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Phase Stability of Ni2Al3 under Electron Irradiation

Published online by Cambridge University Press:  25 February 2011

E. A. Kenik  and
M. Nastasi
E. A. Kenik
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376
M. Nastasi
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545
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Abstract

In-situ electron irradiations at 200, 300, and 1000 keV have been performed on Ni2Al3 at 100 and 300 K. At low doses, the Ni2Al3 partially disorders to a B2 structure with a lattice parameter of 0.284 nm, close to that extrapolated for β-NiAl at 60 at.% Al, the Ni2Al3 composition. The electron dose required to disorder the Ni2Al3 decreased with increasing accelerating voltage and possibly with decreasing temperature. At high doses, precipitation of aluminum from the B2 matrix occurs, along with radiation-induced sputtering and radiation-induced segregation. Lattice parameter changes for the B2 structure observed during irradiation are explained in terms of the compositional dependence of the lattice parameter of β-NiAl. The B2 structure remains stable to a dose of 6 × 1028 electrons/m2, with no amorphization detected.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 128: Symposium A – Processing and Characterization of Materials Using Ion Beams , 1988 , 333
Copyright
Copyright © Materials Research Society 1989

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