EDP Sciences Journals List
Issue J. Phys. Colloques
Volume 49, Number C6, Novembre 1988
35th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ
Page(s) C6-329 - C6-333
DOI http://dx.doi.org/10.1051/jphyscol:1988657

35th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ

J. Phys. Colloques 49 (1988) C6-329-C6-333

DOI: 10.1051/jphyscol:1988657

GRAIN BOUNDARY CHEMISTRY OF NiAl

P.P. CAMUS1, I. BAKER2, J.A. HORTON1 et M.K. MILLER1

1  Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376, U.S.A.
2  Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, U.S.A.


Abstract
Atom probe analyses performed at the grain boundaries in Ni-49 at. % Al indicated a majority of regions that contained almost no aluminum and a few regions that indicated neither enrichment nor depletion of aluminum. The widths of the depleted zones were less than 0.5 nm. It is proposed that this aluminum depleted zone could be a cause of the enhanced ductility and change in fracture mechanism that occurs in this intermetallic alloy as compared to NiAl alloys further from stoichiometry.