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Generalized Melting Criterion for Amorphization

Published online by Cambridge University Press:  01 January 1992

R. Devanathan ,
N. Q. Lam ,
P. R. Okamoto  and
M. Meshii
R. Devanathan
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439 Dept. of Materials Science and Engineering, Northwestern University, Evanston, IL 60208
N. Q. Lam
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
P. R. Okamoto
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
M. Meshii
Affiliation:
Dept. of Materials Science and Engineering, Northwestern University, Evanston, IL 60208
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Abstract

We present a thermodynamic model of solid-state amorphization based on a generalization of the well-known Lindemann criterion. The original Lindemann criterion proposes that melting occurs when the root-mean-square amplitude of thermal displacement exceeds a critical value. This criterion can be generalized to include solid-state amorphization by taking into account the static displacements. In an effort to verify the generalized melting criterion, we have performed molecular dynamics simulations of radiation-induced amorphization in NiZr, NiZr2, NiTi and FeTi using embedded-atom potentials. The average shear elastic constant G was calculated as a function of the total mean-square atomic displacement following random atom-exchanges and introduction of Frenkel pairs. Our results provide strong support for the generalized melting criterion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 291: Symposium O – Materials Theory and Modeling , 1992 , 653
Copyright
Copyright © Materials Research Society 1993

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References

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