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• W4384075584 endingPage "321" @default.
• W4384075584 startingPage "275" @default.
• W4384075584 abstract "The chapter includes three parts. The first one presents the research results on the microstructure and properties of a metal-matrix composite fabricated by the fusion of the Ti–6Al–4V wire and the TiC powder using electron beam additive manufacturing. The TiCx/Ti–6Al–4V composites were characterized by the uniform distribution of TiC globular eutectic particles in the titanium matrix. The segregation of the TiC eutectic phase particles along the boundaries of primary β grains caused reducing their dimensions with rising the TiC volume fraction. In the TiC8%/Ti–6Al–4V and TiC20%/Ti–6Al–4V samples, primary β-phase grain sizes ranged from 30 to 100 µm. Inside them, martensitic α-phase plates were observed in addition to the TiC eutectic phase particles, which distribution density rose as the TiC volume fraction increased. The main phases in the TiCx/Ti–6Al–4V composites were the α-Ti, β-Ti and TiC ones. The β-Ti volume fraction varied within 3–5% regardless of the TiC contents. According to the X-ray diffraction analysis data, rising the TiC volume fraction was accompanied by increasing the lattice parameters of the α-Ti solid solution due to the presence of carbon atoms. At the TiC contents less than 10%, the levels of residual compressive stresses varied in the range from 0.7 to 0.9 GPa, weakly depending on its volume fraction. In the TiC20%/Ti–6Al–4V sample, the valued of residual compressive stresses was 1.5 GPa. Enhancing the TiC volume fraction in the TiCx/Ti–6Al–4V composites caused rising the microhardness values of both matrix and eutectic particles. Their maximum levels values (6400 and 8400 MPa, respectively) were found in the TiC20%/Ti–6Al–4V sample. The TiCx/Ti–6Al–4V composites were also characterized by the greater tensile strength values but lower ductility compared to those of the Ti–6Al–4V alloy sample, fabricated by the same EBAM method. The TiC5%/Ti–6Al–4V sample possessed the maximum ultimate tensile strength of 1040 MPa. At the TiC volume fractions of 8% and more, the TiCx/Ti–6Al–4V composites experienced almost no plastic strains and brittle fracture occurred when applied stresses exceeded their yield points. The second part reports patterns of the structure formation and their effect on the tribological properties of 3D-printed composites based on polyetheretherketone (PEEK) filled with nanoparticles of hydroxyapatite (HA) and polytetrafluoroethylene (PTFE). Compared with neat PEEK, its simultaneous loading with HA and PTFE deteriorated the composite structure to some extent. However, the wear rate level was greatly reduced and microabrasive damages to both steel and ceramic counterparts were eliminated by facilitating the transfer film formation. In addition to the self-lubricating effect of the formed composite structure, another (probable) reason for such a protection of the steel counterpart was the shielding effect of a transfer film from the standpoint of suppressing tribological oxidative processes during its interaction with PEEK. The slight lowering of the physical and mechanical properties of the composite fabricated by 3D printing, compared with hot-compressed one, was associated with the specifics of the additive manufacturing process. In this case, the interlayer adhesion had been reduced and the complete internal space filling had not been provided during the layer-by-layer formation of the composite macrostructure due to the decrease in the melt flow rate after loading PEEK with HA nanoparticles. Finally, the influence of forming intermediate phases between a matrix and inclusions on the evolution of the functional properties of composites is shown. The methods of micromechanics and the reactive diffusion theory have been applied for assessing changes in the functional properties of both Fe- and Ti–Al–C composites during their synthesis." @default.
• W4384075584 created "2023-07-13" @default.
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• W4384075584 date "2023-01-01" @default.
• W4384075584 modified "2023-09-28" @default.
• W4384075584 title "Controlling the Structure and Properties of Metal- and Polymer-Based Composites Fabricated by Combined 3D Methods" @default.
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• W4384075584 doi "https://doi.org/10.1007/978-3-031-28744-2_12" @default.
• W4384075584 hasPublicationYear "2023" @default.

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