Abstract No.:	1105
Scheduled at:	Wednesday, June 04, 2008, Auditorium 2 9:00 AM Cold Spraying 1 Everything around this young thermal spraying technique, possible applications and latest developments for equipment of high pressure and low pressure cold spraying, models and simulations for a deeper process knowledge
Title:	Preparation and mechanical properties of cold sprayed nanocrystalline aluminum
Authors:	Aaron Hall* / Sandia National Laboratories, USA Luke Brewer / Sandia National Laboratories, USA Brad Boyce/ Sandia National Laboratories, USA Timothy Roemer/ Ktech Corporation, USA
Abstract:	Nanostructured materials are of widespread interest because of the unique properties they offer. We have demonstrated that nanocrystalline 6061 and 5083 aluminum powders, prepared using LN2 ball milling, can be consolidated using the cold spray process. TEM analysis of the cold spray coatings reveals that the cold spray process caused significant grain refinement. Air atomized 6061 and 5083 aluminum powders were ball milled in liquid nitrogen resulting in a powder microstructure containing 250-400 nm grains. Cold spray coatings prepared with these feed stock materials exhibited homogenous microstructures with grain sizes of 30-50 nm. TEM analysis of the as-received powders, ball milled powders, and coatings are shown. Mechanical property measurements made using nano-indentation techniques are also discussed. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy?s National Nuclear Security Administration under contract DE-AC04-94AL85000.

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