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Developments in Microcoining Rippled Metal Foils

Greg C. Randall, James Vecchio, Jack Knipping, Don Wall, Tane Remington, Paul Fitzsimmons, Matthew Vu, Emilio M. Giraldez, Brent E. Blue, Michael Farrell, Abbas Nikroo

Fusion Science and Technology / Volume 63 / Number 2 / March-April 2013 / Pages 274-281

Technical Paper / Selected papers from 20th Target Fabrication Meeting, May 20-24, 2012, Santa Fe, NM, Guest Editor: Robert C. Cook /

Rippled metal foils are currently sought for high-strain-rate material strength studies at laser facilities. Because these metals typically cannot be diamond turned, we employ a microcoining process to imprint the [approximately]5-m-deep by [approximately]50-m-long ripples into the metal surface. This work details recent process developments to fabricate these rippled metal targets, specifically for iron and tantalum. The process consists of nitriding a steel die, diamond turning the die, and then pressing the die into a polished metal foil of choice. We show: advantages of deeper-nitrided dies, improved foil thickness uniformity and characterization, variation in coining stress over different materials, pattern quality characterization, bowing reduction, and patterning of multimode ripples.

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