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Crystallization of Al-Gd-La-Ni Metallic Glasses

Published online by Cambridge University Press:  15 February 2011

T.K. Croat ,
A.K. Gangopadhyay  and
K.F. Kelton
T.K. Croat
Affiliation:
Physics Department, Washington University, Saint Louis, MO 63130, tkc@hbar.wustl.edu
A.K. Gangopadhyay
Affiliation:
Physics Department, Washington University, Saint Louis, MO 63130
K.F. Kelton
Affiliation:
Physics Department, Washington University, Saint Louis, MO 63130
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Abstract

The crystallization kinetics of Al-Gd-La-Ni metallic glasses to nanostructured phases are analyzed using differential scanning calorimetry and transmission electron microscopy. In a narrow alloy composition range near Al88Gd6La2Ni4, TEM reveals an amorphous phase separation that occurs upon annealing at low temperatures prior to crystallization. Al-enriched regions, typically 40 nm in diameter, bounded by rare-earth rich regions, are visible. Upon crystallization, α-Al forms preferentially at the interface between these phase separated regions. The relevance of this crystallization sequence to previous work in Al-RE-TM glasses and to the evolution of nanoscale microstructures common in the crystallization of other metallic glasses are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 251
Copyright
Copyright © Materials Research Society 2000

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