MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Thermal Stability and Devitrification Behavior of Ternary Ni-Nb-Ti and Quaternary Glassy Alloys Containing Noble Metals
Takeyuki ShimadaDmitri V. LouzguineJunji SaidaAkihisa Inoue
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2005 Volume 46 Issue 3 Pages 675-680

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Abstract

The devitrification of Ni60Nb25Ti15 glassy alloy has been investigated by X-ray diffraction (XRD), differential scanning and isothermal calorimetry and transmission electron microscopy (TEM). The primarily crystallized phase was a cubic Ni(Ti,Nb) phase with a lattice parameter of 0.293 nm. A Ni3Nb phase follows precipitation of the Ni(Ti,Nb) phase. The cubic Ni(Ti,Nb) phase undergoes partial transformation to Ni4Ti3 phase. These cubic Ni(Ti,Nb) phases disappear at the equilibrium conditions.
The supercooled liquid region (ΔTx) of the Ni60Nb25Ti15 glassy alloy was extended to 64 K with the addition of Pt. The Ni55Nb25Ti15Pt5 glassy alloy rods with diameters up to 2 mm were formed by mold casting. Pt and the other noble metals additions do not alter devitrification of Ni60Nb25Ti15 glassy alloy.

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© 2005 The Japan Institute of Metals and Materials
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