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Theoretical Studies of Ni3Al and Nial with Impurities

Published online by Cambridge University Press:  26 February 2011

S. P. Chen ,
A. F. Voter ,
A. M. Boring ,
R. C. Albers  and
P. J. Hay
S. P. Chen
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
A. F. Voter
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
A. M. Boring
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
R. C. Albers
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
P. J. Hay
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

Intermetallic compounds have been extensively studied because of their superior strength, low creep rate, and high melting point [1,2]. However, room temperature ductility for the L12 and B2 phases are a continuing problem. Both L12 Ni3Al [3,4] and B2 NiAl [5,6] exhibit an intergranular fracture mode. Understanding grain boundaries in these materials is of particular importance since intergranular fracture limits the applicability of these otherwise promising materials. In an effort to understand the fracture mechanism, we have used embedded atom potentials [7] to study the properties of Ni 3Al [8,9,10] and NiAl [11]. We also consider the effect of boron, sulfur, and nickel segregation on the strength of grain boundaries in Ni3Al and NiAl. Many of the results presented here appear in literature elsewhere [8,9,10,11].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 149
Copyright
Copyright © Materials Research Society 1989

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References

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