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Numerical simulations of atomic-scale disordering processes at impact between two rough crystalline surfaces

Delogu, Francesco and Cocco, Giorgio (2006) Numerical simulations of atomic-scale disordering processes at impact between two rough crystalline surfaces. Physical Review. B, Vol. 74 , p. 035406/1-13. eISSN 1550-235X. Article.

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DOI: 10.1103/PhysRevB.74.035406

Abstract

Numerical calculations have been used to throw light on the mechanical deformation and the atomic mixing processes taking place when two different metallic systems collide at low temperature. To this end, two semicrystals terminating with a free surface were pushed each against the other at a given relative velocity. Surfaces of different roughness were considered under different impact conditions. Simple mechanical loads on plane surfaces did not induce any significant mixing of atomic species at the interface, observed instead in collisions involving either rough surfaces or plane surfaces undergoing a relative sliding. In the case of rough surfaces, the local contact between the semicrystals is initially sustained by surface asperities. The atoms there located experience thus sudden mechanical loads and an unusual localization of kinetic energy, which enhance their mobility and favor the mixing process. A diffuse interfacial region with a disordered structure correspondingly appears. Its structural features were not significantly modified by the thermal relaxation processes occurring after the compressive load removal.

Item Type:Article
ID Code:644
Status:Published
Refereed:Yes
Uncontrolled Keywords:Numerical calculations, mechanical deformation, atomic mixing processes, metallic systems
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:The American Physical Society
eISSN:1550-235X
Publisher Policy:Depositato in conformità con la politica di copyright dell'Editore
Deposited On:18 Aug 2009 10:02

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