MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Glassy Ni-Ta-Ti-Zr(-Co) Alloys with High Thermal Stability and High Corrosion Resistance
Tao ZhangShujie PangKatsuhiko AsamiAkihisa Inoue
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2003 Volume 44 Issue 11 Pages 2322-2325

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Abstract

Glassy Ni-based alloys with high thermal stability and high corrosion resistance were synthesized in Ni-Ta-Ti-Zr(-Co) alloy system. Glassy Ni60Ta40−xyTixZry alloys exhibit supercooled liquid region exceeding 50 K in a wide composition range and the largest supercooled liquid region of 67 K was obtained at Ni60Ta20Ti15Zr5. Glassy Ni55Ta20Ti10Zr8Co7 alloy exhibits the highest thermal stability among the Ni-based glassy alloys reported up to date, which is evidenced by its high Tg and Tx of 899 K and 977 K, respectively, and a larger supercooled liquid region of 78 K. Bulk glassy Ni55Ta20Ti10Zr8Co7 alloy in a rod form with a diameter of 1 mm can be prepared by copper mold casting. The glassy Ni-Ta-Ti-Zr(-Co) alloys are spontaneously passivated with low passive current density in 1 N H2SO4 and 1 N HCl solutions and their corrosion rate was less than 0.1 μm/year in the above solutions.

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© 2003 The Japan Institute of Metals and Materials
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