Abstract
In this work, FeCr-based films with different Y2O3 contents were fabricated using radio frequency (RF) magnetron sputtering. The effects of Y2O3 content on their microstructure and mechanical properties were investigated through scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), inductive coupled plasma emission spectrometer (ICP) and a nanoindenter. It was found that the Y2O3-doped FeCr films exhibited a nanocomposite structure with nanosized Y2O3 particles uniformly distributed into a FeCr matrix. With the increase of Y2O3 content from 0 to 1.97 wt.%, the average grain size of the FeCr films decreased from 12.65 nm to 7.34 nm, demonstrating a grain refining effect of Y2O3. Furthermore, the hardness of the Y2O3-doped FeCr films showed an increasing trend with Y2O3 concentration, owing to the synergetic effect of dispersion strengthening and grain refinement strengthening. This work provides a beneficial guidance on the development and research of composite materials of nanocrystalline metal with a rare earth oxide dispersion phase.
Highlights
The mechanical properties of FeCr films, Y2O3/FeCr composite targets with 0, 1, 2 and 4 pieces surface and cross-section morphology of the films were observed by field emission scanning of Y2O3 slices were used during sputtering (Figure1a), and the resultant films were electron microscopy (FESEM, Sirion 200FEG, HITACHI, Japan, accelerating voltage 5 keV)
In order to investigate the effects of Y2 O3 addition on the microstructure and mechanical properties of FeCr films, Y2 O3 /FeCr composite targets with 0, 1, 2 and 4 pieces of Y2 O3 slices were used during sputtering (Figure 1a), and the resultant films were designated as
3d5/2 electrons in molecular Y2 O3. This result indicates that the Y elements exist in the form of Y2 O3 in fabricated films, which is in line with the expectation of realizing oxide dispersion strengthening in FeCr based films by radio frequency magnetron sputtering (RFMS) methods
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. FeCr alloys with the addition of oxide particles have been shown to have high tensile, creep and fatigue strength, have thermal stability through the promotion of radiation-induced defect recombination, trap. He atoms and impede dislocation climb and glide [15]. The grain refinement of structural materials is treated as one of the effective methods of optimizing the strength and irradiation resistance properties, owing to the high density of interface, especially in nanocrystalline materials, as reported in nanocrystalline Au (grain size~23 nm) [20] and TiNi alloys (grain size 23–31 nm) [21]. In this work, the magnetron sputtering ODS-FeCr films were prepared and researched in order to provide a beneficial guidance for the research and development of fission reactor structural materials in the future
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