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Computer simulation on surfaces and [001] symmetric tilt grain boundaries in Ni, Al, and Ni3Al

Published online by Cambridge University Press:  31 January 2011

S. P. Chen ,
D. J. Srolovitz  and
A. F. Voter
S. P. Chen
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D. J. Srolovitz
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
A. F. Voter
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

We have used “local volume” (embedded atom) type potentials to study the surfaces and grain boundaries of Ni, Al, and Ni3Al. The simulations show that with appropriately fit potentials, the surface and grain boundary structure can be realistically calculated. The surface rippling and relaxation show good agreement with experiments. The energies of most surfaces and grain boundaries also agree with existing data. The structural unit model for grain boundaries in Ni3Al shows the same generic units as in pure metals, but with large variations due to distortions and multiplicity. The utility of the structural unit model is thus more limited for alloys. The grain boundary energies were found to be the highest for Al-rich Ni3Al grain boundaries, and depend significantly on the local composition of the grain boundary. The cusps in the grain boundary energy as a function of misorientation angle are different for different grain boundary stoichiometries. The Ni3Al grain boundaries have approximately the same grain boundary energy and cohesive energy as that of Ni.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 1 , February 1989 , pp. 62 - 77
Copyright
Copyright © Materials Research Society 1989

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