Grain-size-dependent non-monotonic lattice parameter variation in nanocrystalline W: The role of non-equilibrium grain boundary structure

Srivastav, Ajeet K.; Chawake, Niraj; Murty, B.S.

doi:10.1016/j.scriptamat.2014.11.005

Cited by 41 publications

(19 citation statements)

References 34 publications

(50 reference statements)

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“…The interfacial stress can be quantitatively calculated in term of GB interfacial energy [49]. The GB interfacial energy of the ball-milled powders is associated with the GB interfacial energy of un-milled powder and the excess GB interfacial energy [22]. The excess GB interfacial energy (

γ_{gb}^{Excess}

) can be calculated using the model proposed by Nazarov et al [50] as follows:

γ_{gb}^{Excess} = \frac{{Gb}^{2} sans-serifρ normald}{12 sans-serifπ (1 - sans-serifν)} \ln (\frac{d}{b})

where G is the shear modulus (79.16 GPa for Fe–10Cr–3Al), b is the Burgers vector, ρ is the dislocation density, d is the crystallite size, and ν is Poisson’s ratio.…”

Section: Resultsmentioning

confidence: 99%

“…The excess GB interfacial energy (

γ_{gb}^{Excess}

) can be calculated using the model proposed by Nazarov et al [50] as follows:

γ_{gb}^{Excess} = \frac{{Gb}^{2} sans-serifρ normald}{12 sans-serifπ (1 - sans-serifν)} \ln (\frac{d}{b})

where G is the shear modulus (79.16 GPa for Fe–10Cr–3Al), b is the Burgers vector, ρ is the dislocation density, d is the crystallite size, and ν is Poisson’s ratio. The excess GB interfacial energy varies non-monotonically with a decrease in the crystallite size during milling of pure metal and correspondingly, the interfacial stress follows a similar trend during milling [22]. However, the excess GB interfacial energy decreases monotonically with crystallite size in the case of Fe-alloy [27].…”

Section: Resultsmentioning

confidence: 99%

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Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe–10Cr–3Al Powder

et al. 2017

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Structural changes during the deformation-induced synthesis of nanocrystalline Fe–10Cr–3Al alloy powder via high-energy ball milling followed by annealing and rapid consolidation by spark plasma sintering were investigated. Reduction in crystallite size was observed during the synthesis, which was associated with the lattice expansion and rise in dislocation density, reflecting the generation of the excess grain boundary interfacial energy and the excess free volume. Subsequent annealing led to the exponential growth of the crystallites with a concomitant drop in the dislocation density. The rapid consolidation of the as-synthesized nanocrystalline alloy powder by the spark plasma sintering, on the other hand, showed only a limited grain growth due to the reduction of processing time for the consolidation by about 95% when compared to annealing at the same temperature.

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γ_{gb}^{Excess}

) can be calculated using the model proposed by Nazarov et al [50] as follows:

γ_{gb}^{Excess} = \frac{{Gb}^{2} sans-serifρ normald}{12 sans-serifπ (1 - sans-serifν)} \ln (\frac{d}{b})

where G is the shear modulus (79.16 GPa for Fe–10Cr–3Al), b is the Burgers vector, ρ is the dislocation density, d is the crystallite size, and ν is Poisson’s ratio.…”

Section: Resultsmentioning

confidence: 99%

“…The excess GB interfacial energy (

γ_{gb}^{Excess}

) can be calculated using the model proposed by Nazarov et al [50] as follows:

γ_{gb}^{Excess} = \frac{{Gb}^{2} sans-serifρ normald}{12 sans-serifπ (1 - sans-serifν)} \ln (\frac{d}{b})

Section: Resultsmentioning

confidence: 99%

Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe–10Cr–3Al Powder

et al. 2017

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“…Hence, Ta becomes a Ta-rich solid solution in the course of milling and further processing [43]. In addition, grain-boundary interfacial stresses accompanied by the evolution of reduced crystallite size and non-equilibrium grain boundaries [26], should result in the lower lattice parameter of W as calculated and discussed above. Fig.2(a) shows the shrinkage (%) and shrinkage rate (%/min) during non-isothermal sintering of the nanocrystalline W-5wt.%Ta alloy powder.…”

Section: Resultsmentioning

confidence: 86%

Microstructure evolution and densification during spark plasma sintering of nanocrystalline W-5wt.%Ta alloy

Srivastav

Bandi

Kumar

et al. 2020

Philosophical Magazine Letters

Self Cite

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The present work reports the effect of Ta on densification and microstructure evolution during non-isothermal and spark plasma sintering of nanocrystalline W. Nanocrystalline W-5wt.%Ta alloy powder was synthesised using mechanical alloying. The nanocrystalline powder was characterised thoroughly using X-ray diffraction line profile analysis. Furthermore, the shrinkage behaviour of nanocrystalline powder was investigated during non-isothermal sintering using dilatometry. Subsequently, the alloy powder was consolidated using spark plasma sintering up to 1600°C. The role of Ta on stabilising the microstructure during spark plasma sintering of nanocrystalline W was investigated in detail using electron backscatter diffraction. The average grain size of spark plasma sintered W-5wt.%Ta alloy was observed as 1.73 1  µm.

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“…The temperature and expansion of the lattice decreased the grain size as reported earlier. [27][28][29][30][31][32][33][34][35][36] The lattice parameters were calculated using the following equations. 37,38 The lattice parameter values are tabulated in Table 1.…”

Section: Results and Discussion Powder X-ray Diffractionmentioning

confidence: 99%

Structural and magnetic properties of cobalt-doped iron oxide nanoparticles prepared by solution combustion method for biomedical applications

Kaliyamoorthy¹,

Babu²,

Bai³

et al. 2015

IJN

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Cobalt-doped iron oxide nanoparticles were prepared by solution combustion technique. The structural and magnetic properties of the prepared samples were also investigated. The average crystallite size of cobalt ferrite (CoFe2O4) magnetic nanoparticle was calculated using Scherrer equation, and it was found to be 16±5 nm. The particle size was measured by transmission electron microscope. This value was found to match with the crystallite size calculated by Scherrer equation corresponding to the prominent intensity peak (311) of X-ray diffraction. The high-resolution transmission electron microscope image shows clear lattice fringes and high crystallinity of cobalt ferrite magnetic nanoparticles. The synthesized magnetic nanoparticles exhibited the saturation magnetization value of 47 emu/g and coercivity of 947 Oe. The anti-microbial activity of cobalt ferrite nanoparticles showed better results as an anti-bacterial agent. The affinity constant was determined for the nanoparticles, and the cytotoxicity studies were conducted for the cobalt ferrite nanoparticles at different concentrations and the results are discussed.

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Grain-size-dependent non-monotonic lattice parameter variation in nanocrystalline W: The role of non-equilibrium grain boundary structure

Cited by 41 publications

References 34 publications

Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe–10Cr–3Al Powder

Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe–10Cr–3Al Powder

Microstructure evolution and densification during spark plasma sintering of nanocrystalline W-5wt.%Ta alloy

Structural and magnetic properties of cobalt-doped iron oxide nanoparticles prepared by solution combustion method for biomedical applications

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