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Crystallization Pathway in the Bulk Metallic Glass Zr41.2Ti13.8Cu12.5Ni10Be22.5

Published online by Cambridge University Press:  10 February 2011

S. Schneider ,
P. Thiyagarajan ,
U. Geyer  and
W. L. Johnson
S. Schneider
Affiliation:
I. Phys. Institut and SFB 345, Universität Göttingen, 37073 Göttingen, Germany
P. Thiyagarajan
Affiliation:
Argonne National Laboratory, Argonne, IL 60439, USA
U. Geyer
Affiliation:
I. Phys. Institut and SFB 345, Universität Göttingen, 37073 Göttingen, Germany
W. L. Johnson
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA
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Abstract

A new family of multicomponent metallic alloys exhibits an excellent glass forming ability at moderate cooling rates of about 10K/s and a wide supercooled liquid region. These glasses are eutectic or nearly eutectic, thus far away from the compositions of competing crystalline phases. The nucleation of crystals from the homogeneous amorphous phase requires large thermally activated composition fluctuations for which the time scale is relatively long, even in the supercooled liquid. In the Zr41.2Ti13.8Cu12.5Ni10Be22.5 alloy therefore a different pathway to crystallization is observed. The initially homogeneous alloy separates into two amorphous phases. In the decomposed regions, crystallization probability increases and finally polymorphic crystallization occurs. The evolution of decomposition and succeeding primary crystallization in the bulk amorphous Zr41.2Ti13.8Cu12.5Ni10Be22.5 alloy have been studied by small angle neutron. Samples annealed isothermally in the supercooled liquid and in the solid state exhibit interference peaks indicating quasiperiodic inhomogeneities in the scattering length density. The related wavelengths increase with temperature according to the linear Cahn-Hilliard theory for spinodal decomposition. Also the time evolution of the interference peaks in the early stages is consistent with this theory. At later stages, X-ray diffraction and transmission electron microscopy investigations confirm the formation of nanocrystals in the decomposed regions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 295
Copyright
Copyright © Materials Research Society 1997

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