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Devitrification behavior around supercooled liquid region of an Al85Ni5Y8Co2 metallic glass

Published online by Cambridge University Press:  03 March 2011

H.W. Yang ,
J.Q. Wang  and
M. Ohnuma
H.W. Yang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
J.Q. Wang*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
M. Ohnuma
Affiliation:
National Institute for Materials Science, Tsukuba 305-60047, Japan
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Melt-spun and annealed Al85Ni5Y8Co2 metallic glass, with a large supercooled liquid region, were investigated by means of differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and small-angle x-ray scattering (SAXS). TEM studies revealed that the as-quenched ribbons were fully amorphous. Further, the SAXS measurements showed that no evidence for compositional inhomogeneities associated with amorphous phase separation was found in the as-quenched state and the early stage annealing prior to devitrification. The primary crystallization of this glass was characterized, intriguingly, which appeared to be proceeded with an initial thermal relaxation, then α-Al nanocrystal nucleation with a limited number, finally a high density of nanocrystals nucleation and growth.

Keywords

AmorphousTransmission electron microscopy (TEM)X-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2215 - 2223
Copyright
Copyright © Materials Research Society 2006

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