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The Microchemistry Studies of Ductile Ll2 Ni-Based Intermetallics

Published online by Cambridge University Press:  22 February 2011

Naoya Masahashi*
Affiliation:
University of Cambridge, Department of Materials Science & Metallurgy Pembroke Street, Cambridge, CB2 3QZ, U.K.
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Abstract

Auger electron microscopy (AES) analysis of boron doped Ni3Al have shown boron segregation at grain boundary (GB). Boron segregation was enhanced with increasing bulk boron content independent of stoichiometry, suggesting that hypo-stoichiometric alloy is intrinsically ductile even without boron. A slight Ni cosegregation is confirmed using atom probe field ion microscope (APFIM). In Ni3(Si,Ti), no distinct composition fluctuation was identified between matrix and GB vicinity. These results suggest that atomic bonding atmosphere modification from covalent to metallic in the vicinity of GB is one of factors to modify ductility for Ll2-type intermetallics.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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