Effect of high-temperature annealing on structure and properties of Ni3Al intermetallic compound in alloys

The article demonstrates advantages of the Ni3Al intermetallic compound in alloys over the heat-resisting nickel superalloys. The authors analyze both annealing features and application areas of the state-of-the-art VKNA-1B and VKNA-4U monocrystal alloys. The article also discusses the main technological operations conducted during the process of manufacturing some items from these alloys, which involve heating up to 1000...1200 °С. The authors carry out metallographic and X-ray structure analysis studying the effect of high-temperature annealing on the structural and phase state of the alloys. The analysis shows that annealing within the temperature range of 1000...1150 °С leads to formation of disperse Ni₃Al particles and increases the crystal lattice mismatch of γ- and γ'-phases which has considerable impact on the long-term strength of the alloys. The authors perform the comparative analysis of the changes occurred in both the structure and properties of the alloys under consideration.

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