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Influence of alloying elements Ni and Nb on thermal stability and corrosion resistance of Cu-based bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

C.L. Qin ,
W. Zhang ,
K. Asami ,
H. Kimura  and
A. Inoue
C.L. Qin*
Affiliation:
Japan Science and Technology Agency, Institute for Materials Research, Tohoku University, Aoba-ku, Sendai 980-8577, Japan
W. Zhang
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
K. Asami
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
H. Kimura
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
A. Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
*
a)Address all correspondence to this author. e-mail: clqin@imr.tohoku.ac.jp
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Abstract

Bulk metallic glasses (BMGs) with critical diameters of 2.5–3 mm were synthesized in the (Cu0.6Zr0.3Ti0.1)100−x−yNiyNbxsystem by copper-mold casting. These alloys exhibit a large supercooled liquid region (ΔTx) of 40–60 K and a high reduced glass transition temperature (Tg/Tl) of 0.60–0.61, indicating high glass-forming ability and high thermal stability of the supercooled liquid. The corrosion rates in 1 N HCl and 3 mass% NaCl solutions significantly decrease by simultaneous alloying with Ni and Nb elements. The addition is also effective in raising the pitting potential in chloride solutions. The addition of Ni and Nb is favorable for the alloys in forming Zr-, Ti-, and Nb-enriched highly protective surface films in HCl and NaCl solutions.

Keywords

AmorphousCorrosionX-ray photoelectron spectroscopy (XPS)

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Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1710 - 1717
Copyright
Copyright © Materials Research Society2007

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References

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