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

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dc.contributor Allison, Paul Galon
dc.contributor Brewer, Luke N.
dc.contributor Daniewicz, Steven R.
dc.contributor.advisor Jordon, J. Brian
dc.contributor.author Wlodarski, James Schuyler
dc.date.accessioned 2019-02-12T14:31:15Z
dc.date.available 2019-02-12T14:31:15Z
dc.date.issued 2018
dc.identifier.other u0015_0000001_0003178
dc.identifier.other Wlodarski_alatus_0004M_13641
dc.identifier.uri http://ir.ua.edu/handle/123456789/5361
dc.description Electronic Thesis or Dissertation
dc.description.abstract This 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.
dc.format.extent 31 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 Mechanical engineering
dc.title Fatigue behavior of additive friction stir layer welding of Az31 magnesium alloy
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Department 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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