Structure and Properties of Heat-Resistant Alloys NiAl–Cr–Co–X (X = La, Mo, Zr, Ta, Re) and Fabrication of Powders for Additive Manufacturing

The NiAl–Cr–Co–X alloys were produced by centrifugal self-propagating high-temperature synthesis (SHS) casting. The effects of dopants X = La, Mo, Zr, Ta, and Re on combustion, as well as the phase composition, structure, and properties of the resulting cast alloys, have been studied. The greatest i...

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Bibliographic Details
Published in:Materials 2021-06, Vol.14 (12), p.3144
Main Authors: Sanin, Vitaliy V., Kaplansky, Yury Yu, Aheiev, Maksym I., Levashov, Evgeny A., Petrzhik, Mikhail I., Bychkova, Marina Ya, Samokhin, Andrey V., Fadeev, Andrey A., Sanin, Vladimir N.
Format: Article
Language:English
Subjects:
Aging
Alloys
Aluminum
Casting alloys
Centrifugal casting
Chromium
Ductility
Grain boundaries
Heat resistance
Heat resistant alloys
Intermetallic compounds
Manufacturing
Mechanical properties
Metal fatigue
Molybdenum
Nanoindentation
Nickel aluminides
Nickel base alloys
Nickel compounds
Phase composition
Plasma
Review
Rhenium
Self propagating high temperature synthesis
Spheroidizing
Structural hierarchy
Zirconium
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Summary:The NiAl–Cr–Co–X alloys were produced by centrifugal self-propagating high-temperature synthesis (SHS) casting. The effects of dopants X = La, Mo, Zr, Ta, and Re on combustion, as well as the phase composition, structure, and properties of the resulting cast alloys, have been studied. The greatest improvement in overall properties was achieved when the alloys were co-doped with 15% Mo and 1.5% Re. By forming a ductile matrix, molybdenum enhanced strength characteristics up to the values σucs = 1604 ± 80 MPa, σys = 1520 ± 80 MPa, and εpd = 0.79%, while annealing at T = 1250 ℃ and t = 180 min improved strength characteristics to the following level: σucs = 1800 ± 80 MPa, σys = 1670 ± 80 MPa, and εpd = 1.58%. Rhenium modified the structure of the alloy and further improved its properties. The mechanical properties of the NiAl, ZrNi5, Ni0.92Ta0.08, (Al,Ta)Ni3, and Al(Re,Ni)3 phases were determined by nanoindentation. The three-level hierarchical structure of the NiAl–Cr–Co+15%Mo alloy was identified. The optimal plasma treatment regime was identified, and narrow-fraction powders (fraction 8–27 µm) characterized by 95% degree of spheroidization and the content of nanosized fraction
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14123144