Developments in Microcoining Rippled Metal Foils

Randall, Greg; Vecchio, James; Knipping, Jack; Wall, Don; Remington, Tané; Fitzsimmons, P.; Vu, M.; Giraldez, E.; Blue, B. E.; Farrell, Michael; Nikroo, A.

doi:10.13182/fst63-2-274

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…We also plan to perform detailed model/experiment comparisons to determine the viability of Ta and Fe strength models for use in hydrocodes where large plastic strains occur. [1]. The requested rippled pattern was a peak-to-valley (PV) ~ 10 µm and a wavelength (λ) = 50 µm, and each sample was ~3 mm diameter disc shape.…”

Section: Dissemination Of Resultsmentioning

confidence: 99%

“…Tantalum is resistant to oxidation at processing conditions used, however, iron can oxidize in room air or in water. Previous Auger tests on similarly processed iron foils showed an oxidation layer of < 20 nm thick [1].…”

Section: A Metal Disc Raw Materialsmentioning

confidence: 89%

“…Each disc was polished on the intended rippled face down to a thickness of ∼ 990 ± 10 µm using an Allied High Tech MultiPrep System and a polishing procedure similar to that in Randall et al [1], progressing gradually from 600 SiC paper to colloidal silica for Ta and 600 SiC to 3 µm diamond for Fe to obtain low-worked surfaces. Roughness was determined by interferometry (Wyko NT9100, Veeco).…”

Section: B Polishingmentioning

confidence: 99%

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Recovering Large Volumes of Homogeneously Shocked Samples

Stewart¹

2012

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Section: Dissemination Of Resultsmentioning

confidence: 99%

Section: A Metal Disc Raw Materialsmentioning

confidence: 89%

Section: B Polishingmentioning

confidence: 99%

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Recovering Large Volumes of Homogeneously Shocked Samples

Stewart¹

2012

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“…The thickness profile of each foil was determined on a custom‐built dual confocal microscope, which consists of two Keyence LT9010M position sensors placed on either side of the foil suspended over a gap . Central thickness lineouts and maps were created by moving a Newport 460A stage with two Newport actuators (Newport CMA‐12 CCCL) and recording data, all controlled by Labview.…”

Section: Methodsmentioning

confidence: 99%

An Evaporative Initiated Chemical Vapor Deposition Coater for Nanoglue Bonding

et al. 2017

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The authors present an evaporative initiated chemical vapor deposition (iCVD) coater and use it to establish a submicron bonding process for millimeter-scale foils with potentially rough surface features. The coater uses a simple benchtop design suited to research labs, with pre-heated metal pins instead of hot filaments, and direct evaporation of reactants within the chamber. Coatings of poly(glycidyl methacrylate) (pGMA) with thickness 100-800 nm are achieved at rates of 10-40 nm min À1 on substrates common in high energy laser compression experiments. Coating uniformities of 10-30 nm mm À1 are demonstrated in a %60 Â 10 mm zone under the heated pins. As an aside, the authors further show the ability to coat intentionally non-uniform layers in a monomer vapor diffusion gradient. Coatings are formed on both plastics and solids ranging from smooth, non-burred silicon or lithium fluoride to rough and burred metals (aluminum and copper). These coated substrates are then chemically bonded under mild heat and pressure. Detailed surface, thickness, and cross-sectional characterization is performed to confirm a submicron bond gap and to troubleshoot the common clearance issues from burrs, roughness, and surface curvature. Peeling and dropping bond strength tests confirm the bonds are robust, when coated and assembled under conditions to mitigate clearance issues.

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“…The amplitude of both patterns is η 0 = 5 μm. The patterns are diamond turned into steel dies which are used to coin the pattern onto 3 mm diameter tantalum disks [11]. A fiducial is imprinted on each target.…”

Section: Experimental Designmentioning

confidence: 99%

A comparative study of Rayleigh-Taylor and Richtmyer-Meshkov instabilities in 2D and 3D in tantalum

Sternberger¹,

Maddox²,

Opachich³

et al. 2017

AIP Conference Proceedings

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Abstract. Driving a shock wave through the interface between two materials with different densities can result in the RichtmyerMeshkov or Rayleigh-Taylor instability and initial perturbations at the interface will grow. If the shock wave is sufficiently strong, the instability will lead to plastic flow at the interface. Material strength will reduce the amount of plastic flow and suppress growth. While such instabilities have been investigated in 2D, no studies of this phenomena have been performed in 3D on materials with strength.Initial perturbations to seed the hydrodynamic instability were coined into tantalum recovery targets. Two types of perturbations were used, two dimensional (2D) perturbations (hill and valley) and three-dimensional (3D) perturbations (egg crate pattern). The targets were subjected to dynamic loading using the Janus laser at the Jupiter Laser Facility. Shock pressures ranged from 50 GPa up to 150 GPa and were calibrated using VISAR drive targets.

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Developments in Microcoining Rippled Metal Foils

Cited by 10 publications

References 13 publications

Recovering Large Volumes of Homogeneously Shocked Samples

Recovering Large Volumes of Homogeneously Shocked Samples

An Evaporative Initiated Chemical Vapor Deposition Coater for Nanoglue Bonding

A comparative study of Rayleigh-Taylor and Richtmyer-Meshkov instabilities in 2D and 3D in tantalum

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