Processing-microstructure-property relations in high pressure cold spray of AA2024 and AA7075

Simple item page
dc.contributorWeaver, Mark Lovell
dc.contributorThompson, Gregory B.
dc.contributorGenau, Amber
dc.contributorJordon, J. Brian
dc.contributor.advisorBrewer, Luke N.
dc.contributor.authorStory, William Andrew
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2019-02-12T14:31:51Z
dc.date.available2019-02-12T14:31:51Z
dc.date.issued2018
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractIn this dissertation work, the processing-microstructure-property relations are examined for cold spray deposited AA2024 and AA7075. Unlike traditional thermal spray technologies, powders are never melted during the cold spray process. This approach allows for heat-sensitive materials such as 2000 and 7000 series aluminum alloys to be used for repair of components damaged by corrosion or fatigue. While a small body of literature for cold spray of AA7075 and AA2024 exists, further understanding on processing-microstructure relationships is needed and improvements to deposition characteristics, microstructure and mechanical properties are necessary for successful application. This dissertation examines four aspects of the cold spray process applied to AA2024 and AA7075. First the effects of processing parameters on process efficiency, deposit microstructure, and deposit properties of AA2024 and AA7075 are examined. Spraying with helium is found to be more cost effective than nitrogen or any mixture of nitrogen and helium and generally results in higher quality deposits. A novel heat treatment method is developed to solution heat treat gas-atomized AA2024 and AA7075 powders prior to deposition. This approach is found to significantly improve deposition efficiency of powders and homogenize the deposit microstructure by solutionization of segregated solute. The influence of the deposit geometry on the development of residual stresses are investigated for AA2024 and AA7075 using neutron diffraction. Generally compressive residual stresses are found in deposits and deposit geometry is found to significantly effect to magnitude of residual stresses evolved. Finally, the effects of heating the substrate/deposit using an in situ laser during deposition are assessed. Laser assisted cold spray is found to improve deposition efficiency and improving ductility of AA7075 deposits but can result in significant heat damage to the substrate material.en_US
dc.format.extent209 p.
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otheru0015_0000001_0003241
dc.identifier.otherStory_alatus_0004D_13659
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5424
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectMaterials science
dc.titleProcessing-microstructure-property relations in high pressure cold spray of AA2024 and AA7075en_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Metallurgical and Materials Engineering
etdms.degree.disciplineMetallurgical/Materials Engineering
etdms.degree.grantorThe University of Alabama
etdms.degree.leveldoctoral
etdms.degree.namePh.D.
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
file_1.pdf
Size:
10.27 MB
Format:
Adobe Portable Document Format
Download
Collections
Theses and Dissertations
Theses and Dissertations - Department of Metallurgical and Materials Engineering