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Magnetism-driven anomalous surface alloying between Cu and Cr
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
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2009 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, no 17Article in journal (Refereed) Published
Abstract [en]

Cu-Cr contact materials are widely used as medium- and high-voltage vacuum interrupters. The microstructure of these materials is critical in their performance: the finer structure they have, the better are their physical properties. A solid solution of Cu and Cr could significantly increase the performance of such contact materials. However, Cu and Cr are practically immiscible in the bulk phase. Based on first principles density functional theory we show here that the solubility of Cr in Cu is dramatically increased on Cu surfaces already at room temperature and Cu-Cr alloys are formed on both the Cu(111) and Cu(100) surfaces. We demonstrate that the origin of this phenomenon is the unique magnetic properties of Cr atoms near surfaces.

Place, publisher, year, edition, pages
2009. Vol. 94, no 17
Keyword [en]
chromium alloys, copper, copper alloys, crystal microstructure, density, functional theory, solid solutions, solubility, surface alloying, surface magnetism, potential model, metals, vacuum, approximation, contacts, growth, energy, copper, iron
URN: urn:nbn:se:kth:diva-18379DOI: 10.1063/1.3116649ISI: 000265738700046ScopusID: 2-s2.0-65449181160OAI: diva2:336425
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-02-10Bibliographically approved

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Johansson, BörjeVitos, Levente
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