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dc.contributor.advisorBrewer, Luke N.
dc.contributor.authorMarple, William J.
dc.dateDec-12
dc.date.accessioned2013-02-15T23:13:47Z
dc.date.available2013-02-15T23:13:47Z
dc.date.issued2012-12
dc.identifier.urihttp://hdl.handle.net/10945/27864
dc.descriptionOutstanding Thesisen_US
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractThis thesis presents research on the cold gas-dynamic spray processa relatively new technology that may be utilized to create metal coatings in the solid state. While the thermodynamics and fluid mechanics of the cold gas-dynamic spray process are well understood, the effects of feedstock powder microstructure and composition on the deposition process remain largely unknown. In particular, this thesis aims to shed light on these effects as they pertain to common face-centered cubic metals and their alloysnotably copper and brass. Deposition efficiency, coating thickness per pass, hardness, porosity and compositional variance were all characterized as functions of spraying pressure, spraying temperature and feedstock particle composition in each of the materials. This thesis presents evidence that while brass can be deposited using cold gas-dynamic spray, the resulting material does not possess a dense, uniform microstructure. In fact, deposits made with Cu-90/10 wt.% Zn brass have more than 400% more porosity than standard copper coatings, possess extensive microstructural cracking and wide compositional variance from grain to grain.en_US
dc.description.urihttp://archive.org/details/thecoldgasdynami1094527864
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined
in Title 17, United States Code, Section 101. As such, it is in the
public domain, and under the provisions of Title 17, United States
Code, Section 105, is not copyrighted in the U.S.en_US
dc.titleThe cold gas-dynamic spray and characterization of microcrystalline and nanocrystalline copper alloysen_US
dc.typeThesisen_US
dc.contributor.secondreaderOsswald, Sebastian
dc.contributor.departmentMechanical and Aerospace Engineering (MAE)
dc.subject.authorCold sprayen_US
dc.subject.authorCryomillingen_US
dc.subject.authorNanocrystallineen_US
dc.subject.authorCopperen_US
dc.subject.authorBrassen_US
dc.subject.authorStacking Fault Energyen_US
dc.subject.authorSevere Plastic Deformationen_US
dc.description.recognitionOutstanding Thesisen_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameMechanical Engineer And Master of Science In Mechanical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineMechanical Engineeringen_US


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