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

Authors: Bazyleva O.A., Arginbaeva E.G., Unchikova M.V., Kostenko Yu.V. Published: 14.02.2016
Published in issue: #1(106)/2016  

DOI: 10.18698/0236-3941-2016-1-112-122

Category: Metallurgy and Science of Materials | Chapter: Metal Science, Thermal Processing of Metals and Alloys  
Keywords: intermetallic compound Ni3Al, high-temperature annealing, long-term strength

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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