The Effect of Laser Shock Peening on Dislocation Morphology and Microstructural Evolution of AA5083-H116

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dc.contributor.advisorAnkem, Sreeramamurthyen_US
dc.contributor.authorTsao, Alice Uanchianen_US
dc.contributor.departmentMaterial Science and Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2020-02-06T06:35:02Z
dc.date.available2020-02-06T06:35:02Z
dc.date.issued2019en_US
dc.description.abstractThe AA5083-H116 aluminum alloys (Al-4.7Mg-0.62Mn-0.29Fe-0.15Si-0.099Cr-0.094Zn-0.036Cu-0.018Ti-0.086Other) are lightweight structural materials for marine applications. Due to the high magnesium content (>3wt.%), the sensitization of Al3Mg2 β-phase and susceptibility for intergranular stress corrosion cracking (IGSCC) in AA5083-H116 significantly increases under thermal exposure. The effects of laser-shock peening (LSP) on the kinetics of β-phase were studied via accelerated sensitization heat treatments between 70-175℃ for times between 5-3,600 hours. Optical microscopy, transmission electron microscopy (TEM), and finite element method (FEM) modeling were utilized to study the effect of LSP on AA5083-H116 microstructural evolution, dislocation morphology, and stress-strain distribution. FEM results showed LSP induces plastic compressive deformation near the surface. TEM observations confirmed the models, showing dislocation density increased by a factor of ~4.7, with residual tensile stresses throughout the thickness. The kinetics of β-phase precipitation and coarsening were not impacted by LSP; however, it is recommended that its influence on IGSCC should be investigated further.en_US
dc.identifierhttps://doi.org/10.13016/i6s9-gyax
dc.identifier.urihttp://hdl.handle.net/1903/25532
dc.language.isoenen_US
dc.subject.pqcontrolledMaterials Scienceen_US
dc.subject.pquncontrolledAA5083en_US
dc.subject.pquncontrolledBeta phaseen_US
dc.subject.pquncontrolledDislocation Morphologyen_US
dc.subject.pquncontrolledFinite Element Methoden_US
dc.subject.pquncontrolledLaser shock peeningen_US
dc.subject.pquncontrolledSensitizationen_US
dc.titleThe Effect of Laser Shock Peening on Dislocation Morphology and Microstructural Evolution of AA5083-H116en_US
dc.typeThesisen_US

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