Elastic-plastic characterization of nanocrystalline Al-Mg alloy using nanoindentation

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dc.contributor Ladani, Leila J.
dc.contributor Weaver, Mark Lovell
dc.contributor Williams, Keith A.
dc.contributor.advisor Ladani, Leila J.
dc.contributor.author Harvey, Evan Matthews
dc.date.accessioned 2017-04-26T14:22:20Z
dc.date.available 2017-04-26T14:22:20Z
dc.date.issued 2012
dc.identifier.other u0015_0000001_0000889
dc.identifier.other Harvey_alatus_0004M_11071
dc.identifier.uri http://ir.ua.edu/handle/123456789/2916
dc.description Electronic Thesis or Dissertation
dc.description.abstract A nanocrystalline Al-Mg alloy synthesized via cryomilling and consolidated by cold isostatic pressing with subsequent extrusion was subjected to nanoindentation testing. The data collected from these tests was subjected to different data analysis techniques to investigate the capabilities of such techniques in full, accurate elastic-plastic mechanical characterization. A commercially available, coarse-grained sample of this same Al-Mg alloy was also tested to investigate these models' capabilities of distinguishing between the two types of material. Finite element analysis was used as a verification mechanism for the property values extracted from the nanocrystalline material, and initial results showed signs of good accuracy of characterization. Additionally, extensive testing was performed in an effort to investigate how the levels of certain test parameters might affect the resulting values of calculated mechanical properties. The test parameters that were varied during experimentation were maximum applied load, loading/unloading rate, and length of hold period at maximum load. Tests were conducted on specimens cut longitudinal and transverse to the extrusion direction of the bulk sample to investigate any effects anisotropy might play in the characterization process. Results show the levels of the studied parameters can hold effect over the measured values of hardness (H), elastic modulus (E), yield stress (σ_y), and strain-hardening exponent (n). This implies that individual materials may require specific levels of testing parameters if accurate values of mechanical properties are to be measured. Extensive comparison of load-depth behavior indicated that longitudinal specimens exhibit greater material non-homogeneity than transverse specimens as expected trends showed greater variation in the former.
dc.format.extent 107 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Engineering
dc.title Elastic-plastic characterization of nanocrystalline Al-Mg alloy using nanoindentation
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Mechanical Engineering
etdms.degree.discipline Mechanical Engineering
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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