Lattice strain estimation for CoAl2O4 nano particles using Williamson-Hall analysis

Aly, K.A.; Khalil, N.M.; Algamal, Yousif; Saleem, Qaid M.

doi:10.1016/j.jallcom.2016.03.213

Cited by 113 publications

(23 citation statements)

References 29 publications

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“…Also, the anisotropic nature of the elastic constants of the crystal can be incorporated in the Williamson-Hall analysis by using uniform deformation stress (UDSM) or uniform deformation energy density (UDEDM) models [8,12,13]. A number of reports on the Williamson-Hall analysis of nanostructured samples of different kinds have appeared in the literature in the recent past [6,[12][13][14][15][16][17][18][19][20][21][22][23]. A perusal of these reports reveals that models which take into account the anisotropic nature of the crystal, viz., UDSM and UDEDM often more correctly model the system than the one which does not take the anisotropy into account viz., UDM [6,[13][14][15][16][17]20].…”

Section: Introductionmentioning

confidence: 99%

X-ray diffraction line profile analysis of nanostructured nickel oxide: Shape factor and convolution of crystallite size and microstrain contributions

Maniammal

Madhu

Biju

2017

Physica E: Low-dimensional Systems and Nanostructures

142

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Section: Introductionmentioning

confidence: 99%

X-ray diffraction line profile analysis of nanostructured nickel oxide: Shape factor and convolution of crystallite size and microstrain contributions

Maniammal

Madhu

Biju

2017

Physica E: Low-dimensional Systems and Nanostructures

142

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“…Conversely, the nanocrystalline MCrAlY coating has a relatively higher amount of the trendline slope. Further relevant studies based on the examinations of the crystalline size using Williamson–Hall estimations have supported this fact 48 , 49 .…”

Section: Resultsmentioning

confidence: 75%

A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

Ghadami

Rouhaghdam

Ghadami

2021

Sci Rep

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Conventional and nanocrystalline MCrAlY coatings were applied by the high-velocity oxy-fuel (HVOF) deposition process. The ball-milling method was used to prepare the nanocrystalline MCrAlY powder feedstock. The microstructure examinations of the conventional and nanocrystalline powders and coatings were performed using X-ray diffraction (XRD), high-resolution field emission scanning electron microscope (FESEM) equipped with energy-dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). Williamson–Hall analyzing method was also used for estimation of the crystalline size and lattice strain of the as-milled powders and sprayed coatings. Owing to the investigation of the oxidation behavior, the freestanding coatings were subjected to isothermal and cyclic oxidation testing at 1000 and 1100 °C under static air. The results showed that the conventional as-sprayed MCrAlY coating had a parabolic behavior in the early stage and prolonged oxidation process. On the contrary, in the case of the nanocrystalline MCrAlY coating, the long-term oxidation behavior has deviated from parabolic to sub-parabolic rate law. Moreover, the results also exemplified that the nanocrystalline MCrAlY coating had a greater oxidation resistance following the creation of a continuous and slow-growing Al2O3 scale with a fine-grained structure. The nucleation and growth mechanisms of the oxides formed on the nanocrystalline coating have also been discussed in detail.

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“…The diffraction peaks of the α phase are clear, while most of the diffraction peaks of the β phase are too weak to identify. On the basis of the XRD test data, we estimated the amount of the rise in dislocation density of the α phase according to the Williamson-Hall formulation [25][26][27] n cos θ/λ = 2/D + 4e sin θ/λ, where n is the full width at half maximum (FWHM) of the diffraction peak, θ is the diffraction angle of the peak, λ is the X-ray wavelength equaling 1.542 Å, D is the characteristic grain size and e is the lattice strain which has the relationship [28] ρ ≈ 16e 2 /b 2 with the dislocation density ρ and the Burgers vector b (b = 2.93 Å for the α phase of Ti-6Al-4V). In order to obtain the FWHM and diffraction angle of every peak, we firstly got the physical shapes of the peaks through multiple peak fitting and the removal of instrument peak shapes, and then obtained these two parameters from the physical peak shapes.…”

Section: Effects Of Magnetic Field On Status Of Dislocationsmentioning

confidence: 99%

Effects of Magnetic Field on the Residual Stress and Structural Defects of Ti-6Al-4V

Zhang

Zhao

Cai

et al. 2020

Metals

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In this work, the influences of a magnetic field of 2.4 T on the macro residual stress and the status of structural defects, including grain boundaries, dislocations and the Fe-rich clusters of Ti-6Al-4V were investigated by X-ray Diffraction (XRD), Electron Backscatter Diffraction (EBSD) and magnetic measurement. The XRD test results show that the applied magnetic field can cause the relaxation and homogenization of macro residual stress. The maps of Kernel Average Misorientation (KAM) values obtained by EBSD tests present a significant dislocation multiplication caused by a magnetic field, and the rise of dislocation density was estimated to be about 32% by XRD tests. The EBSD test results also show an increase in the fraction of Coincidence Site Lattice (CSL) grain boundaries and a decrease in the fraction of low-angle grain boundaries. The results of magnetic measurement show that Ti-6Al-4V has mixed magnetism consisting of paramagnetism and weak ferromagnetism, and that the ferromagnetic saturation magnetization decreased after exposing the alloy to the magnetic field, which suggests the dissolution of the Fe-rich clusters in the alloy. These magnetically-induced changes are related to magnetoplastic effects, a kind of phenomena on which there have been some research, and the possible mechanism of them is discussed in this paper.

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Lattice strain estimation for CoAl2O4 nano particles using Williamson-Hall analysis

Cited by 113 publications

References 29 publications

X-ray diffraction line profile analysis of nanostructured nickel oxide: Shape factor and convolution of crystallite size and microstrain contributions

X-ray diffraction line profile analysis of nanostructured nickel oxide: Shape factor and convolution of crystallite size and microstrain contributions

A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

Effects of Magnetic Field on the Residual Stress and Structural Defects of Ti-6Al-4V

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