Ellipsometric Measurements of Plastically Deformed Copper
M. Mirića, R. Rudolfb, c, I. Anželb, B. Hadžića, M. Romčevića, J. Trajića and N. Romčevića, d
a Institute of Physics, 11080 Belgrade, Serbia
b Faculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia
c Zlatara Celje d.d., Kersenikova 19, 3000 Celje, Slovenia
d Kristal Infiz Doo, 11080 Belgrade, Serbia
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Chemically pure copper (99.99) prepared in the sample of square cross section (10×10 mm2) and length about 50 mm was extremely plastically deformed with the repeated application of equal channel angular pressing. Equal channel angular pressing was applied as an effective technique for producing bulk nanoscaled structures. It is well known that severe plastic deformation of metallic materials often leads to microstructure with ultrafine grains and cross sections which remain about equal before and after deformation. Optical properties of the sample were studied using spectroscopic ellipsometry in UV-VIS range. The parameters of the sample like copper oxide and surface roughness overlayer were calculated using two film model together with the Bruggeman effective medium approximation.
DOI: 10.12693/APhysPolA.116.715
PACS numbers: 78.20.-e, 78.40.Kc, 68.35.Ct