EFFECTS OF GERMANIUM (GE) ON HARDNESS AND MICROSTRUCTURE OF AL-MG, AL-CU, AL-MN SYSTEM ALLOYS

This article presents researches conducted on samples obtained by micro alloying aluminum alloys with germanium oxide.Experiments were carried out on aluminum-magnesium, aluminum-copper and aluminum-manganese aluminum alloys, and the hardness and microstructure of the samples obtained by casting were studied.The samples were melted in the open air in a resistance furnace and poured into sand-clay molds.Germanium oxide was added to the charge in a rolled state using a special aluminum coating.Depending on the weight of the charge and the oxide's germanium concentration, between 0.1 and 0.3 percent of germanium oxide was added to aluminum alloys.An optical metallographic microscope was used for microscopic analysis of cast samples.Studies have shown that the germanium addition significantly destroys the microstructure of an aluminum alloy with intermetallic granules.Moreover, the hardness of the researched samples was studied.The authors outlined their recommendations and conclusions at the end of the article.

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