Cryomilling of Aluminum-based and Magnesium-based Metal Powders

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dc.contributor.authorMaisano, Adam J.en
dc.contributor.committeechairKampe, Stephen L.en
dc.contributor.committeememberAning, Alexander O.en
dc.contributor.committeememberReynolds, William T. Jr.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T20:31:05Zen
dc.date.adate2006-01-31en
dc.date.available2014-03-14T20:31:05Zen
dc.date.issued2006-01-13en
dc.date.rdate2006-01-31en
dc.date.sdate2006-01-26en
dc.description.abstractBall 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.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-01262006-162731en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01262006-162731/en
dc.identifier.urihttp://hdl.handle.net/10919/31045en
dc.publisherVirginia Techen
dc.relation.haspartAdamMaisanoMSThesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectCrystallite sizeen
dc.subjectHardnessen
dc.subjectX-ray diffractionen
dc.subjectCryomillingen
dc.subjectNanocrystalline materialsen
dc.subjectAl-Mg alloysen
dc.titleCryomilling of Aluminum-based and Magnesium-based Metal Powdersen
dc.typeThesisen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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