Shock synthesis and synthesis-assisted shock consolidation of suicides

Yu, Li-Hsing; Meyers, Marc A.

doi:10.1007/bf00588294

Cited by 41 publications

(16 citation statements)

References 14 publications

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“…By assuming the product to be SnS, and from the measured shift in Hugoniot data, Batsanov et al 35 estimated the degree of product formation to be ~27%. A similar analysis was performed later by Yu and Meyers, 87 as described in Fig. 14, albeit, based on results of shock recovery experiments performed on Nb+Si powder mixtures.…”

Section: Thermodynamic Models For Shock-induced Reactionsmentioning

confidence: 75%

“…It is revealing to note that the systems reported to undergo shock-induced chemical reaction, e.g., Ni+Ti; Ti+Si; Nb+Si; and Ni+Si (shown centre-filled), are clustered near the origin, where the impedance and yield strength differences are least. 33,36,38,39,87,100 On the other hand, those systems that remain inert, Ni+Al; Mo+Si; Ti+Al (shown centre-crossed), are far removed from the origin, and are associated with large differences in intrinsic properties. 85,92,103,132 From the distribution of data, it appears that shock-induced reaction will be suppressed above impedance and strength differences of ~175% and ~200%, respectively.…”

Section: Fig 41mentioning

confidence: 99%

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Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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The shock-compression of reactive powder mixtures can yield varied chemical behaviour with occurrence of mechanochemical reactions in the time-scale of the high-pressure state, or thermochemical reactions in the time-scale of temperature equilibration, or simply the creation of densepacked highly reactive state of material. The principal challenge has been to understand the processes that distinguish between mechanochemical (shock-induced) and thermochemical (shock-assisted) reactions, which has broad implications for the synthesis of novel metastable or non-equilibrium materials, or the design of highly configurable next-generation energetic materials. In this paper, the process of shock-compression in reactive powder mixtures and the associated role of various intrinsic and extrinsic characteristics of reactants in the triggering of ultra-fast "shock-induced" chemical reactions are discussed. Experimental techniques employing time-resolved diagnostics, and results, that identify the occurrence of shock-induced reactions are reviewed. Conceptual and numerical models used to describe the heterogeneous nature of such reactions through mesoscopic details of shock-compression are presented. Finally, a discussion of the application of recent results for the design of reactive material systems with controlled reaction initiation and energy release characteristics is provided.

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Section: Thermodynamic Models For Shock-induced Reactionsmentioning

confidence: 75%

Section: Fig 41mentioning

confidence: 99%

Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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“…This initial discovery was followed by activity in Japan [2,3] and the USSR [4][5][6][7][8]. In the U.S., the pioneering work of Graham and co-workers [9][10][11] was followed by investigations by Vreeland and co-workers [12,13], Horie et al [14,15], Boslough [16], Thadhani and co-workers [17,18], and Yu et al [19,20].…”

Section: Introductionmentioning

confidence: 99%

Shock synthesis of silicides—I. experimentation and microstructural evolution

Vecchio

Meyers

1994

Acta Metallurgica et Materialia

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Abstract--Niobium and molybdenum silicides were synthesized by the passage of high-amplitude shock waves through elemental powder mixtures. These shock waves were generated by planar parallel impact of explosively-accelerated flyer plates on momentum-trapped capsules containing the powders. Recovery of the specimens revealed unreacted, partially-reacted, and fully-reacted regions, in accord with shock energy levels experienced by the powder. Electron microscopy was employed to characterize the partiallyand fully-reacted regions for the Mo-Si and Nb-Si systems, and revealed only equilibrium phases. Selected-area and convergent beam electron diffraction combined with X-ray microanalysis verified the crystal structure and compositions of the reacted products. Diffusion couples between Nb and Si were fabricated for the purpose of measuring static diffusion rates and determining the phases produced under non-shock condition. Comparison of these non-shock diffusion results with the shock synthesis results indicates that a new mechanism is responsible for the production of the NbSi2 and MoSi2 phases under shock compression. At the local level the reaction can be rationalized, for example, in the Nb-Si system under shock compression, through the production of a liquid-phase reaction product (NbSi2) at the Nb-particle/Si-liquid interface, the formation of spherical nodules (~2/zm diameter) of this product through interfacial tension, and their subsequent solidification.

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“…The first of these categories is "shock assisted chemical reactions" (Thadhani 1993) which seem to benefit from the shock wave environment in powder mixtures (removal of diffusion barriers, mass mixing, and elevated temperature), but mainly occur after the high pressure pulse has relaxed. These "assisted reactions" seem to be dominated by thermally controlled reaction mechanisms such as mass diffusion (Krueger et al 1992, Yu andMeyers 1991). The second category is "ultrafast chemical reactions" (Batsanov et al 1987, Boslough 1990, Bennett et al 1993, Graham et al 1993) which seem to benefit from the thermal effects of the shock wave, but are primarily driven by the mechanical effects (heavy plastic deformation, turbulent mixing, and interparticle shear).…”

Section: Introductionmentioning

confidence: 99%

“…Since this early model, more complex models have been developed by Song and Thadhani (1992), Yu and Meyers (1991), and Boslough (1990) that include changes in i) specific internal energy, ii) specific volume due to the chemical reaction, and iii) the equations of state describing the reactants and products. These three effects are considered in reference to a curve describing the shock response of dense reactant or product materials.…”

Section: Introductionmentioning

confidence: 99%

Shock-induced inorganic reactions and condensed phase detonations

Bennett

Horie

1994

Shock Waves

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Abstract. Existing hugoniot calculations of inorganic chemical reactions in powder mixtures are found to contain errors and ambiguities. Most of the problems were caused by improper identification of the thermodynamic reference state. The derivations have been revised using two different integration paths: i) constant volume, and ii) constant pressure. Sample calculations with a Ni-A1 system show that the two schemes yield close results. The constant pressure scheme presents the possibility of self-sustained chemical reactions (detonations) occurring in condensed phase. An example of such a detonation in the Ni-A1 system is numerically demonstrated with hydrocode calculations.

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Shock synthesis and synthesis-assisted shock consolidation of suicides

Cited by 41 publications

References 14 publications

Shock compression of reactive powder mixtures

Shock compression of reactive powder mixtures

Shock synthesis of silicides—I. experimentation and microstructural evolution

Shock-induced inorganic reactions and condensed phase detonations

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