High glass forming ability correlated with microstructure and hydrogen storage properties of a Mg―Cu―Ag―Y glass

Thermal characterization of an as-cast Mg sub(54)Cu sub(28)Ag sub(7)Y sub(11) bulk metallic glass revealed that this alloy exhibits excellent glass forming ability. High-resolution X-ray diffraction study and transmission electron microscopy show that heating and isothermal annealing treatment resul...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-06, Vol.39 (17), p.9230-9240
Main Authors: REVESZ, A, KIS-TOTH, A, VARGA, L. K, LABAR, J. L, SPASSOV, T
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
ANNEALING PROCESSES
Applied sciences
COPPER MAGNESIUM ALLOYS
Correlation
CRYSTAL STRUCTURE
Crystallization
Energy
Exact sciences and technology
Forming
Fuels
Glass
GLASSES
HYDROGEN
Hydrogen storage
Metallic glasses
MICROSTRUCTURES
STORAGE
Volume fraction
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Summary:Thermal characterization of an as-cast Mg sub(54)Cu sub(28)Ag sub(7)Y sub(11) bulk metallic glass revealed that this alloy exhibits excellent glass forming ability. High-resolution X-ray diffraction study and transmission electron microscopy show that heating and isothermal annealing treatment results in the nucleation of nanocrystals of several phases. The average size of these nanocrystals ( similar to 15-20 nm) only slightly varies with prolonged annealing, only their volume fraction increases. High-pressure calorimetry experiments indicate that the as-cast fully amorphous alloy exhibits the largest enthalpy of hydrogen desorption, compared to partially and fully crystallized states. Since the fully crystallized alloy does not desorb hydrogen, it is assumed that hydrogen storage capacity correlates only with the crystalline volume fraction of the partially crystallized Mg sub(54)Cu sub(28)Ag sub(7)Y sub(11) BMG and additional parameters (crystalline phase selection, crystallite size, average matrix concentration) do not play a significant role.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.03.214