Loading…

The Effect of Dopants on Structure Formation and Properties of Cast SHS Alloys Based on Nickel Monoaluminide

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 a...

Full description

Saved in:
Bibliographic Details
Published in:Materials 2023-04, Vol.16 (9), p.3299
Main Authors: Sanin, Vitalii V, Aheiev, Maksym I, Kaplanskii, Yury Yu, Loginov, Pavel A, Bychkova, Marina Ya, Levashov, Evgeny A
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. Al O and Co CrO were the major phases of the oxidized layer. Three layers were formed: I-the continuous Al O layer with Co CrO 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).
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16093299