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

Published online by Cambridge University Press:  31 January 2011

Hu Gengxiang
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
Chen Shipu
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
Wu Xiaohua
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
Chen Xiaofu
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
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Abstract

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 occurred 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 a〈110〉 superdislocations dissociated into two partials of a/3〈211〉-type, bounding a superlattice intrinsic stacking fault (SISF) on the {111} slip plane.

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Articles
Copyright
Copyright © Materials Research Society 1991

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