A theory for the shock-wave consolidation of powders

Schwarz, R. B.; Kasiraj, P.; Vreeland, T.; Ahrens, Thomas J.

doi:10.1016/0001-6160(84)90131-7

Cited by 128 publications

(16 citation statements)

References 12 publications

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“…(c) M e l t i n g : It is known that energy is preferentially deposited at the particle surface, leading eventually to their melting. This is the main component of Schwarz et al [5]'s model. (d) Defect energy: Point, line, and interfacial defects are produced by the passage of the shock wave.…”

Section: Analytical Computation Of Energy Requirements In Shock Consomentioning

confidence: 93%

“…Models that predict the pressure required for consolidation of "soft" materials, based exclusively on the melting of particle surfaces, have ben proposed by Gourdin [4] and Schwarz et al [5]. For "hard" materials the plastic deformation requires a non-negligible energy, and models have been developed and applied to real materials by Nesterenko [6], Ferreira and Meyers [7], and Potter and Ahrens [8].…”

Section: Introductionmentioning

confidence: 99%

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Microstructurally-based analysis and computational modeling of shock consolidation

1994

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Abstract:The most important microstructural processes involved in shock consolidation are identified and illustrated for a nickel-based superalloy and silicon carbide. Interparticle melting, vorticity, voids, and particle fracture are observed. Various energy dissipation processes are identified and analyzed: plastic deformation, interparticle friction, microkmetic energy, defect generation. An analytical expression is proposed for the energy requirement to shock consolidate a powder as a function of strength, size, porosity, and temperature, based on a prescribed interparticle melting layer. These analytical results are compared to numerical solutions obtained by modeling the compaction of a discrete set of particles with an Eulerian finite element program. Based on the Analysis and computations, the inherent limitations of shock consolidation are identified and discussed.

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Section: Analytical Computation Of Energy Requirements In Shock Consomentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Microstructurally-based analysis and computational modeling of shock consolidation

1994

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“…Previously [5], we have modeled the shock consolidation process as one in which a thin film of melt is produced by possibly grain boundary sliding during shock compaction at the shock g ent. A m'nimum shock pressure required for compaction, as defined by the level of ultimate tensile strength can correspond to several microscopic processes including:…”

Section: Thforymentioning

confidence: 99%

Shock Compaction of Molybdenum Powder

Ahrens

Kostka

Vreeland

et al. 1984

Shock Waves in Condensed Matter 1983

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“…[1][2][3][4][5][6][7][8][9] For example, it allows consolidation of powders through rapid, localized energy deposition around the pores with less heating of the bulk materials, 9 thus preserving some desired material properties. Experimental and simulation/modeling efforts have been dedicated to shock consolidation for practical applications and for understanding the mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Shock-induced consolidation and spallation of Cu nanopowders

Han

et al. 2012

Journal of Applied Physics

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Formation of an extended CoSi2 thin nanohexagons array coherently buried in silicon single crystal Appl. Phys. Lett. 100, 063116 (2012) Magnetic behaviour of Ni0.4Zn0.6Co0.1Fe1.9O4 spinel nano-ferrite J. Appl. Phys. 111, 07A305 (2012) Fabrication of Fe@mSiO2 nanowires with large remanence and low cytotoxicity for targeted drug delivery J. Appl. Phys. 111, 07B302 (2012) Fabrication of nanoscale glass fibers by electrospinning Appl. Phys. Lett. 100, 063114 (2012) ZnO/Si arrays decorated by Au nanoparticles for surface-enhanced Raman scattering study J. Appl. Phys. 111, 033104 (2012) Additional information on J. Appl. Phys. A useful synthesis technique, shock synthesis of bulk nanomaterials from nanopowders, is explored here with molecular dynamics simulations. We choose nanoporous Cu ($11 nm in grain size and 6% porosity) as a representative system, and perform consolidation and spallation simulations. The spallation simulations characterize the consolidated nanopowders in terms of spall strength and damage mechanisms. The impactor is full density Cu, and the impact velocity (u i ) ranges from 0.2 to 2 km s À1 . We present detailed analysis of consolidation and spallation processes, including atomic-level structure and wave propagation features. The critical values of u i are identified for the onset plasticity at the contact points (0.2 km s À1 ) and complete void collapse (0.5 km s À1 ). Void collapse involves dislocations, lattice rotation, shearing/friction, heating, and microkinetic energy. Plasticity initiated at the contact points and its propagation play a key role in void collapse at low u i , while the pronounced, grain-wise deformation may contribute as well at high u i . The grain structure gives rise to nonplanar shock response at nanometer scales. Bulk nanomaterials from ultrafine nanopowders ($10 nm) can be synthesized with shock waves. For spallation, grain boundary (GB) or GB triple junction damage prevails, while we also observe intragranular voids as a result of GB plasticity.

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A theory for the shock-wave consolidation of powders

Cited by 128 publications

References 12 publications

Microstructurally-based analysis and computational modeling of shock consolidation

Microstructurally-based analysis and computational modeling of shock consolidation

Shock Compaction of Molybdenum Powder

Shock-induced consolidation and spallation of Cu nanopowders

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