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Oxidation resistance of the supercooled liquid in Cu50Zr50 and Cu46Zr46Al8 metallic glasses

Published online by Cambridge University Press:  21 February 2012

Ka Ram Lim
Affiliation:
Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
Won Tae Kim
Affiliation:
Department of Optical Engineering, Cheongju University, Cheongju 360-764, Korea
Eun-Sung Lee
Affiliation:
Materials Research Center, Samsung Advanced Institute of Technology (SAIT), Gyeonggi-do 446-712, Korea
Sang Soo Jee
Affiliation:
Materials Research Center, Samsung Advanced Institute of Technology (SAIT), Gyeonggi-do 446-712, Korea
Se Yun Kim
Affiliation:
Materials Research Center, Samsung Advanced Institute of Technology (SAIT), Gyeonggi-do 446-712, Korea
Do Hyang Kim*
Affiliation:
Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea
Annett Gebert
Affiliation:
IFW Dresden, Institute for Complex Materials, D-01171 Dresden, Germany
Jurgen Eckert
Affiliation:
IFW Dresden, Institute for Complex Materials, D-01171 Dresden, Germany; and TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany
*
a)Address all correspondence to this author. e-mail: dohkim@yonsei.ac.kr
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Abstract

The oxidation behavior of Cu50Zr50 and Cu46Zr46Al8 glasses during continuous heating up to 1073 K has been investigated, with special emphasis on the oxidation resistance in the supercooled liquid (SCL) state. For Cu50Zr50, the oxide layer mostly consists of monoclinic ZrO2 (m-ZrO2), while for Cu46Zr46Al8, the oxide layer consists of two different layers: an outer layer consisting of tetragonal ZrO2 (t-ZrO2) + Al2O3 + metallic Cu (oxidation product from the SCL state of the glass matrix) and inner layer comprised of m-ZrO2 + metallic Cu islands (oxidation product from the crystallized matrix). Cu-enriched regions consisting of Cu51Zr14 (in Cu50Zr50) or AlCu2Zr + Cu70Zr15Al15 + Cu51Zr14 (in Cu46Zr46Al8) are present below the oxide layer. The present study shows that the addition of Al (8 at.%) in Cu50Zr50 results in a significant deterioration of the oxidation resistance in the SCL state since the solutionizing of Al in t-ZrO2 leads to a higher oxygen ion vacancy concentration, thus providing a higher activity of oxygen ions.

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Copyright © Materials Research Society 2012

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