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Stress Induced Martensitic(SIM) Transformations In B2 NiAl Observed in Crack Propagation Computer Simulations

Published online by Cambridge University Press:  26 February 2011

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 dynamics studies of 10,000 atom arrays of stoichiometric B2 NiAl containing a crack under external stress in Mode I loading, it has been observed that a martensitic transformation generally occurs (starting in the vicinity of the crack tip) prior to the generation of dislocations and/or the propagation of the crack. The martensitic phase appears to be 2H, in agreement with experimental observations of SIM at higher Ni compositions (62 at % Ni). The interatomic interactions used in the simulations were the Embedded Atom Method (EAM) potentials developed by Voter and Chen [1] for the Ni-Al alloy system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 249
Copyright
Copyright © Materials Research Society 1991

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References

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