Abstract
Some causes of the formation of refractory phases during making of an Al-Nb-Si master alloy are considered. Chemical analysis, X-ray diffraction, and electron-probe microanalysis of master alloy ingots melted by aluminothermic and aluminocalciumthermic methods demonstrate that partial (up to 5%) substitution of calcium for aluminum in a charge does not degrade the quality of the master alloy. It is experimentally shown that the interaction of NbAl3 and Nb2Al with niobium pentoxide leads to the formation of elemental niobium. The presence of materials containing niobium aluminides in a charge can affect the perfection of the master alloy.
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