Microstructure characterization of nanocrystalline (Ti0.9W0.1) C prepared by mechanical alloying

Slama, C.; Abdellaoui, M.

doi:10.1016/j.ijrmhm.2015.07.018

Cited by 13 publications

(4 citation statements)

References 38 publications

(39 reference statements)

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“…Another signi cant difference is the widening of the Tiβ phase peaks, related to the {110}, {200} and {211} plans present in the powders' XRD pro le. The larger peaks and their electrical lower intensities are due to the milling time used, the high re nement of the niobium grains and the micro-deformation inside these grains [32]. According to Fecht, it was found that grain re nement and micro-deformation increase during the milling [33].…”

Section: Resultsmentioning

confidence: 99%

Effect of the Current Density in the Electrical Resistance Sintering Technique to Fabricate a β-Ti-Nb-Sn Ternary Alloy for the Biomedical Sector

Rossi

Rodríguez

Escuder

et al. 2021

Preprint

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The electrical resistance sintering is a fast method to fabricate metallic samples in the field of metallurgy and it was used to obtain the Ti-Nb-Sn alloy to be applied as biomaterial, variyng different electrical current densities (11, 12 and 13 kA). The powders were obtained by mechanical alloying, then they were compacted at pressure of 193 MPa during 700 ms. The structure and microstructure of the powders and the samples was evaluated by x-ray diffraction, by Field Emission Scanning Electron Microscopy and electron back-scattered diffraction. The mechanical properties were evaluated by microhardness assay and corrosion resistance was made in Ringer Hartmann’s solution at 37ºC. The samples are formed by α, α” and phase β. The % of phase β in the samples obtained at 11, 12 and 13 kA was 96.56, 98.12 and 98.02 respectively. The peripheral zone present more presence of microporosity than the central zone. The microstructure is also formed by bcc-β grains equiaxial, and the samples obtained at 12 kA present better homogeneity of the microstructure. The grain size increased with the increase of the electrical current density. The microhardness are in the range of 389-418 HV and decreased with the increase of electrical current density. Corrosion tests proved excellent corrosion resistance of the alloys (0.24-0.45 µA/cm2). The standard deviation of kinetic parameters of the samples at 11 and 13 kA were very higher, related to the lack of homogeneity of the microstructure.

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Section: Resultsmentioning

confidence: 99%

Effect of the Current Density in the Electrical Resistance Sintering Technique to Fabricate a β-Ti-Nb-Sn Ternary Alloy for the Biomedical Sector

Rossi

Rodríguez

Escuder

et al. 2021

Preprint

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“…are dissolved in the Nb lattice to form the supersaturated Nbss with even smaller lattice parameters. Moreover, the diffraction peaks of Nb are widening and their intensity decreases continuously with increase in ball milling time, which is due to the refinement of Nb grains and the increase of microstrain inside the grains [28,29]. The mechanism of grain refinement and microstrain increase during milling was previously studied by Fecht [30] and Xun et al [31].…”

Section: Methodsmentioning

confidence: 93%

Microstructural Evolution, Thermal Stability and Microhardness of the Nb–Ti–Si-Based Alloy during Mechanical Alloying

Zhang¹,

Guo²

2018

Metals

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Amorphization of the Nb-20Ti-15Si-5Cr-3Hf-3Al (at %) alloy is realized by mechanical alloying (MA). The amorphous phase formation and microstructural evolution are investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). During ball milling, the phase constituent of the alloy powder exhibits a transition from most supersaturated Nb-based solid solutions (Nbss) and a small amount of amorphous phases (after 20 h of ball milling) to a completely amorphous state (after milling for 40 h), which is accompanied by evolution of the powder morphology from flakes to aggregates and eventually to refined granules. The thermal stability of the milled amorphous powders is studied using differential scanning calorimetry (DSC). With the increase of heating temperature, the distortion energy stored during ball milling is released, followed by a transformation from amorphous phase to Nbss and γ-Nb 5 Si 3 phases. In addition, the Vickers microhardness remarkably increases, as a result of the amorphous phase formation in the matrix.

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“…The generated microstrain (e) from the lattice distortion can be estimated from the Stock-Wilson (SW) formula [21]: The estimation of average crystallite size and the microstrain-induced broadening are both associated with the XRD peak broadening analysis. The Debye-Scherrer approach, however, offers no information regarding the microstrain.…”

Section: /Bmentioning

confidence: 99%

Impact of Mg-doping on the structural, optical, and magnetic properties of CuO nanoparticles and their antibiofilm activity

et al. 2023

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Doping in metal oxide systems is being chased by many researchers since it is enhancing their properties. In the present study, Cu1-xMgxO nanoparticles, capped with EDTA were synthesized by the chemical co-precipitation method, with x = 0.000, 0.005, 0.010, 0.015, and 0.020, and further characterized by different techniques. The impact of doping by Mg2+ ions on the structural, optical, and magnetic properties of CuO nanoparticles was investigated and the antibacterial activity of the synthesized nanoparticles was studied by antibiofilm screening. The X-ray Powder Diffraction (XRD) patterns show the formation of a pure CuO phase with a good incorporation of Mg-dopant into the CuO lattice due to the comparable ionic radii of Cu2+ and Mg2+ ions. The Mg-dopant increases the crystallite size from 25 nm (at x = 0.000) to 28.12 nm (at x = 0.020). The Transmission Electron Microscope (TEM) images reveal the effect of Mg-doping on the morphology of CuO nanoparticles by decreasing their agglomeration, resulting in more uniform spherical-shaped nanoparticles. Energy Dispersive X-ray (EDX) and X-ray Photoelectron Spectroscopy (XPS) confirm the purity and the successful development of Mg-doped CuO nanoparticles. The changes in the characteristic vibrational modes of CuO are studied by Raman spectra, upon Mg-doping. Furthermore, the optical properties explored by Ultraviolet-Visible (UV-Vis) spectroscopy reveal a redshift of the absorption peaks of CuO nanoparticles due to the Mg-doping. The energy gap (Eg) is affected by Mg-doping, where its broadening is attributed to the quantum confinement effect in CuO. The magnetic properties were investigated by Vibrating Sample Magnetometer (VSM) at room temperature. Cu1-xMgxO nanoparticles have combined paramagnetic and weak ferromagnetic behaviors. Besides, Cu1-xMgxO nanoparticles exhibited significant antibiofilm effects. These results highlight the potential use of Mg-doped CuO nanoparticles as antibiofilm agents.

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Microstructure characterization of nanocrystalline (Ti0.9W0.1) C prepared by mechanical alloying

Cited by 13 publications

References 38 publications

Effect of the Current Density in the Electrical Resistance Sintering Technique to Fabricate a β-Ti-Nb-Sn Ternary Alloy for the Biomedical Sector

Effect of the Current Density in the Electrical Resistance Sintering Technique to Fabricate a β-Ti-Nb-Sn Ternary Alloy for the Biomedical Sector

Microstructural Evolution, Thermal Stability and Microhardness of the Nb–Ti–Si-Based Alloy during Mechanical Alloying

Impact of Mg-doping on the structural, optical, and magnetic properties of CuO nanoparticles and their antibiofilm activity

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