Abstract
Thermodynamic analysis of oxygen solutions in liquid nickel containing aluminum and titanium was carried out. It is shown that the aluminum and titanium presence in the melt signifi cantly reduces the solubility of oxygen with their content increasing. However, after reaching contents of 0.205 % in the case of aluminum and 0.565 % in the case of titanium the oxygen concentration in the melt begins to increase with aluminum and titanium contents increasing. The minimum oxygen concentration during deoxidation of nickel melt by aluminum (1.44·10–4 % O) and titanium (2.98·10–4 % O) was determined. Obtained results allow to off er the best option of nickel alloys alloying by aluminum and titanium. Initially the deoxidation of melt is produced by aluminum in an amount providing the minimum oxygen concentration in the melt (~ 0,2 % Al). Then the formed oxide phase is removed to prevent the reoxidation of the melt. Only then alloying the melt is made by aluminum and titanium to desire their contents in the alloy.
Highlights
It is shown that the aluminum and titanium presence in the melt significantly reduces the solubility of oxygen with their content increasing
After reaching contents of 0.205 % in the case of aluminum and 0.565 % in the case of titanium the oxygen concentration in the melt begins to increase with aluminum and titanium contents increasing
Obtained results allow to offer the best option of nickel alloys alloying by aluminum and titanium
Summary
ТЕРМОДИНАМИКА РАСТВОРОВ КИСЛОРОДА В РАСПЛАВАХ НИКЕЛЯ, СОДЕРЖАЩИХ АЛЮМИНИЙ И ТИТАН* Леонтьев Л.И.1, 2, 3, академик РАН, советник, д.т.н., профессор, главный научный сотрудник ( lleontev@imet.ac.ru; leo@presidium.ras.ru ) Система Ni –Al. При раскислении никеля алюминием продуктами реакции в зависимости от содержания алюминия в расплаве могут быть оксиды NiO·Al2O3 и Al2O3. Содержащих алюминий и кислород, по данным работы [9] величина параметра может быть использована до содержания алюминия 2 %.
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