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Title: Disorder-induced amorphization

Abstract

Many crystalline materials undergo a crystalline-to-amorphous (c-a) phase transition when subjected to energetic particle irradiation at low temperatures. By focusing on the mean-square static atomic displacement as a generic measure of chemical and topological disorder, we are led quite naturally to a generalized version of the Lindemann melting criterion as a conceptual framework for a unified thermodynamic approach to solid-state amorphizing transformations. In its simplest form, the generalized Lindemann criterion assumes that the sum of the static and dynamic mean-square atomic displacements is constant along the polymorphous melting curve so that c-a transformations can be understood simply as melting of a critically-disordered crystal at temperatures below the glass transition temperature where the supercooled liquid can persist indefinitely in a configurationally-frozen state. Evidence in support of the generalized Lindemann melting criterion for amorphization is provided by a large variety of experimental observations and by molecular dynamics simulations of heat-induced melting and of defect-induced amorphization of intermetallic compounds.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
508157
Report Number(s):
ANL/MSD/CP-92842; CONF-9610315-1
ON: DE97007072; TRN: 97:004695
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 6. international workshop on defect production, accumulation and materials performance in irradiation environment, Davos (Switzerland), 2-8 Oct 1996; Other Information: PBD: Mar 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; NICKEL ALLOYS; PHASE TRANSFORMATIONS; ZIRCONIUM ALLOYS; ALUMINIUM COMPOUNDS; IRON ALLOYS; TITANIUM ALLOYS; ATOMIC DISPLACEMENTS; INTERMETALLIC COMPOUNDS; IRRADIATION; TRANSITION TEMPERATURE; AMORPHOUS STATE; MATHEMATICAL MODELS; POTENTIAL ENERGY; FREE ENERGY

Citation Formats

Lam, N.Q., Okamoto, P.R., and Li, Mo. Disorder-induced amorphization. United States: N. p., 1997. Web.
Lam, N.Q., Okamoto, P.R., & Li, Mo. Disorder-induced amorphization. United States.
Lam, N.Q., Okamoto, P.R., and Li, Mo. Sat . "Disorder-induced amorphization". United States. https://www.osti.gov/servlets/purl/508157.
@article{osti_508157,
title = {Disorder-induced amorphization},
author = {Lam, N.Q. and Okamoto, P.R. and Li, Mo},
abstractNote = {Many crystalline materials undergo a crystalline-to-amorphous (c-a) phase transition when subjected to energetic particle irradiation at low temperatures. By focusing on the mean-square static atomic displacement as a generic measure of chemical and topological disorder, we are led quite naturally to a generalized version of the Lindemann melting criterion as a conceptual framework for a unified thermodynamic approach to solid-state amorphizing transformations. In its simplest form, the generalized Lindemann criterion assumes that the sum of the static and dynamic mean-square atomic displacements is constant along the polymorphous melting curve so that c-a transformations can be understood simply as melting of a critically-disordered crystal at temperatures below the glass transition temperature where the supercooled liquid can persist indefinitely in a configurationally-frozen state. Evidence in support of the generalized Lindemann melting criterion for amorphization is provided by a large variety of experimental observations and by molecular dynamics simulations of heat-induced melting and of defect-induced amorphization of intermetallic compounds.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {3}
}

Conference:
Other availability
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