Title page for ETD etd-01262006-162731


Type of Document Master's Thesis
Author Maisano, Adam J.
Author's Email Address amaisano@vt.edu
URN etd-01262006-162731
Title Cryomilling of Aluminum-based and Magnesium-based Metal Powders
Degree Master of Science
Department Materials Science and Engineering
Advisory Committee
Advisor Name Title
Kampe, Stephen L. Committee Chair
Aning, Alexander O. Committee Member
Reynolds, William T. Jr. Committee Member
Keywords
  • Crystallite size
  • Hardness
  • X-ray diffraction
  • Cryomilling
  • Nanocrystalline materials
  • Al-Mg alloys
Date of Defense 2006-01-13
Availability unrestricted
Abstract
Ball milling has been shown to produce nanostructures in metal powders through severe repetitive deformation. Ball milling at cryogenic temperatures (cryomilling) is more effective in this capacity due to the low temperature by slowing recovery and minimizing diffusion distances between different components. Nanostructured metals are of interest because of their unique physical and mechanical properties. The result of cryomilling is powder consisting of crystallites on the order of 30 – 50 nm. In order to characterize the properties of this material, it is often necessary to consolidate the powder, which is often difficult without causing significant grain growth. In this work, aluminum-rich and magnesium-rich alloys of varying composition are produced by cryomilling and characterized by x-ray diffraction. A novel consolidation process called high shear powder consolidation (HSPC) is used to densify as-received and as-milled powders with minimal growth. The construction of a cryomill, along with a modification for improving process yield, has provided a platform for the study of nanocrystalline metals. It has been shown that bulk nanocrystalline materials are attainable and that alloy composition influences mechanical properties.
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