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Atomistic Study of Cleavage and Dislocation Emission in NiAl

Published online by Cambridge University Press:  22 February 2011

M. Ludwig  and
P. Gumbsch
M. Ludwig
Affiliation:
Max-Planck-Institut für Metallforschung, Seestr. 92, 70174 Stuttgart, Germany
P. Gumbsch
Affiliation:
Max-Planck-Institut für Metallforschung, Seestr. 92, 70174 Stuttgart, Germany
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Abstract

The atomistic processes during fracture of NiAl are studied using a new embedded atom (EAM) potential to describe the region near the crack tip. To provide the atomistically modeled crack tip region with realistic boundary conditions, a coupled finite element - atomistic (FEAt) technique [1] is employed. In agreement with experimental observations, perfectly brittle cleavage is observed for the (110) crack plane. In contrast, cracks on the (100) plane either follow a zig-zag path on (110) planes, or emit dislocations. Dislocation generation is studied in more detail under mixed mode I/II loading conditions.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 389
Copyright
Copyright © Materials Research Society 1995

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