Mechanical properties of NiAl-Y2O3-based powdered alloys produced by directional recrystallization |
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Authors: | K. B. Povarova O. A. Skachkov A. A. Drozdov A. E. Morozov S. I. Pozharov |
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Affiliation: | 1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia 2. Bardin Central Research Institute for Iron and Steel Industry, Moscow, Russia
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Abstract: | The mechanical properties of NiAl-Y2O3-based powdered composite alloys (0.5–7.5 vol %), including those with an NiAl intermetallic matrix alloyed with 0.5 wt % Fe and 0.1 wt % La have been studied. Structures with various aspect ratios (AR, the ratio of the grain length to the grain diameter) are formed using deformation and subsequent annealing. A combination of the optimum amount of strengthening phase (2.5 vol % Y2O3) and a quasi-single-crystalline structure with a sharp axial texture with the (100) main orientation and AR ≈ 20–40 provides the maximum short-term strength and life at temperatures up to 1400–1500°C. An NiAl-Y2O3 alloy (2.5 vol %) has the best strength properties among all known nickel superalloys at temperatures higher than 1200°C and can operate under moderate loads at temperatures higher than the working temperatures of nickel superalloys (by 100–400°C) and their melting points. Additional alloying with 10 wt % Co and 2 wt % Nb makes it possible to increase the ultimate tensile strength of an intermetallic NiAl matrix at 1100°C by a factor of 1.3–1.4. |
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