The Effect of the β-Al5FeSi Phases on Microstructure, Mechanical and Fatigue Properties in A356.0 Cast Alloys with Higher Fe Content without Additional Alloying of Mn

Secondary-cast aluminum alloys have increasing industrial applications. Their biggest deficiency is their impurity content, especially Fe, which has low solubility in Al and almost all the content creates intermetallic phases. This work examines the effect of higher Fe content on the microstructure...

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Bibliographic Details
Published in:Materials 2021-04, Vol.14 (8), p.1943
Main Authors: Kuchariková, Lenka, Medvecká, Denisa, Tillová, Eva, Belan, Juraj, Kritikos, Michaela, Chalupová, Mária, Uhríčik, Milan
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Aluminum base alloys
Casting alloys
Computed tomography
Corrosion resistance
Crack initiation
Die casting
Energy consumption
Fatigue failure
Heat treatment
Industrial applications
Intermetallic phases
Iron
Manganese
Mechanical properties
Metal fatigue
Microstructure
Permanent mold casting
Porosity
Raw materials
Sand casting
Sand molds
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Summary:Secondary-cast aluminum alloys have increasing industrial applications. Their biggest deficiency is their impurity content, especially Fe, which has low solubility in Al and almost all the content creates intermetallic phases. This work examines the effect of higher Fe content on the microstructure and properties of A356.0 alloy. At the same time, no other possibility existed to affecting the brittleness of the formation of the β phases. The calculation of Fecrit, ratio of Mn/Fe, quantitative and computed tomography analysis of porosity and Fe plate-like phases, measurement of mechanical and fatigue properties, and fractography analysis were performed in this study. The results show that gravity die casting into a sand mold, and the non-usage of Mn addition or heat treatment, do not have a negative effect on increasing the size of the Fe-rich plate-like phases. The longest Fe-rich phases have limited the pore growth and ratios, but their higher thickness led to greater porosity formation. The mechanical and fatigue properties correlate with the Fecrit level and the highest were for the experimental alloy with 0.454 wt.% of Fe. The experimental results confirmed the fact that if the Fe plate-like phases have a length of up to 50 µm, the fatigue properties depend more on the size of porosity. If the length of the Fe needles is more than 50 µm, then the properties are mainly affected by the length of these Fe phases.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14081943