Mesoscale simulation of the configuration-dependent shock-compression response of Ni+Al powder mixtures

Eakins, Daniel E.; Thadhani, Naresh N.

doi:10.1016/j.actamat.2007.12.009

Cited by 53 publications

(34 citation statements)

References 29 publications

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“…As mentioned previously, mixing and reaction in the micrometre-scale, spherical Ni+Al mixture is suppressed due to the limited deformation of the harder, denser nickel phase. 126,127 This preferentialism is caused by the large differences in properties between the two components, such as density, sound speed, and yield strength. The results of experiments performed on the flake-Ni and equiaxed-Al mixture indicates that there is also an effect of particle morphology.…”

Section: Design and Control Of Shock-induced Reactionsmentioning

confidence: 99%

“…Meso-scale simulations on imported microstructures have revealed the unique deformation modes contributing to reaction initiation in a particular morphology of Ni+Al powders. 127 Through the coupling of experimental, theoretical, and numerical work, it has become clear that the response of reactive powders to shock-compression is not easily generalised for all powder systems.…”

Section: Summary and Concluding Remarksmentioning

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: Design and Control Of Shock-induced Reactionsmentioning

confidence: 99%

Section: Summary and Concluding Remarksmentioning

confidence: 99%

Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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“…The high exothermic energy release inherent in the reaction pathways of the Ti/B system in particular is postulated to promote combustion in Al powders by enhancing localization phenomena and mixing in powder compacts. The reactive behavior in these systems under shock loading or high strain rates depends largely on extrinsic properties such as microstructural distribution and constituent size/morphology, as well as intrinsic physical properties such as particle hardness and surface reactivity [1,2,3,4,5]. The crucial elements necessary for impact-induced reaction initiation in heterogeneous systems however remain unknown.…”

Section: Introductionmentioning

confidence: 99%

Meso-scale simulations of strain-induced reaction mechanisms in Ti/Al/B heterogeneous systems

Gonzales¹,

Gurumurthy²,

Gokhale³

et al. 2012

AIP Conference Proceedings

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“…Evidence for initiation at this timescale has previously relied upon continuum scale measurements, raising questions as to the specific micro and meso scale processes involved. The involvement of mechanical deformation and more specifically interparticle shear in driving mass mixing has been suggested as a possible explanation for the rapid initiation of these intermetallic reactions [2,3].…”

Section: Introductionmentioning

confidence: 99%

Towards the role of interfacial shear in shock-induced intermetallic reactions

Collinson

Chapman

Burchell

et al. 2012

AIP Conference Proceedings

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Abstract. Shock-induced intermetallic reactions have previously been shown to occur on a nanosecond timescale, with the role of mass mixing processes driven by inter-facial shear at material interfaces suggested as a possible explanation. Experimental setups allowing the role of friction on these mechanisms to be considered are presented. Simulations show that the use of an impedance mismatch, shock driven experimental setup should allow sliding velocities of 50 -100 m s −1 to be attained with mechanical mixing the main reaction mechanism. A second setup utilising the oblique impact of small spherical projectiles upon a target plate is predicted to enable much higher sliding velocities of up to 2 Km s −1 to be attained with thermally driven diffusion reaction mechanisms becoming dominant.

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Mesoscale simulation of the configuration-dependent shock-compression response of Ni+Al powder mixtures

Cited by 53 publications

References 29 publications

Shock compression of reactive powder mixtures

Shock compression of reactive powder mixtures

Meso-scale simulations of strain-induced reaction mechanisms in Ti/Al/B heterogeneous systems

Towards the role of interfacial shear in shock-induced intermetallic reactions

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