Techniques and Methods of Changing Morphology of Iron Contaning Phases in Silumines
Processy litʹâ, 2020, Tom 139, №1, p.30-41
DOI:
https://doi.org/10.15407/plit2020.01.030Keywords:
Al−Si−Fe, Al−Si−Cu−Fe, iron in aluminum alloys, modification, physical modification of the meltAbstract
Received 20.12.2019
UDK 669.715
Aluminum alloys remain one of the most used materials at present. An important technological advantage of this materials is the simplicity and feasibility of their recycling and reuse. However, during the processing of aluminum alloys they are saturated with impurities that adversely affect the structural-phase characteristics and mechanical properties of cast products. Iron is a particularly harmful impurity. Iron content increases with each processing cycle. At a certain concentration (~ 1% wt.), iron can be useful due to the reduction of burnout in steel molds during die casting injection molding. In other cases, the role of iron is negative. Due to its zero solubility, almost all the iron in aluminum forms intermetallic phases of various compositions (Al3Fe, Al5Fe2, Al8Fe2Si, Al5FeSi, Al4FeSi2, Al3FeSi etc.), which cannot be removed from the melt. The iron-containing phases have a generally unfavorable morphology, especially in alloys containing silicon. They are the cause of mechanical and technological properties decrease. Lowering iron content in Al-alloys is possible only due to dilution of the melt with pure components, but modification is the most appropriate solution to reduce its negative impact.This paper considers and overviews a number of modifiers and processing technologies for aluminum melts. The features of Mn, Ni, Cr, Co, V, La, and other elements addition effects in Al-Si alloys of various compositions were analyzed, as well as the
influence of some technologies for the physical modification and processing of aluminum melts. The article analyzes the problematic issues associated with the effectiveness of various modifiers and modifying methods to neutralize the negative effect of iron on the properties of Al−Si alloys by changing the morphology of iron-containing phases and improving the properties of alloys.
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