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Study of Fracture in Nb-Al Alloys and Pure Metals by Computer Molecular Dynamic Simulation

Published online by Cambridge University Press:  01 January 1992

Donghyun Kim ,
P. C. Clapp  and
J. A. Rifkin
Donghyun Kim
Affiliation:
Center for Materials Simulation, Institute of Materials Science, University of Connecticut Storrs, CT 06268
P. C. Clapp
Affiliation:
Center for Materials Simulation, Institute of Materials Science, University of Connecticut Storrs, CT 06268
J. A. Rifkin
Affiliation:
Center for Materials Simulation, Institute of Materials Science, University of Connecticut Storrs, CT 06268
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Abstract

In molecular dynamic studies of 15,000 atom arrays of A15 Nb3Al, BCC Nb and FCC Al containing crack under external stress in Mode I loading, it has been verified that fracture behavior can be predicted (starting in the vicinity of the crack) in terms of competition between dislocation nucleation and Griffith crack propagation. BCC Nb and FCC Al appears to be ductile and A15 Nb3Al appears to be brittle, in agreement with theoretical predictions. The elastic solution used for predictions was proposed by Rice[l] for the anisotropic material.

The interatomic interactions used in the simulation were Embedded Atom Method (EAM) potentials developed by Voter and Chen[2] for the Al-Al and by Rifkin[3] for the Nb-Nb and Nb-Al.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 507
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCE

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