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Formation, corrosion behavior, and mechanical properties of bulk glassy Zr–Al–Co–Nb alloys

Published online by Cambridge University Press:  31 January 2011

Shujie Pang ,
Tao Zhang ,
Katsuhiko Asami  and
Akihisa Inoue
Shujie Pang
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Tao Zhang
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Katsuhiko Asami
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Abstract

Bulk glassy Zr55Al20–xCo25Nbx (x = 0 to 5 at.%) alloys with critical diameters of 2.5–5 mm and supercooled liquid region of 48–75 K were produced by copper-mold casting. These alloys were spontaneously passivated in 3 mass% NaCl and 1 N H2SO4 solutions. The addition of Nb to the alloy enhanced the pitting corrosion resistance in the NaCl solution and enabled the open-circuit potential in the H2SO4 solution. Zr- and Al-enriched passive films formed on the bulk glassy Zr–Al–Co–Nb alloys exposed to air and on those immersed in the solutions. The increase in Nb content of the alloys resulted in an increase in Zr and Nb concentrations and a decrease in Al concentration of the passive film. The Vickers hardness, Young's modulus, compressive fracture strength, fracture strain, and plastic strain of the bulk glassy Zr–Al–Co–Nb alloys were 550, 98 GPa, 2100 MPa, 2.9%, and 0.9%, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 7 , July 2003 , pp. 1652 - 1658
Copyright
Copyright © Materials Research Society 2003

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