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

被引：23

作者：

Revesz, A. ^{[1
]}

Kis-Toth, A. ^{[1
]}

Varga, L. K. ^{[2
]}

Labar, J. L. ^{[3
]}

Spassov, T. ^{[4
]}

机构：

[1] Eotvos Lorand Univ, Dept Mat Phys, H-1518 Budapest, Hungary

[2] Hungarian Acad Sci, Res Inst Solid State Phys & Opt, H-1525 Budapest, Hungary

[3] Hungarian Acad Sci, Res Ctr Nat Sci, Inst Tech Phys & Mat Sci, H-1525 Budapest, Hungary

[4] Univ Sofia, Dept Chem, Sofia 1164, Bulgaria

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2014年 / 39卷 / 17期

关键词：

H-storage; Bulk metallic glass; Amorphous; Mg-based; Glass forming ability; IN-SITU SYNCHROTRON; X-RAY-DIFFRACTION; MELT-SPUN; THERMAL-STABILITY; SUPERCOOLED LIQUID; PARTICLE-SIZE; TRANSITION; KINETICS; ALLOYS; STRENGTH;

D O I：

10.1016/j.ijhydene.2014.03.214

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thermal characterization of an as-cast Mg54Cu28Ag7Y11 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 Mg54Cu28Ag7Y11 BMG and additional parameters (crystalline phase selection, crystallite size, average matrix concentration) do not play a significant role. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：9230 / 9240

页数：11

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