Processing-microstructure relationships in Al-Cu alloys produced by the cold spray deposition process

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Date
2018
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University of Alabama Libraries
Abstract

This dissertation investigates the processing-microstructure relationships during cold spray deposition of binary aluminum-copper alloys. While cold spray has been successfully applied using a variety of engineering alloys, systematic investigations that relate powder particle microstructure to spray deposition characteristics and deposited material microstructure have not yet been performed. In this dissertation, the Al-Cu binary alloy will be used as a model system due to its well-known attributes in the physical metallurgy literature and its technological importance as the parent alloys for alloys such as AA2014, AA2024, and AA2219. First, the effect of systematic copper alloy additions (2-5wt% Cu) on the microstructure and properties of the gas atomized, feedstock powders was investigated using electron microscopy, X-ray diffraction, and nanoindentation. Second, the microstructural evolution and texture development during the cold spray process was studied using electron microscopy, and electron backscatter diffraction (EBSD). Third, the impact deformation of individual cold sprayed particles was quantified, and the deformation microstructure in the deposited particles was characterized using focused ion beam, transmission Kikuchi diffraction (TKD), and precession electron diffraction (PED). Lastly, the influence of heat treatment of the feedstock powders on the spray characteristics and microstructure of the cold sprayed material was examined using electron microscopy, and EBSD.

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Electronic Thesis or Dissertation
Keywords
Materials science
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