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The study is centred on preparation and microstructural analysis of Cu composites containing different volume contents of secondary phases (MgO, Al2O3). The microstructure evolution is observed during the preparation of a nanocrystalline powder and after its processing into a compact. Effect of the dispersed oxide phases on preservation of the initial nanostructure is analyzed. The composites were prepared by thermo-chemical transformations of precursors (CuO+MgO, CuO+Al2O3) and mechanical milling followed by spark plasma sintering technique. The microstructure development of the powders during their preparation and subsequent compaction is characterized by metallographic observations and X-ray diffraction analysis. Mechanical properties were tested by micro and macro-hardness measurements. From the study follows that the Cu materials containing Al2O3dispersoid exhibit improved thermal stability and higher hardness values compared to the Cu materials dispersion strengthened by MgO particles.
Keywords: Dispersion strengthening, mechanical milling, X-ray diffraction analysis, thermal stability© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.