| Autor: |
Sanin VV; Scientific-Educational Center of SHS, National University of Science and Technology 'MISiS', Leninsky Prospect 4, 119049 Moscow, Russia., Kaplansky YY; Scientific-Educational Center of SHS, National University of Science and Technology 'MISiS', Leninsky Prospect 4, 119049 Moscow, Russia., Aheiev MI; Scientific-Educational Center of SHS, National University of Science and Technology 'MISiS', Leninsky Prospect 4, 119049 Moscow, Russia., Levashov EA; Scientific-Educational Center of SHS, National University of Science and Technology 'MISiS', Leninsky Prospect 4, 119049 Moscow, Russia., Petrzhik MI; Scientific-Educational Center of SHS, National University of Science and Technology 'MISiS', Leninsky Prospect 4, 119049 Moscow, Russia., Bychkova MY; Scientific-Educational Center of SHS, National University of Science and Technology 'MISiS', Leninsky Prospect 4, 119049 Moscow, Russia., Samokhin AV; A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninsky Prospect 49, 119334 Moscow, Russia., Fadeev AA; Scientific-Educational Center of SHS, National University of Science and Technology 'MISiS', Leninsky Prospect 4, 119049 Moscow, Russia.; A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninsky Prospect 49, 119334 Moscow, Russia., Sanin VN; A.G. Merzhanov Institute of Sructural Macrokinetics and Materials Science, Russian Academy of Science, Acad. Osipyan Str. 8, Chernogolovka, 142432 Moscow, Russia. |
| Abstrakt: |
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 σ ucs = 1604 ± 80 MPa, σ ys = 1520 ± 80 MPa, and ε pd = 0.79%, while annealing at T = 1250 ℃ and t = 180 min improved strength characteristics to the following level: σ ucs = 1800 ± 80 MPa, σ ys = 1670 ± 80 MPa, and ε pd = 1.58%. Rhenium modified the structure of the alloy and further improved its properties. The mechanical properties of the NiAl, ZrNi 5 , Ni 0.92 Ta 0.08 , (Al,Ta)Ni 3 , 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 <5% were obtained. |
