Mechanical properties of the (BaSnO3)x/Cu0.5Tl0.5Ba2Ca2Cu3O10−δsuperconductor phase

Srour, A.; Malaeb, Walid; Rekaby, M.; Awad, R.

doi:10.1088/1402-4896/aa86ce

Cited by 13 publications

(3 citation statements)

References 38 publications

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“…The Vickers microhardness (H v) values of the Zn 1−x Sm x O nanoparticles with x=0.00, 0.01, 0.02, 0.04, 0.06 and 0.10 were measured in air using a digital microhardness tester (MHVD-1000IS) at room temperature. The applied loads F range from 0.25 N to 10 N for dwell time t=60 s. For each value of F, the mean value of three H v readings, taken at different locations of the sample's surface to ensure the accuracy of H v , was calculated using equation (1) by measuring the dimension of the diagonal length of the indentation d (μm) [27].…”

Section: Experimental Techniquesmentioning

confidence: 99%

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

Badreddine

Srour

Awad

et al. 2020

Mater. Res. Express

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Zn1−xSmxO nanoparticles, with 0.00 ≤ x ≤ 0.10, were prepared using chemical co-precipitation method. The structure and morphology of the obtained samples were characterized using x-ray powder diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), respectively. However, the mechanical properties were investigated via digital Vickers microhardness tester. Vickers microhardness measurements were carried out at different applied loads, varying between 0.5 and 10 N at dwell time 60 s on pressed discs of average thickness 3 mm. Hv decreased as the Sm-content increased up to 0.02 and then it increased for higher concentrations. Whereas, it increased as the applied load increased, revealing that the samples exhibited a reverse indentation size effect (ISE). The microhardness measurements were interpreted using various models such as Meyer’s law, Hays and Kendall (HK) approach, elastic/plastic deformation (EPD), proportional specimen resistance (PSR) and the indentation-induced cracking (IIC). Mechanical parameters such as Young’s modulus (E), yield strength (Y), fracture toughness (K) and brittleness index (B) were calculated as a function of x. The most adequate model for the true microhardness of these samples is IIC. It was found that the addition of Sm content enhanced the mechanical properties of the prepared samples after x = 0.02. Dielectric measurements were used to compute different parameters such as real and imaginary parts of the complex permittivity, dielectric loss (tan δ) and ac conductivity (σ ac).

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Section: Experimental Techniquesmentioning

confidence: 99%

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

Badreddine

Srour

Awad

et al. 2020

Mater. Res. Express

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“…Different loads varying from 0.245 to 4.90 N, at a dwell loading time of 30 seconds, were applied. For each load, three different hits at different positions on the sample's surface were applied and Vickers microhardness value was determined using the given equation (Srour et al, 2017;Zalaoglu et al, 2017):…”

Section: Vickers Microhardnessmentioning

confidence: 99%

A Comprehensive Study on the Effect of ZnO and ZnAl2O4 Nanoparticles on the Mechanical Properties of Epoxy Coating: Tensile and Hardness

Shmait¹,

Ghouch²,

Boukhari³

et al. 2021

MAS

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ZnO and ZnAl2O4 nanoparticles (NPs) were successfully prepared by the co-precipitation method and characterized by x-ray powder diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The prepared NPs were incorporated into epoxy (EP) coating with mass ratios 200  800 mg/kg of ZnO NPs/EP and ZnAl2O4 NPs /EP. The prepared coatings were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy, and their mechanical properties were investigated, at room temperature, after 5, 10, 15, and 20 days of preparation. Tensile tests showed an improvement in the tensile properties, with the best improvement in ultimate tensile strength (93.2%) for 800 mg/kg ZnAl2O4 NPs/EP coating after 15 days of preparation. The ZnO NPs/EP and ZnAl2O4 NPs/EP coatings exhibited noticeable sensitivity to the stretching rate. Vickers microhardness (Hv) investigations showed normal indentation size effect behavior for all the samples. The best improvement in Hv was attained after 5 days of preparation, for all coatings, with the best improvement (9.15%) for 700 mg/kg ZnO NPs/EP.

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“…The results indicated that adding nano-SnO 2 up to 1.0 wt% improved the mechanical characteristics of CuTl-1223, whereas just a little amount of nano-In 2 O 3 , x = 0.1 wt%, increased the phase's Vickers hardness. The impact of nano-BaSnO 3 addition in CuTl-1223 superconducting bulk was examined by Srour et al [6]. The results indicated that microindentation Vickers hardness values rose up to x = 0.25 wt%, then dropped with a further rise in x till 1.0 wt%.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, microstructure and indentation Vickers hardness for (Y3Fe5O12)x/Cu0.5Tl0.5Ba2Ca2Cu3O10-δ composites

et al. 2022

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High-performance and low-cost composites are engineers’ dream for technological applications. To fulfill the material for an engineering application, it is important to understand the mechanical properties of the material. The primary goal of this research is to investigate the impact of nano-sized Yttrium iron garnet (Y3Fe5O12) addition on the microstructure and mechanical properties of the polycrystalline Cu0.5Tl0.5Ba2Ca2Cu3O10-δ (CuTl-1223) superconductor. Co-precipitation and solid-state reaction methods were utilized to prepare Y3Fe5O12 nanoparticles and Cu0.5Tl0.5Ba2Ca2Cu3O10-δ superconductor, respectively. (Y3Fe5O12)x/Cu0.5Tl0.5Ba2Ca2Cu3O10-δ nanoparticle/superconductor composites were formed by adding small contents of Y3Fe5O12 (x = 0.00, 0.02, 0.04, 0.06, 0.08, and 0.10 wt%) to the CuTl-1223 matrix. The volume fraction percentage of the main phase, CuTl-1223, was increased from 87.9 to 91.4% as x was adjusted from 0.00 to 0.04 wt%. The unit cell parameters (a and c) remained unchanged following the addition of Y3Fe5O12 nanoparticles to the host CuTl-1223. The porosity percentage (P %) was decreased from 39.1 to 29.4% as x was increased from 0.00 to 0.10 wt%. Thus, the addition of Y3Fe5O12 nanoparticles has the ability to reduce weak links and voids among the CuTl-1223 superconducting grains. The grain morphology for the prepared composites was identified through scanning electron microscopy. The different elemental compositions were detected by energy-dispersive X-ray measurements. Vickers microindentation hardness test was employed to study the mechanical strength of the prepared composites. Analysis and modelling of Vickers hardness (Hv) versus test load (F) were done through various models. Meyer’s empirical law showed that all the prepared composites follow normal indentation size effect behaviour. Hays and Kendall model clarified that the applied test load was sufficient to produce both elastic and plastic deformation for the investigated samples. The elastic/plastic deformation model indicated that the prepared samples contain an elastic relaxation portion that recovers after withdrawing the test load. The proportional sample resistance and modified proportional sample resistance models confirmed the HK model findings. Moreover, the HK model was found to be the most suitable model for describing the microhardness results of the prepared samples. Furthermore, the elastic modulus (E), yield strength (Y), fracture toughness (K) and brittleness index (B) for the prepared composites were calculated as function of Y3Fe5O12 addition.

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Mechanical properties of the (BaSnO₃)x/Cu_0.5Tl_0.5Ba₂Ca₂Cu₃O_10−δsuperconductor phase

Cited by 13 publications

References 38 publications

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

A Comprehensive Study on the Effect of ZnO and ZnAl2O4 Nanoparticles on the Mechanical Properties of Epoxy Coating: Tensile and Hardness

Synthesis, microstructure and indentation Vickers hardness for (Y3Fe5O12)x/Cu0.5Tl0.5Ba2Ca2Cu3O10-δ composites

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