Sanin Vitalii V, Aheiev Maksym I, Kaplanskii Yury Yu, Loginov Pavel A, Bychkova Marina Ya, Levashov Evgeny A
Scientific-Educational Center of SHS, National University of Science and Technology "MISIS", Leninsky Prospect 4, Bldg. 1, Moscow 119049, Russia.
Materials (Basel). 2023 Apr 22;16(9):3299. doi: 10.3390/ma16093299.
Alloys based on NiAl-Cr-Co () with complex dopants () were fabricated by centrifugal SHS metallurgy. The phase and impurity compositions, structure, mechanical properties, and the mechanism of high-temperature oxidation at T = 1150 °C were studied; the kinetic oxidation curves, fitting equations and parabolic rate constant were plotted. AlO and CoCrO were the major phases of the oxidized layer. Three layers were formed: I-the continuous AlO layer with CoCrO inclusions; II-the transitional MeN-Me layer with AlN inclusions; and III-the metal layer with AlN inclusions. The positive effect of thermo-vacuum treatment (TVT) on high-temperature oxidation resistance of the alloy was observed. The total weight gain by the samples after oxidative annealing decreased threefold (from 120 ± 5 g/m to 40 ± 5 g/m). The phases containing Ru and Ti microdopants, which reduced the content of dissolved nitrogen and oxygen in the intermetallic phase to the values ∑ = 0.0145 wt.% for the alloy and ∑ = 0.0223 wt.% for the alloy, were identified by transmission electron microscopy (TEM). In addition, with the significant high-temperature oxidation resistance, the latter alloy with Ti had the optimal combination of mechanical properties (σ = 1644 ± 30 MPa; σ = 1518 ± 25 MPa).
采用离心自蔓延高温合成冶金法制备了含复合掺杂剂（）的NiAl-Cr-Co基合金。研究了其相组成、杂质成分、结构、力学性能以及在T = 1150 °C下的高温氧化机理；绘制了氧化动力学曲线、拟合方程和抛物线速率常数。AlO和CoCrO是氧化层的主要相。形成了三层：I - 含有CoCrO夹杂物的连续AlO层；II - 含有AlN夹杂物的过渡MeN-Me层；III - 含有AlN夹杂物的金属层。观察到热真空处理（TVT）对合金高温抗氧化性有积极影响。氧化退火后样品的总增重降低了三倍（从120±5 g/m降至40±5 g/m）。通过透射电子显微镜（TEM）鉴定了含Ru和Ti微掺杂剂的相，这些相将金属间相中的溶解氮和氧含量降低到：对于合金，∑ = 0.0145 wt.%；对于合金，∑ = 0.0223 wt.%。此外，后一种含Ti合金具有显著的高温抗氧化性，其力学性能达到最佳组合（σ = 1644±30 MPa；σ = 1518±25 MPa）。
