The effects of processing conditions on static abnormal grain growth in Al-Mg alloy AA5182

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The effects of processing conditions on static abnormal grain growth in Al-Mg alloy AA5182

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dc.contributor.advisor Taleff, Eric M.
dc.creator Carpenter, Alexander James
dc.date.accessioned 2011-06-17T16:37:04Z
dc.date.accessioned 2011-06-17T16:37:20Z
dc.date.available 2011-06-17T16:37:04Z
dc.date.available 2011-06-17T16:37:20Z
dc.date.created 2011-05
dc.date.issued 2011-06-17
dc.date.submitted May 2011
dc.identifier.uri http://hdl.handle.net/2152/ETD-UT-2011-05-2681
dc.description.abstract Static abnormal grain growth (SAGG) was studied in Al-Mg alloy AA5182 sheet by varying four processing parameters: deformation temperature, strain rate, annealing temperature, and annealing time. SAGG is a secondary recrystallization process related to geometric dynamic recrystallization (GDRX) and requires both deformation at elevated temperature and subsequent static annealing. A minimum temperature is required for both SAGG and GDRX. Recrystallized grains only develop at strains larger than the critical strain for SAGG, [epsilon]SAGG. The size of the recrystallized grains is inversely related to and controlled by the density of SAGG nuclei, which increases as local strain increases. The results of this study suggest that SAGG is controlled by two thermally-activated mechanisms, dynamic recovery and recrystallization. During deformation, dynamic recovery increases as deformation temperature increases or strain rate decreases, increasing the critical strain for SAGG. SAGG is subject to an incubation time that decreases as annealing temperature increases. SAGG can produce grains large enough to reduce yield strength by 20 to 50 percent. The results of this study suggest strategies for avoiding SAGG during hot-metal forming operations by varying processing conditions to increase [epsilon]SAGG.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject SAGG
dc.subject Static abnormal grain growth
dc.subject AA5182
dc.subject Deformation temperature
dc.subject Strain rate
dc.subject Annealing
dc.subject Recrystallization
dc.title The effects of processing conditions on static abnormal grain growth in Al-Mg alloy AA5182
dc.date.updated 2011-06-17T16:37:20Z
dc.contributor.committeeMember Bourell, David L.
dc.description.department Mechanical Engineering
dc.type.genre thesis
dc.type.material text
thesis.degree.department Mechanical Engineering
thesis.degree.discipline Mechanical Engineering
thesis.degree.grantor University of Texas at Austin
thesis.degree.level Masters
thesis.degree.name Master of Science in Engineering

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