MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
New Glassy Zr-Al-Fe and Zr-Al-Co Alloys with a Large Supercooled Liquid Region
Tao ZhangAkihisa Inoue
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2002 Volume 43 Issue 2 Pages 267-270

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Abstract

New Zr–Al–Co and Zr–Al–Fe ternary glassy alloys were found to exhibit a large supercooled liquid region above 50 K before crystallization. The largest value of the supercooled liquid region was 64 K for Zr55Al20Co25 and 50 K for Zr70Al15Fe15. The highest value of the reduced glass transition temperature (TgTl) was 0.61 for Zr55Al20Co25 and 0.60 for Zr70Al15Fe15. The use of the Zr55Al20Co25 alloy with the highest TgTl has enabled us to form bulk glassy alloy rods with diameters up to 3 mm by copper mold casting. The Young’s modulus, yield strength, compressive fracture strength, elastic elongation and fracture elongation of the Zr55Al20Co25 glassy rod are 92 GPa, 2050 MPa, 2200 MPa, 2.1% and 0.9%, respectively. The distinct plastic elongation indicates that the Zr-based bulk glassy alloy has rather a good ductile nature. The synthesis of the high-strength bulk glassy alloy in the new ternary system is expected to gain a new application field as a new type of bulk glassy alloy.

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© 2002 The Japan Institute of Metals and Materials
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