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Thermal stability, corrosion resistance, and surface analysis of Cu–Hf–Ti–Ni–Nb bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

C.L. Qin ,
W. Zhang ,
K. Asami ,
N. Ohtsu  and
A. Inoue
C.L. Qin*
Affiliation:
World Premier International Research Center (WPI) Advanced Institute for Materials Research, Tohoku University, Aoba-ku, 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 high thermal stability and good corrosion resistance were synthesized in the (Cu0.6Hf0.25Ti0.15)100−x−yNiyNbx system by copper mold casting. The addition of Ni element causes an extension of a supercooled liquid region (ΔTx = Tx – Tg) from 60 K for Cu60Hf25Ti15 to 70 K for (Cu0.6Hf0.25Ti0.15)95Ni5. The simultaneous addition of Ni and Nb to the alloy is effective in improving synergistically the corrosion resistance in 1 N HCl, 3 mass% NaCl, and 1 N H2SO4 + 0.01 N NaCl solutions. The highly protective Hf-, Ti-, and Nb-enriched surface film is formed by the rapid initial preferential dissolution of Cu and Ni, which is responsible for the high corrosion resistance of the alloys in the solutions examined.

Keywords

AmorphousCorrosionX-ray photoelectron spectroscopy (XPS)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 2 , February 2009 , pp. 316 - 323
Copyright
Copyright © Materials Research Society 2009

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