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Titolo:
Modelling structural stability under irradiation
Autore:
Ossi, PM;
Indirizzi:
Politecn Milan, INFM, Dipartimento Ingn Nucl, I-20133 Milan, Italy Politecn Milan Milan Italy I-20133 mento Ingn Nucl, I-20133 Milan, Italy
Titolo Testata:
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICSELECTRONIC OPTICAL AND MAGNETIC PROPERTIES
fascicolo: 11-12, volume: 79, anno: 1999,
pagine: 2129 - 2136
SICI:
1364-2812(199911/12)79:11-12<2129:MSSUI>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLASS-FORMING ABILITY; MOLECULAR-DYNAMICS; ION-BOMBARDMENT; TA SYSTEM; INTERMETALLIC COMPOUNDS; DISPLACEMENT CASCADES; ZIRCONIUM ALLOYS; PHASE-FORMATION; SEGREGATION; AMORPHIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Ossi, PM Politecn Milan, INFM, Dipartimento Ingn Nucl, Via Ponzio 34-3, I-20133 Milan, Italy Politecn Milan Via Ponzio 34-3 Milan Italy I-20133 Milan, Italy
Citazione:
P.M. Ossi, "Modelling structural stability under irradiation", PHIL MAG B, 79(11-12), 1999, pp. 2129-2136

Abstract

When a film of a binary metallic alloy is bombarded by ions under conditions favourable to the development of dense collision cascades, it explores kinetic and thermodynamic regions not accessible by other techniques. In this work the main characteristics of the atomistic segregation-charge transfer model, for interpreting phase nucleation under irradiation, are outlined. A local non-equilibrium compositional profile evolves at the interface between each single cascade and the crystalline matrix driven by the preferential migration to the interface of one of the film constituents. Concurrently, a charge density profile evolves, which can be non-equilibrium over the timescale for cascade quenching. Relaxation to (meta)stable equilibrium is simulated by a charge transfer reaction, involving a couple of dissimilar atoms of the original alloy, which are ionized and form a dimer of an effective alloy. The model is used to evaluate both the amount of energy requiredto introduce an effective alloy dimer into the matrix and the local strainsuffered by the target as a consequence of ion formation by a charge transfer reaction. Both structure stability parameter threshold values are foundfor a set of seven amorphized and five crystalline alloys under ion bombardment and they make it possible to separate crystalline from vitrified alloys.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 15:13:15