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dc.contributor.advisorMcNelley, Terry R.
dc.contributor.authorMeyer, Chris D.
dc.dateDecember 1991
dc.date.accessioned2013-01-23T22:04:27Z
dc.date.available2013-01-23T22:04:27Z
dc.date.issued1991-12
dc.identifier.urihttp://hdl.handle.net/10945/26713
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractA thermomechanical processing (TMP) schedule developed in previous work was modified to provide for an increasing strain and strain rate with each polling pass. three alloys, Al-10mg, Al-10mg-0.2Mn, and AL-10mg-0.5mn (compositions in wt. pct.), were processed utilizing this schedule. Samples were obtained following various rolling passes for subsequent microscopy analysis. Materials in both the as-rolled condition and following 25 minutes of annealing were studied. Utilizing backscattered imaging techniques with the scanning electron microscope, the microstructural evolution of these alloys during the TMP were studied. Second phase particles were observed to precipitate on grain boundaries and deformation structures in the intermediate stages of the TMP. In addition, second phase precipitates developed on MnAl6 particles through heterogeneous nucleation in the Manganese containing alloys. Particle simulation of recrystallization was observed in the latter stages of the TMP as precipitate particles coarsened. Tensile testing at 300(o)C demonstrated the superplastic response of each alloy, and showed that the addition of Manganese enhances superplastic response. Strain rate sensitivity coefficients were observed to initially decease with increasing strain, but then increased with further straining.en_US
dc.description.urihttp://archive.org/details/processingmicros00meye
dc.format.extent62 p.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.titleProcessing, microstructure and superplasticity in Al-Mg-Mn alloysen_US
dc.typeThesisen_US
dc.contributor.secondreaderKalu, Peter N.
dc.contributor.corporateNaval Postgraduate School
dc.contributor.departmentMechanical Engineering
dc.subject.authorSuperplasticityen_US
dc.subject.authorParticle stimulated nucleationen_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameM.S. in Engineering Scienceen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineEngineering Scienceen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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