Influence of Milling Time on Structural and Microstructural Parameters of Ni<sub>50</sub>Ti<sub>50</sub> Prepared by Mechanical Alloying Using Rietveld Analysis

Sakher, E.; Loudjani, N.; Benchiheub, M.; Bououdina, M.

doi:10.1155/2018/2560641

Cited by 39 publications

(18 citation statements)

References 40 publications

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“…For the variation of the microstrain, it is noted that the smallest value was obtained for the Q1 phase irrespective of the clay samples, i.e., setting in the range 0.077–0.178%, while the highest value of the microstrain belonged to the F phase, i.e., 7.6% for sample (S1). Furthermore, it is important to highlight that the values of crystallite size and microstrain are inversely proportional [ 59 ].…”

Section: Resultsmentioning

confidence: 99%

Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays

et al. 2022

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With the increasing applications of nuclear technology, radiation protection has become very important especially for the environment and the personnel close to radiation sources. Natural clays can be used potentially for shielding the X-ray radiations. In this study, the correlation between structural parameters and radiation shielding performance of natural clay extracted from Algerian Sahara (Adrar, Reggan, and Timimoune) was investigated. Phase composition and structural parameters (lattice parameters, average crystallite size, and microstrain) were determined by the Rietveld refinements of X-ray diffraction patterns in the frame of HighScore Plus software. The obtained results showed that the studied clays are nanocrystalline (nano-clay) since the calculated crystallite size was ≈3 nm for the feldspar phase. FTIR spectra confirmed the presence of all phases already detected by XRD analysis besides Biotite (around the band at 3558 cm−1). The remaining bands corresponded to absorbed and adsorbed water (3432 cm−1 and 1629 cm−1, respectively) and atmospheric CO2 (2356 cm−1). The shielding properties (mass absorption coefficient—µ/ρ and radiative attenuation rate—RA) for (green-yellow, green, and red) clays of Adrar, (red, white, and white-red) clays of Reggan, and red clay of Timimoune at same energy level were examined. The results of clay samples were compared with each other. The obtained results indicated that the green clay of Adrar exhibited the superior radiation shielding, i.e., 99.8% and 243.4 cm2/g for radiative attenuation rate and mass absorption coefficient, respectively.

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Section: Resultsmentioning

confidence: 99%

Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays

et al. 2022

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“…These defects increase nucleation sites as well as increase low-angle grain boundaries, resulting in reduced crystallite size. 40,41 By increasing the crystal defects along with increasing the milling time and atomic diffusion, and as a result, the possibility of alloying is facilitated. 42–44 The crystallite size and lattice strain of the alloy powders have been calculated from XRD peak broadening using Williamson-Hall equation as follows and listed in Table 1. …”

Section: Resultsmentioning

confidence: 99%

Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

Naser-Zoshki¹,

Rashid²,

Vahdati-Khaki³

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this work, non-equiatomic W10Mo27Cr21Ti22Al20 refractory high-entropy alloy (RHEA) was produced using mechanical alloying followed by spark plasma sintering. The phase formation, microstructure, and compressive mechanical properties of the alloy were studied. During mechanical alloying, a Body-centered cubic (BCC) solid solution phase with a particle size of less than 1 µm was obtained after 18 h ball milling. The microstructure of the sintered sample exhibits three distinct phases consisting of two solid solution phases BCC1 and BCC2 as well as fine TiCxOy precipitates distributed in them. The volume fractions of each phase were about 79%, 8%, and 13%, respectively. The sintered W10Mo27Cr21Ti22Al20 showed yield strengths of 2465, 1506, 405, and 290 MPa at room temperature 600, 1000, and 1200°C, respectively, which are about twice that of the same refractory high-entropy alloy produced by vacuum arc melting. At 1000 and 1200°C, the strength after yielding gradually increased to 970 and 718 MPa at a compressive strain of 60%. The studied refractory high-entropy alloy can have good potential in high-temperature applications due to its high specific strength at elevated temperatures compared to conventional Ni-based superalloys and most as-reported refractory high-entropy alloys.

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“…However, we also observed that as the milling time increased, the XRD peak intensities decreased and the width of the peaks broadened. This also indicated a decrease in the particle size of the samples [55]. In addition, the strain created during the milling process also resulted in a drop in peak intensity and the widening of diffraction peaks as the particle size decreased.…”

Section: Structural Analysismentioning

confidence: 91%

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

et al. 2021

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This study presents the utilization of mill scale waste, which has attracted much attention due to its high content of magnetite (Fe3O4). This work focuses on the extraction of Fe3O4 from mill scale waste via magnetic separation, and ball milling was used to fabricate a microwave absorber. The extracted magnetic powder was ground-milled using two different techniques: (i) a conventional milling technique (CM) and (ii) mechanical alloying (MM) process. The Fe3O4/CM samples were prepared by a conventional milling process using steel pot ball milling, while the Fe3O4/MM samples were prepared using a high-energy ball milling (HEBM) method. The effect of milling time on the structural, phase composition, and electromagnetic properties were examined using X-ray diffraction (XRD) and a vector network analyzer (VNA). XRD confirmed the formation of magnetite after both the magnetic separation and milling processes. The results revealed that Fe3O4 exhibited excellent microwave absorption properties because of the synergistic characteristics of its dielectric and magnetic loss. The results showed that the Fe3O4/CM particle powder had a greater absorption power (reflection loss: <−10 dB) with 99.9% absorption, a minimum reflection loss of −30.83 dB, and an effective bandwidth of 2.30 GHz for 2 mm thick samples. The results revealed the Fe3O4/MM powders had higher absorption properties, including a higher RL of −20.59 dB and a broader bandwidth of 2.43 GHz at a matching thickness of only 1 mm. The higher microwave absorption performance was attributed to the better impedance matching property caused by the porous microstructure. Furthermore, the magnetite, Fe3O4 showed superior microwave absorption characteristics because of the lower value of permittivity, which resulted in better impedance matching. This study presents a low-cost approach method by reutilizing mill scale waste to fabricate a high purity crystalline Fe3O4 with the best potential for designing magnetic nano-sized based microwave absorbers.

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Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Cited by 39 publications

References 40 publications

Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays

Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays

Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

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Influence of Milling Time on Structural and Microstructural Parameters of Ni50Ti50 Prepared by Mechanical Alloying Using Rietveld Analysis

Cited by 39 publications

References 40 publications

Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays

Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays

Non-equiatomic W10Mo27Cr21Ti22Al20 high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

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Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Non-equiatomic W₁₀Mo₂₇Cr₂₁Ti₂₂Al₂₀ high-entropy alloy produced by mechanical alloying and spark plasma sintering: Phase evolution and mechanical properties