The effect of iron impurity on the structure and properties of aluminum alloy AL9M, especially its action on magnesium distribution within the structure, is studied. The microstructure of a cast component of this alloy broken during operation is analyzed. It is shown that iron impurity has an unfavorable effect on structure and mechanical properties of a casting due to appearance of Al9Fe2Si and Al18Fe2Mg7Si10 intermetallics. Formation of these intermetallics consumes a considerable amount of magnesium and lowers the content of the Q(Al5Cu2Mg8Si6) strengthening phase in the alloy structure.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 22 – 27, June, 2017.
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Bazhenov, V.E., Koltygin, A.V. & Belov, V.D. Effect of Iron and Magnesium on Alloy AL9M Structure and Properties. Met Sci Heat Treat 59, 346–351 (2017). https://doi.org/10.1007/s11041-017-0154-5
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DOI: https://doi.org/10.1007/s11041-017-0154-5