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A Percolation Model for Elastic Softening in Intermetallic Compounds During Solid-State Amorphization

Published online by Cambridge University Press:  26 February 2011

Carlo Massobrio  and
Vassilis Pontikis
Carlo Massobrio
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Physique Expérimentale, CH-1015 Lausanne, Switzerland
Vassilis Pontikis
Affiliation:
Laboratoire d'Etudes des Solides Irradiés, CEREM, CEA, Ecole Polytechnique, 91128 Palaiseau Cedex, France
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Abstract

By using isobaric-isothermal molecular dynamics and an n-body effective potential, we show that a dramatic elastic softening precedes the amorphization of NiZr2 occurring on chemically disordering the alloy. Above a critical level of chemical disorder, the shear elastic constant of the alloy increases suddenly up to a value comparable to the one of the amorphous solid obtained by quenching the liquid. This phenomenon occurs at the percolation threshold of the anelastically distorted regions surrounding the antisite defects. The percolation model describes satisfactorily experimental findings concerning the elastic softening and the loss of crystalline order in intermetallic compounds induced by irradiation or hydrogenation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 278: Symposium W – Computational Methods in Materials Science , 1992 , 299
Copyright
Copyright © Materials Research Society 1992

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