Toward design of the pre-stressed nano- and microscale aluminum particles covered by oxide shell

Levitas, Valery I.; Dikici, Birce; Pantoya, Michelle L.

doi:10.1016/j.combustflame.2010.12.002

Cited by 27 publications

(37 citation statements)

References 17 publications

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“…They are important for the development and understanding of the melt-dispersion mechanism of reaction of aluminum nanoparticles. [11][12][13] Our analytical study revealed that liquid can withstand, without fracture, dynamic pressure that significantly exceeds the liquid strength and that damage does not localize in some cases; numerical results confirm these findings.…”

Section: Introductionsupporting

confidence: 75%

“…3-9. In various applications at the nanoscale (e.g., for cavitation in rarefaction waves during laser ablation 10 or in Al nanoparticles after dynamic oxide shell fracture [11][12][13] ), it is desirable to model nucleation and growth of individual bubbles without any assumptions about nucleation places, bubble shapes, and their evolution. Note that metallic nanoparticles (e.g., nickel and aluminum) can withstand tensile pressure of several GPa during tens of picoseconds.…”

Section: Introductionmentioning

confidence: 99%

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Phase-field modeling of fracture in liquid

Levitas

Idesman

Palakala

2011

Journal of Applied Physics

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Phase-field theory for the description of the overdriven fracture in liquid (cavitation) in tensile pressure wave is developed. Various results from solid mechanics are transferred into mechanics of fluids. Thermodynamic potential is formulated that describes the desired tensile pressure-volumetric strain curve and for which the infinitesimal damage produces infinitesimal change in the equilibrium bulk modulus. It is shown that the gradient of the order parameter should not be included in the energy, in contrast to all known phase-field approaches for any material instability. Analytical analysis of the equations is performed. Problems relevant to the melt-dispersion mechanism of the reaction of nanoparticles on cavitation in spherical and ellipsoidal nanoparticles with different aspect ratios, after compressive pressure at its surface sharply dropped, are solved using finite element method. Some nontrivial features (lack of fracture at dynamic pressure much larger than the liquid strength and lack of localized damage for some cases) are obtained analytically and numerically. Equations are formulated for fracture in viscous liquid. A similar approach can be applied to fracture in amorphous and crystalline solids. Phase-field theory for the description of the overdriven fracture in liquid (cavitation) in tensile pressure wave is developed. Various results from solid mechanics are transferred into mechanics of fluids. Thermodynamic potential is formulated that describes the desired tensile pressure-volumetric strain curve and for which the infinitesimal damage produces infinitesimal change in the equilibrium bulk modulus. It is shown that the gradient of the order parameter should not be included in the energy, in contrast to all known phase-field approaches for any material instability. Analytical analysis of the equations is performed. Problems relevant to the melt-dispersion mechanism of the reaction of nanoparticles on cavitation in spherical and ellipsoidal nanoparticles with different aspect ratios, after compressive pressure at its surface sharply dropped, are solved using finite element method. Some nontrivial features (lack of fracture at dynamic pressure much larger than the liquid strength and lack of localized damage for some cases) are obtained analytically and numerically. Equations are formulated for fracture in viscous liquid. A similar approach can be applied to fracture in amorphous and crystalline solids.

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Section: Introductionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Phase-field modeling of fracture in liquid

Levitas

Idesman

Palakala

2011

Journal of Applied Physics

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“…With such an approach for pre-stressing, the temperature T0 was increased to different values in the range 378-473 K, which indeed increased flame speed for Al nano-and micron-scale particles by 30-40%, in quantitative agreement with theoretical predictions [13,14].…”

Section: Introductionsupporting

confidence: 67%

“…Figure 1 illustrates a typical powder filled tube arrangement for measuring flame speed as well as representative still frame images of flame propagation. The apparatus and procedure are described in more detail elsewhere [13,14,16,19] …”

Section: Ii2 Strain Measurementsmentioning

confidence: 99%

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Stress relaxation in pre-stressed aluminum core–shell particles: X-ray diffraction study, modeling, and improved reactivity

Levitas

McCollum

Pantoya

et al. 2016

Combustion and Flame

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Stress relaxation in pre-stressed aluminum core-shell particles: X-ray diffraction study, modeling, and improved reactivity AbstractStress relaxation in aluminum micron-scale particles covered by alumina shell after pre-stressing by thermal treatment and storage was measured using x-ray diffraction with synchrotron radiation. Pre-stressing was produced by annealing Al particles at 573 K followed by fast cooling. While averaged dilatational strain in Al core was negligible for untreated particles, it was measured at 4.40×10 -5 and 2.85×10 -5 after 2 and 48 days of storage. Consistently, such a treatment lead to increase in flame propagation speed for Al+CuO mixture by 37% and 25%, respectively. Analytical model for creep in alumna shell and stress relaxation in Al core-alumina shell structure is developed and activation energy and pre-exponential multiplier are estimated.The effect of storage temperature and annealing temperature on the kinetics of stress relaxation

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Toward design of the pre-stressed nano- and microscale aluminum particles covered by oxide shell

Cited by 27 publications

References 17 publications

Phase-field modeling of fracture in liquid

Phase-field modeling of fracture in liquid

Stress relaxation in pre-stressed aluminum core–shell particles: X-ray diffraction study, modeling, and improved reactivity

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