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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.12 (2001)  >  pp.2637-2640

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.12 (2001)   pp.2637 - 2640 Next article>>

Icosahedral and Amorphous Phases in Melt-Spun Ti-Zr-Ni-Cu Alloys

Limin Wang1) and Akihisa Inoue2)
1) Inoue Superliquid glass Project, ERATO, JST
2) Institute for Materials Research, Tohoku University


Structure of melt-spun Ti60Zr15Ni25−xCux (x=0, 5, 10, 15, 20 and 25) alloys and crystallization behavior of the amorphous alloys have been studied. The alloys have different structures depending on cooling rate. An icosahedral quasicrystal phase (I-phase) is formed directly upon cooling at a wheel velocity of 20 m/s for x=0–15, and at wheel velocities of 40 and 60 m/s for x=0. The high cooling rate at 60 m/s for x=5–25 causes the formation of a single amorphous phase. DSC traces of the amorphous alloys obtained during continuous heating to 1000 K showed distinct exothermic peaks. The first exothermic reaction at low temperatures for x=5, 10 and 15 is due to the precipitation of I-phase, and the following reactions at higher temperatures result from the formation of α-Ti and Ti2Ni or Ti2Cu phases. The simultaneous addition of Cu and Ni to Ti–Zr base alloys can enhance the forming ability of I-phase as well as amorphous phase.


Keyword:
titanium-based alloy, amorphous material, rapid solidification, microstructure, phase transition

Received: September 18, 2001
Accepted: November 07, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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