variation of key alloying elements content, i.e., Zn and Mg, through
the ingot cross section was examined by chemical analysis. Besides, the microstructural parameters such as dendrite arm spacing,
interdendritic space width, as well as eutecticum and intermetallic phases volume fraction, were measured using linear method.
The electromagnetic field influence on the microstructure of the as cast 7075 Al alloy was evaluated based on measured quantitative
metallographic data. |
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