COSEGREGATION-INDUCED MORPHOLOGICAL INSTABILITIES OF (110)- AND (111)-ORIENTED SURFACES OF RANDOM MIXING BODY-CENTERED-CUBIC ALLOYS

Christian Uebing
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Christian Uebing: Max-Planck-Institut für Eisenforschung, D-40237 Düsseldorf, Germany

Surface Review and Letters (SRL), 1995, vol. 02, issue 06, 717-722

Abstract: Cosegregation-induced morphological instabilities of (110)- and (111)-oriented surfaces of random mixing body-centered-cubic alloys have been studied with Auger electron spectroscopy, low-energy electron diffraction, and scanning electron microscopy. Surface cosegregation has been investigated on (110)-and (111)-oriented Fe-15%Cr-N, Fe-3%V-C, Fe-3%V-N, and Fe-3%V-C, N single crystals. Cosegregation induces the faceting of the bcc(111) and (110) alloy surfaces. In all cases studied the facet orientation is {100} allowing the epitaxial stabilization of the binary and ternary surface compounds and surface precipitates CrN, VC, VN, and V(C, N). The morphological instability of the bcc(110) surface is rationalized by a missing- and added-row reconstruction model which demonstrates the formation of {100} microfacets.

Date: 1995
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DOI: 10.1142/S0218625X95000649

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