Structure and Properties of Nb–Si–Al Hypoeutectic Alloys Obtained by Aluminothermy at Different Cooling Ratesстатья
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Дата последнего поиска статьи во внешних источниках: 12 января 2022 г.
Аннотация:The effect of the cooling rate on the structure and properties of hypoeutectic Nb–Si–Al alloys
obtained by aluminothermy in an argon atmosphere studied by scanning electron microscopy, X-ray phase analysis, and energy-dispersive analysis. The indentation method is used to measure the mechanical properties of the obtained alloys: the fracture toughness and hardness. The cooling rate of the alloy is regulated by replacing the crucible material: the cooling rates of the alloy differ by almost an order of magnitude. The difference in the cooling rates does not affect the phase composition of the obtained alloys: in all cases, a solid solution of silicon and aluminum in niobium (Nbss) and β-Nb5Si3 silicide are formed. The microstructures of the obtained alloys are similar, but differ in dispersion. The formation of a finer structure led to an increase
in the mechanical properties of the alloy compared to those of the alloy with a lower degree of structure dispersion.