Abstract
In this paper it was shown that pulsed electron irradiation forms in the surface layer of the Ni3Al intermetallic compound samples a columnar crystal structure oriented perpendicular to the irradiated surface. The dimensions of the crystals of the columnar structure and the depth of the surface layer modification depend on the power density and the duration of the irradiation pulses - with power density increasing, the dispersion of the columnar structure increases, with increasing duration of irradiation pulses, the depth of the surface layer structure modification increases. Modification of the surface layer structure improves the strength properties of Ni3Al intermetallic compound samples.
Highlights
The current state of research in the field of structural-phase states modification of intermetallic alloys can be estimated by the example of creating and improving the most highly loaded parts of gas turbine engines - blades of heat-resistant alloys [1,2,3,4]
The increase in the irradiation power density associated with a decrease in the irradiation pulses duration multiply reduces the depth of modification of the surface layer structure
Pulsed electron irradiation drastically modifies the structure of the Ni3Al intermetallic compound samples surface layer - a directionally crystallized structure in the form of columnar intermetallic grains oriented perpendicular to the irradiation surface is formed in the surface layer
Summary
The current state of research in the field of structural-phase states modification of intermetallic alloys can be estimated by the example of creating and improving the most highly loaded parts of gas turbine engines - blades of heat-resistant alloys [1,2,3,4]. Since the 80s of the last century, intensive research has been launched to develop and create high-performance protective coatings from high-temperature gas corrosion and from the formation of thermo-fatigue defects in the form of micro- and macro-cracks in the surface layers, leading to the formation of major cracks on the surface with subsequent destruction of the blades. Hardening of the surface layers towards thermal fatigue damage was achieved by modifying the structural-phase state to which the nanostructuring of the surface layer relates [5,6,7]. The nanostructured surface layer exhibits damping properties in relation to the base material under shock mechanical and thermal effects, preventing premature nucleation and propagation of main cracks from the surface into the main bulk of the material. This paper presents a part of the results of the study of the pulsed electron irradiation influence in the micro- and submillisecond range of exposure time on the structural-phase state of the Ni3Al intermetallic compound surface layer on the strength and ductility of intermetallic compound samples
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