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Fabrication of AA2024/SiCp Metal Matrix Composite by Mechanical Alloying
O. V. Rofman,A. S. Prosviryakov,A. D. Kotov,A. I. Bazlov,P. O. Milovich,Gopalu Karunakaran,A. V. Mikhaylovskaya 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
Mechanical alloying is a widely used alternative to the liquid-phase method of embedding reinforcements to manufacturemetal matrix composites (MMC). In this research, high-energy ball milling was used to distribute various volume fractionsof sub-micron-sized SiCpparticles (2, 10, and 20 vol%) in AA2024 aluminum powder alloy, focusing on powder morphologyand milling conditions. An increase in the full width at half-maximum and the shifting of peaks at higher angles wereobserved after mechanical alloying. These examinations were attributed to changes in the lattice parameters of the matrixalloy. It was noted that the temperature and loading pressure during the die compaction stages of MMC powders directlyaffect the compact density, whereas the volume fraction of SiCpchanges hardness. Compression testing, conducted at elevatedtemperatures to evaluate the plastic properties of the material, showed sufficient ductility characteristics for thermomechanicalprocessing.
Microstructure and Properties of Novel Heat Resistant Al–Ce–Cu Alloy for Additive Manufacturing
D. R. Manca,A. Yu. Churyumov,A. V. Pozdniakov,A. S. Prosviryakov,D. K. Ryabov,A. Yu. Krokhin,V. A. Korolev,D. K. Daubarayte 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
The microstructure and properties of the novel heat resistant Al–3Ce–7Cu alloy produced by selective laser melting wereinvestigated. Fine Al11Ce3and Al6.5CeCu6.5eutectic phases were found in the microstructure. Annealing at temperatures inthe 250–400 °C range leads to a decrease in the hardness. Hardness has larger values after annealing at 350 and 400 °C thanat 250 °C due to the precipitation of nanosized particles. The low hardness after quenching and aging at 190 °C is causedby quench stress relief and the absence of aging hardening because of poor solid solution. The as-printed yield strength,ultimate tensile strength and elongation are 274 MPa, 456 MPa and 4.4%, respectively. High mechanical properties of theAl–3Ce–7Cu alloy were demonstrated by high temperature tension and compression tests.