The influence of the cooling rate on bulk metallic glass formation in [Mg.sub.80][Cu.sub.15][Y.sub.5] and [Mg.sub.80][Cu.sub.10][Y.sub.10]

The Mg-Cu-Y system is known to be one of the best glass formers among the various existing magnesium alloys. The compositions chosen for the current study were [Mg.sub.80][Cu.sub.15][Y.sub.5] and [Mg.sub.80][Cu.sub.10][Y.sub.10]. Different casting processes yielded four different microstructures tha...

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Bibliographic Details
Published in:Journal of materials science 2010-12, Vol.45 (23), p.6365
Main Authors: Regev, M, Rosenson, H, Koren, Z, Katz-Demyanetz, A
Format: Article
Language:English
Subjects:
Analysis
Diffraction
Electron microscopy
Magnesium alloys
Metallic glasses
X-rays
Online Access:Get full text
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Summary:The Mg-Cu-Y system is known to be one of the best glass formers among the various existing magnesium alloys. The compositions chosen for the current study were [Mg.sub.80][Cu.sub.15][Y.sub.5] and [Mg.sub.80][Cu.sub.10][Y.sub.10]. Different casting processes yielded four different microstructures that were analyzed by means of X-ray diffraction, scanning electron microscopy, high resolution scanning electron microscopy, and energy-dispersive X-ray spectroscopy chemical analysis. The different casting procedures were gravity castings of 3 mm diameter specimens into a copper mold held at different temperatures (cooled to -195°C with the aid of liquid nitrogen, held at room temperature and heated up to 300°C) and melt-spinning. Detailed microstructure study was then performed on the melt-spun specimen using transmission electron microscopy and high resolution transmission electron microscopy. The above-mentioned investigation revealed a crystalline rather than amorphous structure. The observed microstructure could not be explained on the basis of current models referring to the frequency of nucleation events.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-010-4623-0