Antiphase boundary energies of L12 ordered Ni74.5Pd2Al23.5 alloy

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Original languageEnglish
Pages (from-to)1093-1095
Journal / PublicationMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume28 A
Issue number4
Publication statusPublished - Apr 1997
Externally publishedYes


The effects of palladium doping on the structure of the antiphase boundary (APB) coupled dislocations and the APB energies in the deformed Ni3Al alloy is reported. The chemical composition of the arc melted Ni74.5Pd2Al23.5 alloy is closed to its nominal composition as revealed by an energy dispersive X-ray spectrometer in a scanning electron microscope. The dislocation structure of the alloy consists of undissociated dislocations induced by compressive deformation. Pd doping enhances the ductility of the alloy and the enhanced ductility is unlikely to result from the small decrease in APB energies.