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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.8 (2002)  >  pp.1952-1956

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Thermal Stability and Mechanical Strength of Bulk Glassy Ni-Nb-Ti-Zr Alloys

Akihisa Inoue1), Wei Zhang2) and Tao Zhang1)
1) Institute for Materials Research, Tohoku University
2) Inoue Superliquid Glass Project, ERATO, Japan Science and Technology Corporation

Bulk glassy Ni-based alloys with high fracture strength exceeding 2700 MPa were prepared in Ni60Nb40−xyTixZry system by copper mold casting. The glassy alloys with distinct glass transition were obtained in the wide composition range from 0 to 35%Ti and 0 to 30%Zr and the largest supercooled liquid region before crystallization was 76 K for Ni60Nb15Ti10Zr15. The maximum diameter was 2 mm for Ni60Nb20Ti15Zr5 and the glass transition temperature (Tg), crystallization temperature (Tx) and reduced glass transition temperature (TgTl) of the bulk glassy alloy were 841 K, 898 K and 0.61, respectively. The Young’s modulus (E), compressive fracture strength (σc,f) and compressive fracture elongation (εc,f) were 156 GPa, 2770 MPa and 2.4%, respectively, for the bulk alloy. There is a tendency for fracture strength to increase with increasing E, Tg and liquidus temperature (Tl). It is therefore interpreted that the high strength is due to strong bonding nature among the constituent elements.

nickel-based alloy, melt spinning, thermal properties, casting, bulk glassy alloy, mechanical properties

Received: February 20, 2002
Accepted: April 17, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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