J. Phys. Colloques 49 (1988) C6-329-C6-333
GRAIN BOUNDARY CHEMISTRY OF NiAlP.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.
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.