Plastic deformation and fracture behavior of a Fe-modified Al3Ti-base L12 intermetallic alloy | Zendy

HU Gengxiang | Zendy; Shipu Chen | Zendy; Xiaohua Wu | Zendy; Xiaofu Chen | Zendy

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Plastic deformation and fracture behavior of a Fe-modified Al₃Ti-base L1₂ intermetallic alloy

Author(s) -

HU Gengxiang,

Shipu Chen,

Xiaohua Wu,

Xiaofu Chen

Publication year - 1991

Publication title -

journal of materials research/pratt's guide to venture capital sources

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.788

H-Index - 148

eISSN - 0884-2914

pISSN - 0884-1616

DOI - 10.1557/jmr.1991.0957

Subject(s) - materials science , intermetallic , crystal twinning , composite material , superlattice , microstructure , slip (aerodynamics) , alloy , dislocation , deformation mechanism , transmission electron microscopy , deformation (meteorology) , metallurgy , crystallography , thermodynamics , physics , chemistry , optoelectronics , nanotechnology

The 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 \u391{110} superdislocations dissociated into two partials of \u391/3(211)-type, bounding a superlattice intrinsic stacking fault (SISF) on the {111} slip plane.Peer reviewed: YesNRC publication: N

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