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Phase Separation and Crystallization in the Bulk Amorphous Alloy Zr41Ti14Cu12.5Ni10Be22.5

Published online by Cambridge University Press:  21 February 2011

M.-P. Macht ,
N. Wanderka ,
A. Wiedenmann ,
H. Wollenberger ,
Q. Wei ,
S.G. Klose ,
A. Sagel  and
H.J. Fecht
M.-P. Macht
Affiliation:
Hahn -Meitner-Institut Berlin, Glienickerstr.100, D-14109 Berlin, FRG
N. Wanderka
Affiliation:
Hahn -Meitner-Institut Berlin, Glienickerstr.100, D-14109 Berlin, FRG
A. Wiedenmann
Affiliation:
Hahn -Meitner-Institut Berlin, Glienickerstr.100, D-14109 Berlin, FRG
H. Wollenberger
Affiliation:
Hahn -Meitner-Institut Berlin, Glienickerstr.100, D-14109 Berlin, FRG
Q. Wei
Affiliation:
University Potsdam, Inst.Berufspädagogik, D-14109-Golm, FRG
S.G. Klose
Affiliation:
Technical University Berlin, Institute of Metals Research, Hardenbergstr. 36 PN 2–3, D-10623 Berlin
A. Sagel
Affiliation:
Technical University Berlin, Institute of Metals Research, Hardenbergstr. 36 PN 2–3, D-10623 Berlin
H.J. Fecht
Affiliation:
Technical University Berlin, Institute of Metals Research, Hardenbergstr. 36 PN 2–3, D-10623 Berlin
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Abstract

The decomposition and crystallization above the glass temperature of the bulk metallic glass Zr41Ti14Cu12.5Ni10Be22.5 and the crystallization during solidification of the melt were investigated by means of different analytical methods, including Transmission Electron Microscopy (TEM), Small Angle Neutron Scattering (SANS), Field Ion Microscopy with Atom Probe (FIM/AP).

Dependent on the thermal history these phase transitions lead to different phases and different microstructures of the alloy. During annealing above the glass tremperature the decomposition of the alloy into two supercooled liquid phases is observed by the formation of nanosized precipitates, which differ from the matrix by their Be and Ti contents. This decomposition retards significantly the subsequent crystallization, however it does not inhibit the formation of the phases which crystallize if the decomposition is bypassed by appropriate heat treatment. By stepwise crystallization a nanosized microstructure is formed consisting of three metastable phases and of stable Zr2Cu. This microstructure differ significantly from the crystalline equilibrium microstructure resulting from slow cooling of the melt. Crystallization of the amorphous alloy by very fast heating causes totally different microstructures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 375
Copyright
Copyright © Materials Research Society 1998

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References

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