期刊
SURFACE SCIENCE
卷 498, 期 3, 页码 321-336出版社
ELSEVIER
DOI: 10.1016/S0039-6028(01)01811-8
关键词
density functional calculations; computer simulations; adhesion; surface energy; tribology; aluminum; carbides
We examine the relative stability and adhesion of the polar Al(1 1 1)/WC(0 0 0 1) interface using density functional theory. Relaxed atomic geometries and the ideal work of adhesion were calculated for six different interfacial structures, taking into account both W- and C-terminations of the carbide. The interfacial electronic structure was analyzed to determine the nature of metal/carbide bonding. Based on the surface and interfacial free energies, we find that both the clean WC(0 0 0 1) surface and the optimal interface geometry are W-terminated. Although both terminations yield substantial adhesion energies in the range 4-6 J/m(2), bonding at the optimal C-terminated structure is nearly 2 J/m(2) stronger, consistent with an argument based on surface reactivity. In addition, we examine the effects of Li and Mg alloying elements at the interface, and find that they result in a strain-induced reduction of metal-ceramic adhesion. (C) 2001 Elsevier Science B.V. All rights reserved.
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