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dc.contributor.authorKulas, Mary-Anne
dc.contributor.authorGreen, W. Paul
dc.contributor.authorTaleff, Eric M.
dc.contributor.authorKrajewski, Paul E.
dc.contributor.authorMcNelley, Terry R.
dc.date.accessioned2017-09-05T22:20:30Z
dc.date.available2017-09-05T22:20:30Z
dc.date.issued2006
dc.identifier.citationM.-A. Kulas, W.P. Green, E.M. Taleff, P.E. Krajewski, T.R. McNelley, "Failure mechanisms in superplastic AA5083 materials," Metallurgical and Materials Transactions A, v.37A, (March 2006), pp. 646- 655.en_US
dc.identifier.urihttp://hdl.handle.net/10945/55844
dc.description.abstractThe mechanisms of tensile failure in four 5083 aluminum sheet materials are evaluated under conditions of interest for superplastic and quick-plastic forming. Two mechanisms are shown to control failure of the AA5083 materials under uniaxial tension at elevated temperatures: cavitation and flow localization (i.e., necking). Conditions for which failure is controlled by cavitation correspond to those under which deformation is primarily by grain-boundary-sliding creep. Conditions for which failure is controlled by flow localization correspond to those under which deformation is primarily by solute- drag creep. A geometric parameter, Q, is used to determine whether final failure is controlled by cavitation or by flow localization. Differences in elongations to failure between the different AA5083 materials at high temperatures and slow strain rates are the result of differences in cavitation behaviors. The rate of cavitation growth with strain is nearly constant between the AA5083 materials for identical testing conditions, but materials with less tensile ductility evidence initial cavitation development at lower strain levels. The rate of cavitation growth with strain is shown to depend on the governing deformation mechanism; grain-boundary-sliding creep produces a faster cavitation growth rate than does solute-drag creep. A correlation is found between the early development of cavitation and the intermetallic particle-size population densities of the AA5083 materials. Fine filaments, oriented along the tensile axis, are observed on fracture surfaces and within surface cavities of specimens deformed primarily under grain-boundary-sliding creep. As deformation transitions to control by solute-drag creep, the density of these filaments dramatically decreases.en_US
dc.description.sponsorshipGeneral Motors Corporationen_US
dc.format.extent11 p.en_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleFailure mechanisms in superplastic AA5083 materialsen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentMechanical Engineeringen_US


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