Phase transformations during rapid heating of Al/Ni multilayer foils

Trenkle, Jonathan C.; Koerner, Lucas J.; Täte, Mark W.; Grüner, Sol M.; Weihs, Timothy P.; Hufnagel, T. C.

doi:10.1063/1.2975830

Cited by 108 publications

(85 citation statements)

References 19 publications

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“…The application of a localized source of heat initiates mixing and energy release that creates a selfpropagating reaction front that propagates throughout the material, releasing heat to the surroundings. RMLF have found application in material joining and other localized heat source applications [43][44][45][46][47][48]. One typical system that is used is alternating layers of Al and Ni that when heated will mix and form an intermetallic phase(s) that depends on the overall atomic composition.…”

Section: Reactive Multilayer Foilsmentioning

confidence: 99%

Quantifying transient states in materials with the dynamic transmission electron microscope

Campbell

LaGrange

Kim

et al. 2010

Journal of Electron Microscopy

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(250 words)The Dynamic Transmission Electron Microscope (DTEM) offers a means of capturing rapid evolution in a specimen through in-situ microscopy experiments by allowing 15 ns electron micrograph exposure times. The rapid exposure time is enabled by creating a burst of electrons at the emitter by ultraviolet pulsed laser illumination. This burst arrives a specified time after a second laser initiates the specimen reaction. The timing of the two Q-switched lasers is controlled by highspeed pulse generators with a timing error much less than the pulse duration. Both diffraction and imaging experiments can be performed, just as in a conventional TEM. The brightness of the emitter and the total current control the spatial and temporal resolutions. We have demonstrated 7 nm spatial resolution in single 15 ns pulsed images. These single-pulse imaging experiments have been used to study martensitic transformations, nucleation and crystallization of an amorphous metal, and rapid chemical reactions. Measurements have been performed on these systems that are possible by no other experimental approaches currently available.2

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Section: Reactive Multilayer Foilsmentioning

confidence: 99%

Quantifying transient states in materials with the dynamic transmission electron microscope

Campbell

LaGrange

Kim

et al. 2010

Journal of Electron Microscopy

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“…Numerous experimental investigations have focused on the self-propagating nature of intermetallic formation reactions and associated phase transformations. 2,[10][11][12] The large amount of localized heat due to exothermic mixing in the multilayers has also motivated a number of practical applications, such as welding, brazing, and soldering. [13][14][15][16][17][18][19][20] Recently, Joress et al 21 conducted experiments on Zr-Al nanolaminate foils with varying compositions and microstructures and focused on investigating the oxidation properties of the nanolaminate following the completion of the anaerobic reaction.…”

Section: Introductionmentioning

confidence: 99%

Development of a reduced model of formation reactions in Zr-Al nanolaminates

Vohra

Winokur

Overdeep

et al. 2014

Journal of Applied Physics

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A computational model of anaerobic reactions in metallic multilayered systems with an equimolar composition of zirconium and aluminum is developed. The reduced reaction formalism of M. Salloum and O. M. Knio, Combust. Flame 157(2): 288–295 (2010) is adopted. Attention is focused on quantifying intermixing rates based on experimental measurements of uniform ignition as well as measurements of self-propagating front velocities. Estimates of atomic diffusivity are first obtained based on a regression analysis. A more elaborate Bayesian inference formalism is then applied in order to assess the impact of uncertainties in the measurements, potential discrepancies between predictions and observations, as well as the sensitivity of predictions to inferred parameters. Intermixing rates are correlated in terms of a composite Arrhenius law, which exhibits a discontinuity around the Al melting temperature. Analysis of the predictions indicates that Arrhenius parameters inferred for the low-temperature branch lie within a tight range, whereas the parameters of the high-temperature branch are characterized by higher uncertainty. The latter is affected by scatter in the experimental measurements, and the limited range of bilayers where observations are available. For both branches, the predictions exhibit higher sensitivity to the activation energy than the pre-exponent, whose posteriors are highly correlated.

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“…Aside from multi-layer physical or chemical vapor deposition [13][14][15][16][17], these methods generally involve some sort of a carrier fluid to combine, intermix, and transport the reagent materials to the deposition substrate. Wide ranging methods are available to control the morphology and fuel-oxidizer intimacy of the particles in the films such as self-assembly [18], aerogel, sol-gel based, or aerosol spray pyrolysis [19,20], and core-shell encapsulation [21,22].…”

Section: Introductionmentioning

confidence: 99%

Physiochemical Characterization of Iodine (V) Oxide Part II: Morphology and Crystal Structure of Particulate Films

2015

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Abstract:In this study, the production of particulate films of iodine (V) oxides is investigated. The influence that sonication and solvation of suspended particles in various alcohol/ketone/ester solvents have on the physical structure of spin or drop cast films is examined in detail with electron microscopy, powder x-ray diffraction, and UV-visible absorption spectroscopy. Results indicate that sonicating iodine oxides in alcohol mixtures containing trace amounts of water decreases deposited particle sizes and produces a more uniform film morphology. UV-visible spectra of the pre-cast suspensions reveal that for some solvents, the iodine oxide oxidizes the solvent, producing I2 and lowering the pH of the suspension. Characterizing the crystals within the cast films reveal their composition to be primarily HI3O8, their orientations to exhibit a preferential orientation, and their growth to be primarily along the ac-plane of the crystal, enhanced at higher spin rates. Spin-coating at lower spin rates produces laminate-like particulate films versus higher density, one-piece films of stacked particles produced by drop casting. The particle morphology in these films consists of a combination of rods, plates, cubes, and rhombohedra structure.

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Phase transformations during rapid heating of Al/Ni multilayer foils

Cited by 108 publications

References 19 publications

Quantifying transient states in materials with the dynamic transmission electron microscope

Quantifying transient states in materials with the dynamic transmission electron microscope

Development of a reduced model of formation reactions in Zr-Al nanolaminates

Physiochemical Characterization of Iodine (V) Oxide Part II: Morphology and Crystal Structure of Particulate Films

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