Browsing by Author "Anisimov, Alexander G."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Open Access Metallic iron or a Fe-based glassy alloy to reinforce aluminum: reactions at the interface during spark plasma sintering and mechanical properties of the composites(MDPI, 2023-07-23) Dudina, Dina V.; Kvashnin, Vyacheslav I.; Bokhonov, Boris B.; Legan, Mikhail A.; Novoselov, Aleksey N.; Bespalko, Yuliya N.; Moreira Jorge, Alberto; Koga, Guilherme Y.; Ukhina, Arina V.; Shtertser, Alexandr A.; Anisimov, Alexander G.; Georgarakis, KonstantinosThe microstructural features and mechanical properties of composites formed by spark plasma sintering (SPS) of Al + 20 vol.% Fe and Al + 20 vol.% Fe66Cr10Nb5B19 (glassy alloy) mixtures composed of micrometer-sized particles are presented. The interaction between the mixture components was studied by differential thermal analysis and through examining the microstructure of composites sintered at two different SPS pressures. When the pressure was increased from 40 MPa to 80 MPa, the thickness of the reaction products formed between the iron particles and aluminum increased due to a more intimate contact between the phases established at a higher pressure. When the metallic glass was substituted for iron, the pressure increase had an opposite effect. It was concluded that local overheating at the interface in the case of Al + 20 vol.% Fe66Cr10Nb5B19 composites governed the formation of the product layers at 40 MPa. The influence of the nature of reinforcement on the mechanical properties of the composites was analyzed, for which sintered materials with similar microstructural features were compared. In composites without the reaction products and composites with thin layers of the products, the hardness increased by 13–38% relative to the unreinforced sintered aluminum, the glassy alloy and iron inclusions producing similar outcomes. The effect of the nature of added particles on the hardness and compressive strength of composites was seen when the microstructure of the material was such that an efficient load transfer mechanism was operative. This was possible upon the formation of thick layers of reaction products. Upon compression, the strong glassy cores experienced fracture, the composite with the glassy component showing a higher strength than the composite containing core-shell structures with metallic iron cores.Item Open Access Microstructure and mechanical properties of composites obtained by spark plasma sintering of Al–Fe66Cr10Nb5B19 metallic glass powder mixtures(MDPI, 2021-09-15) Dudina, Dina V.; Bokhonov, Boris B.; Batraev, Igor S.; Kvashnin, Vyacheslav I.; Legan, Mikhail A.; Novoselov, Aleksey N.; Anisimov, Alexander G.; Esikov, Maksim A.; Ukhina, Arina V.; Matvienko, Alexander A.; Georgarakis, Konstantinos; Koga, Guilherme Yuuki; Jorge, Alberto MoreiraAt present, metallic glasses are evaluated as alternative reinforcements for aluminum matrix composites. These composites are produced by powder metallurgy via consolidation of metallic glass-aluminum powder mixtures. In most studies, the goal has been to preserve the glassy state of the reinforcement during consolidation. However, it is also of interest to track the structure evolution of these composites when partial interaction between the matrix and the metallic glass is allowed during sintering of the mixtures. The present work was aimed to study the microstructure and mechanical properties of composites obtained by spark plasma sintering (SPS) of Al-20 vol.% Fe66Cr10Nb5B19 metallic glass mixtures and compare the materials, in which no significant interaction between the matrix and the Fe-based alloy occurred, with those featuring reaction product layers of different thicknesses. Composite materials were consolidated by SPS at 540 and 570 °C. The microstructure and mechanical properties of composites obtained by SPS and SPS followed by forging, composites with layers of interfacial reaction products of different thicknesses, and metallic glass-free sintered aluminum were comparatively analyzed to conclude on the influence of the microstructural features of the composites on their strength.