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Research Highlight:
- The proposed model provides an efficient tool for predicting extrusion force, deformation geometry, and strain localization in the backward extrusion of ultra-thin-walled tubes.
- The analytically predicted extrusion force shows acceptable agreement with experimental measurements, while the analytically determined deformation depth T exhibits consistent agreement with both metallographic observations and FEM-based strain-field analysis.
- The generality of the analytical framework is demonstrated through extensive parametric analyses covering a range of wall thicknesses, billet radii, and reduction ratios for thin and ultra-thin-walled tubes.
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- WC, WC-Co, and WC-Cr specimens were fabricated using spark plasma sintering.
- The influence of the process parameters on final properties of the WC was studied.
- The effect of binders’ content on final performance of the cermets is discussed.
- The cermets showed higher tribomechanical performance compared to pure WC.
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Manuscript Title: The effect of lanthanum substitution on the ferroelectric and piezoelectric properties of (Pb0.88Sr0.12)(Zr0.54Ti0.44Sb0.02)O3 ceramics
- Optimal La doping (0.5 mol%) drastically enhances piezoelectric performance, achieving a high piezoelectric coefficient (d33) of 635 pC/N and an electromechanical coupling factor (kp) of 0.67.
- Lanthanum acts as a powerful sintering aid, increasing the bulk density to a maximum of 7.34 g.cm-3 for the 1.0 mol% La-doped sample sintered at 1280°C.
- Significant improvement in dielectric properties is observed, with the relative permittivity (εr) reaching 3000 and the dielectric loss (tan δ) remaining low at 0.018 for the 0.5 mol% La composition.
- La substitution effectively refines the microstructure, reducing the average grain size and its standard deviation, which is linked to improved mechanical reliability.
- The developed La-doped PSZTS ceramics demonstrate a superior property combination, making them highly promising for advanced piezoelectric applications such as high-sensitivity transducers, receivers, and large-displacement actuators.
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- Improvement of surface mechanical properties of the coated materials
- Apply mechanical treatment by impacts on the coated surface
- Examination of the effect of the single shot impacts on the coated surface
- Crystal Grain refinement of the coating layer by mechanical treatments on the coating surface
- Obtain a relationship between impact speed with average grain size
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- Rod-like CuO NPs was prepared by a facile sol-gel method.
- CuO NPs has monoclinic crystal structure with Cu2+ oxidation state.
- Optical band gap is determined from Tauc plot.
- The synthesized NPs possess enhanced visible PL emission.
- The efficiency and scattering factors were calculated using Mie theory.
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- High strength conductive geopolymer for smart building applications.
- Effect of adding carbon black on mechanical and electrical properties.
- Equivalent electrical circuit of pure and conductive geopolymer.
- Conductive geopolymer with stable electrothermal performance.
- The reason for deterioration of electrothermal performance.
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HILIGHTS
- A multiphase Fe₃O₄/ZnTiO₃/MWCNT nanocomposite was successfully engineered as an X‑band impedance‑matching thin film.
- Optimized composition (C4) achieved enhanced filler dispersion and superior electromagnetic matching performance.
- WR‑90 waveguide measurements (8.2–12.4 GHz) confirmed a reflection coefficient of −17.85 dB for a 1 mm thick sample.
- ZnTiO₃ significantly improved impedance matching, while Fe₃O₄ governed magnetic loss and MWCNTs enhanced electrical conductivity.
- Experimental results were validated by CST frequency‑domain simulations with accetable agreement.
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