Plastic deformation and fracture behavior of a Fe-modified Al3 Ti-base L12 intermetallic alloy

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DOIResolve DOI: http://doi.org/10.1557/JMR.1991.0957
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TypeArticle
Journal titleJournal of Materials Research
Volume6
Issue5
Pages957963; # of pages: 7
Subjectplastic deformation
AbstractThe microstructure of the ordered intermetallic alloy with a nominal composition of Al66Fe9Ti24 is nearly single-phase L12 structure, with a few second phase agglomerates at some grain corners. Room temperature compression tests showed that this material exhibits a plastic strain of about 11% at fracture. Final fracture of the compression specimens occured by a shear-off process along a surface oriented about 45 degrees to the compression axis. Fractographic analysis revealed that the fracture is transcrystalline and the fracture mode is mainly quasicleavage plus tearing. Transmission electron microscopy (TEM) was used to explore its deformation mechanisms. The dislocation density was low after homogenization, but is greatly increased during deformation. The deformation mode was found to be {110}{111} slip instead of twinning as in Al3Ti. The Α{110} superdislocations dissociated into two partials of Α/3(211)-type, bounding a superlattice intrinsic stacking fault (SISF) on the {111} slip plane.
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LanguageEnglish
Peer reviewedYes
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NPARC number21276877
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Record identifier45bb1bc5-1c15-4ae0-b4fb-9ec1b62ba257
Record created2015-10-30
Record modified2016-05-09
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