High-Temperature β-NiAl + γ'-Ni 3 Al + γ-Ni Alloys of the Ni–Al–Co System

K. B. Povarova; O. A. Bazyleva; A. A. Drozdov; A. E. Morozov; A. V. Antonova; V. P. Sirotinkin; M. A. Bulakhtina; E. G. Arginbaeva; N. A. Alad’ev

doi:10.1134/S0036029519110089

High-Temperature β-NiAl + γ'-Ni₃Al + γ-Ni Alloys of the Ni–Al–Co System

Authors: Povarova K.B.¹, Bazyleva O.A.², Drozdov A.A.¹^,3, Morozov A.E.¹, Antonova A.V.¹, Sirotinkin V.P.¹, Bulakhtina M.A.¹, Arginbaeva E.G.², Alad’ev N.A.¹
Affiliations:
1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences
2. All-Russia Research Institute of Aviation Materials
3. Bardin Central Research Institute for Ferrous Metallurgy
Issue: Vol 2019, No 11 (2019)
Pages: 1167-1177
Section: Article
URL: https://journals.rcsi.science/0036-0295/article/view/173676
DOI: https://doi.org/10.1134/S0036029519110089
ID: 173676

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Abstract

The oxidation resistance of cast β-NiAl + γ'-Ni₃Al + γ-Ni alloys of the Ni–Al–Co system in air at 1100, 1200, and 1300°C for 100 h is studied. An increase in the cobalt content from ≤5 at % (in complexly alloyed high-temperature γ' + γ VKNA alloys with ~17 at % Al and Cr, Mo, and W) to 10 at % in chromium-free β + γ' + γ alloys with 26–29 at % Al and 0.26 at % Ta, Re, Hf, and Y is shown to increase the heat resistance due to an increase in the aluminum content, an increase in the plasticity of scale, and the prevention of its exfoliation. The oxidation resistance of the base alloy decreases because of an increase in the cobalt content in the base NIAL-1 alloy from 10 to 16 at % and the introduction of 4.25 at % Cr and 0.16 at % Y of Hf. Its oxidation resistance at 1300°C, which was estimated from the weight increment per unit surface in 100 h corresponds to that of the well-known VKNA/VIN γ' + γ alloys at 1100°C. The oxidation resistance of the alloys with 16 at % Co or 4.25 at % Cr at 1100 and 1200°C is at the level of the VKNA/VIN alloys at 1000°C. The new β + γ' + γ alloys, which have higher oxidation resistance than structural high-temperature γ' + γ alloys and lower high-temperature strength, can be considered as heat- and oxidation-resistant coating-free alloys for short-term operation at 1100°C.

Keywords

nickel aluminides, solidification, oxidation, oxide, structure, heat resistance, properties

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High-Temperature β-NiAl + γ'-Ni3Al + γ-Ni Alloys of the Ni–Al–Co System

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High-Temperature β-NiAl + γ'-Ni₃Al + γ-Ni Alloys of the Ni–Al–Co System