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
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.
Materials (Basel). 2021 Jun 8;14(12):3144. doi: 10.3390/ma14123144.
The NiAl-Cr-Co- alloys were produced by centrifugal self-propagating high-temperature synthesis (SHS) casting. The effects of dopants = 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 = 1604 ± 80 MPa, σ = 1520 ± 80 MPa, and ε = 0.79%, while annealing at T = 1250 ℃ and t = 180 min improved strength characteristics to the following level: σ = 1800 ± 80 MPa, σ = 1670 ± 80 MPa, and ε = 1.58%. Rhenium modified the structure of the alloy and further improved its properties. The mechanical properties of the NiAl, ZrNi, NiTa, (Al,Ta)Ni, and Al(Re,Ni) 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.
通过离心自蔓延高温合成（SHS）铸造法制备了NiAl-Cr-Co合金。研究了掺杂剂（La、Mo、Zr、Ta和Re）对燃烧的影响，以及所得铸造合金的相组成、结构和性能。当合金同时掺杂15%的Mo和1.5%的Re时，综合性能得到了最大程度的改善。通过形成韧性基体，钼将强度特性提高到σ = 1604 ± 80 MPa、σ = 1520 ± 80 MPa和ε = 0.79%，而在T = 1250℃和t = 180 min下退火后，强度特性提高到以下水平：σ = 1800 ± 80 MPa、σ = 1670 ± 80 MPa和ε = 1.58%。铼改变了合金的结构并进一步改善了其性能。通过纳米压痕法测定了NiAl、ZrNi、NiTa、(Al,Ta)Ni和Al(Re,Ni)相的力学性能。确定了NiAl-Cr-Co+15%Mo合金的三级层次结构。确定了最佳的等离子体处理工艺，并获得了球化度为95%且纳米级分数含量<5%的窄粒度粉末（粒度为8-27 µm）。
