Fatigue behavior of additive friction stir layer welding of Az31 magnesium alloy

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dc.contributorAllison, Paul Galon
dc.contributorBrewer, Luke N.
dc.contributorDaniewicz, Steven R.
dc.contributor.advisorJordon, J. Brian
dc.contributor.authorWlodarski, James Schuyler
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2019-02-12T14:31:15Z
dc.date.available2019-02-12T14:31:15Z
dc.date.issued2018
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractThis work examines the fatigue behavior of additive friction stir layer welding (AFSLW) of AZ31 Mg Alloy. The AFSLW process was used to fabricate a seven-layer build using 5 mm thick plates of AZ31 Mg alloy. Optical microscopy of the cross-section of the AFSLW build revealed an asymmetric grain size distribution through the layers of the build. In particular, the middle layers of the build exhibited more refined grain structure compared to the initial and final weld layers. Experimental tensile tests results of AFSLW specimens showed a 33% reduction in ultimate tensile strength (UTS) compared to the base material. In addition, experimental fatigue results of the AFSLW build demonstrated a reduction in the stress-life behavior compared to the base material. The reduction in fatigue performance is likely due to reheating the material caused by the multiple pass build method used to fabricate the build. The fatigue results of the AZ31 Mg alloy processed with AFSLW are not unexpected considering the loss of heat treatment due to the AFSLW process. Post-mortem analysis via scanning electron microscopy (SEM) showed that the AFSLW specimens exhibited similar fatigue crack initiation and crack growth mechanics compared to the base material. The results of this study suggest that structurally sound builds with generally acceptable mechanical properties for as-built structures can be achieved using the AFSLW process.en_US
dc.format.extent31 p.
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otheru0015_0000001_0003178
dc.identifier.otherWlodarski_alatus_0004M_13641
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5361
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectMechanical engineering
dc.titleFatigue behavior of additive friction stir layer welding of Az31 magnesium alloyen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Mechanical Engineering
etdms.degree.disciplineMechanical Engineering
etdms.degree.grantorThe University of Alabama
etdms.degree.levelmaster's
etdms.degree.nameM.S.
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