Indentation Creep Behavior and Microstructure of Cu-Ge Ferrites

Zaki, H.M.; Abdel‐Daiem, A. M.; Swilem, Y.; El-Tantawy, Farid; Al-Marzouki, F.; Al-Ghamdi, Ahmed Abdallah; Al-Heniti, S.; Al-Hazmi, Farag Said; Alharbi, Talal

doi:10.4236/msa.2011.28145

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…H v -t behavior confirmed the basis of the penetration depth of the indenter and reflected the characteristic behavior between H v and t [32]. Also, it was an indication of the material bearing creep deformation [33].…”

Section: Indentation Creepsupporting

confidence: 59%

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

et al. 2017

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In this study, we carried out the Vickers microhardness for Cu0.5Tl0.5Ba2Ca2Cu3O10−δ, (Cu0.5Tl0.5)-1223 superconducting phase added with BaSnO3 nanoparticles. BaSnO3 nanoparticles were prepared by the co-precipitation technique, while the superconductor samples of type (BaSnO3)xCu0.5Tl0.5Ba2Ca2Cu3O10−δ, with 0.00 ≤ x ≤ 1.00 wt.%, were prepared by the conventional solid-state reaction method. Vickers microhardness (Hv) was measured at room temperature and was computed by taking the average of three hits at different locations on the specimen surface. The measurements were performed as a function of the applied load (F = 0.98–9.80 N) and the dwell time (t = 10–59 s). The Hv values were found to be strongly dependent on both the BaSnO3 content and the dwell time. Furthermore, the load independent Vickers microhardness was analyzed using Meyer’s law and different models such as the Hays–Kendall approach (HK), the elastic/plastic deformation model (EPD), the proportional specimen resistance model (PSR) and the modified proportional specimen resistance model (MPSR). The PSR model is found to be the most adequate model in explaining the load independent microhardness for the (BaSnO3)x/(Cu0.5Tl0.5)-1223 superconductor phase. Some important 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. It was found that the addition of proper concentrations of BaSnO3 nanoparticles enhanced the mechanical properties of the prepared samples. The time-dependent microhardness was investigated according to indentation creep experiments showing that the operative creep mechanisms in the studied samples were diffusion creeps at low loads followed by grain boundary sliding as well as dislocation creeps for higher loads.

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Section: Indentation Creepsupporting

confidence: 59%

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

et al. 2017

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“…The H v − t behavior, confirming the basis of the penetration depth of the indenter and reflects the characteristic behavior between H v and t [70]. Also, it is an indication of the material bearing creep deformation [71]. Sargent-Ashby model [72] can be employed to examine the indentation creep behavior of the studied samples.…”

Section: Indentation Creepmentioning

confidence: 52%

Vickers microhardness and indentation creep studies for erbium-doped ZnO nanoparticles

2019

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The effect of erbium (Er) doping on the structural, magnetic and mechanical properties of Zn 1−x Er x O, with 0.00 ≤ x ≤ 0.10, samples was studied using X-ray powder diffraction, M-H magnetic hysteresis and digital Vickers microhardness tester, respectively. The samples were prepared by wet chemical co-precipitation method. Vickers microhardness (H v) measurements were carried out at different applied loads (0.25-10 N) and dwell times (t = 10-60 s) to study the mechanical performance of the samples. Experimental results of H v were analyzed using Meyer's law, and modeled according to Hays-Kendall, elastic/plastic deformation, modified proportional specimen resistance (MPSR) and Indentation Induced Cracking models. It was observed that the MPSR model was the most appropriate model for describing the load independent microhardness data of Er-doped ZnO nanoparticle samples. Indentation creep behavior of Zn 1−x Er x O samples was studied at room temperature by measuring the variation of H v with the dwell times (t = 10-60 s) at fixed applied loads F = 1, 5 and 10 N, respectively. The results showed that Er-doped ZnO nanoparticles samples possessed grain boundary sliding and dislocation climbs at low loads followed by dislocation creep for higher loads within the operative creep mechanism.

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“…The H v -t trend, demonstrating the nature of the indenter's penetration depth and illustrates the typical behavior between H v and t [52]. This is also a predictor of the material bearing creep deformation [53].…”

Section: Time Dependent Vickers Microhardness (Indentation Creep)mentioning

confidence: 59%

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

Rekaby

Shehabi

Awad

2020

Mater. Res. Express

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Nano-scale particles of pure Barium hexaferrite 'BaFe 12 O 19 ' and Cobalt added Barium hexaferrite 'Co x BaFe 12 O 19 ', with x=0.04, 0.06 and 0.1 wt%, were successfully synthesized by the chemical coprecipitation method. The synthesized powder was subjected to different calcination temperatures (T=850°C, 900°C, 950°C and 1050°C). X-ray powder diffraction (XRD) clarified that nearly single phase of BaFe 12 O 19 with tiny traces of Fe 2 O 3 phase were obtained when the precursor was calcined at 1050°C for 2 h. The lattice parameters and unit cell volume were almost unchanged with either Cobalt addition or calcination temperatures. From Debye-Scherrer equation, the crystallite size (D) was found to gradually increase with increasing calcination temperature to reach its maximum values for samples calcined at 1050°C. The formation of Barium hexaferrite phase was also confirmed from Fourier transform infrared (FTIR) spectra through the existence of strong absorption peaks that appeared between 581 cm −1 and 435 cm −1 . The morphology and grain size of the samples were examined using transmission electron microscopy (TEM) technique. Optical properties of the samples were studied through ultraviolet 'UV' visible spectroscopy. The optical band gap (E g ) of the samples was obtained from Tauc relation as function of Cobalt addition (x) and calcination temperature (T). Finally, the mechanical properties were examined using Vickers microhardness. The microhardness data revealed that the samples exhibited reverse indentation size effect (RISE). The Elastic modulus (E) and yield strength (Y) for the prepared samples were calculated, in accordance with Vickers microhardness, as function of Cobalt addition. Furthermore, the indentation size effect ISE was analyzed using indentation induced cracked model (IIC). The IIC model was found to be a suitable model for describing the microhardness results of the prepared samples. Time dependent Vickers microhardness was done through indentation creep test at different dwell time (t=10, 20, 30, 40 and 50 s) and constant applied loads (F=0.98, 4.90 and 9.80 N). Results clarified that the specimens revealed grain boundary sliding together with dislocation climbs at small loads and a dislocation creep in the operating creep process for greater loads.

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Indentation Creep Behavior and Microstructure of Cu-Ge Ferrites

Cited by 8 publications

References 18 publications

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

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

Vickers microhardness and indentation creep studies for erbium-doped ZnO nanoparticles

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

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Indentation Creep Behavior and Microstructure of Cu-Ge Ferrites

Cited by 8 publications

References 18 publications

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

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

Vickers microhardness and indentation creep studies for erbium-doped ZnO nanoparticles

Influence of cobalt addition and calcination temperature on the physical properties of BaFe12O19 hexaferrites nanoparticles

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Product

Resources

About

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

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

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles