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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.708-711

MATERIALS TRANSACTIONS
<<Previous article Vol.43  No.4 (2002)   pp.708 - 711 Next article>>

New Bulk Glassy Ni-Based Alloys with High Strength of 3000 MPa

Tao Zhang1) and Akihisa Inoue1)
1) Institute for Materials Research, Tohoku University

New Ni-based bulk glassy alloys with high strength and good ductility were synthesized for the first time in Ni–Nb–Ti–Zr base system by the mold-clamp or copper mold casting method. The bulk glassy Ni53Nb20Ti10Zr8Co6Cu3 alloy has a rod shape with diameters up to 3 mm or a sheet shape with thickness up to 1 mm. The glass transition temperature (Tg) and the supercooled liquid region defined by the difference between Tg and crystallization temperature (Tx), ΔTx(=TxTg) are 846 and 51 K, respectively, and no distinct change in Tg, Tx and ΔTx with sample diameter is seen. The Ni-based alloy is located in the vicinity of eutectic composition and has a high reduced glass transition temperature (TgTm) of 0.67. The Ni-based bulk glassy alloy also exhibits good mechanical properties, i.e., tensile fracture strength of 2700 MPa, tensile fracture elongation of 2.1%, compressive fracture strength of 3010 MPa and compressive fracture elongation of 2.4%. It is noticed that the tensile fracture strength is the highest among all bulk glassy alloys developed up to date. The success of synthesizing the new Ni-based bulk glassy alloy with good mechanical properties is promising for future uses as a new type of high strength material.


Keyword:
nickel base alloy, bulk glassy alloy, glass transition, supercooled liquid region, reduced glass transition temperature, high strength, large elongation

Received: November 21, 2001
Accepted: February 25, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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