Conclusions
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1.
The inhomogeneity of the β-solid solution in Al-Si alloys is related to nonuniform distribution of aluminum and oxygen in the volume of the crystals.
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2.
Alloying with sodium and strontium leads to redistribution of aluminum and oxygen in the crystals of the silicon-base β-solid solution.
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3.
The change in the forms of growth and micromorphology of the crystals of primary and eutectic silicon in the Al-Si alloys is related to the formation of an inhomogeneous β-solid solution.
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Additional information
Dnepr Scientific Center, Academy of Sciences of the Ukrainian SSR. Dnepropetrovsk Metallurgical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 33–37, September, 1988.