Abstract:
The effects of interstitial carbon on the diffusion and mechanical
properties of copper and silver are studied theoretically. Semiempirical
methodology, atomistic simulations, and first-principles density functional
schemes are combined to extract some understanding of the diffusion process
and lattice reconstruction in extremely dilute interstitial Cu-C and Ag-C
alloys, lt is demonstrated that carbon inclusion in the host matrix leads
to sufficient non-uniform dilatation of the lattice. We also show that
an account of static displacements is important in the calculations of
the activation energy for the diffusion of the interstitial atoms. The
"embedded" cluster scheme is suggested to simulate the relaxation in extremely
dilute alloys. High-resolution scanning electron microscopy results are
presented, which demonstrate the existence of a solid solution zone at
the Cu-C interface. (C) 2001 Elsevier Science B.V, All rights reserved.
Author Keywords:
copper, silver, carbon, solid solutions, diffusion, atomistic simulations
KeyWords Plus:
ALLOYS, COMPOSITES, OPTIMIZATION, INTERFACE, GRAPHITE, METALS, MATRIX
Addresses:
Mundim KC, Univ Fed Bahia, Inst Phys, Salvador, BA, Brazil
Univ Fed Bahia, Inst Phys, Salvador, BA, Brazil
Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
Technion Israel Inst Technol, Fac Phys, Haifa, Israel
Technion Israel Inst Technol, Dept Mat Engn, Haifa, Israel
Publisher: ELSEVIER
SCIENCE BV, AMSTERDAM
IDS Number: 417LB
ISSN:
0166-1280