Hydrogenation of Zr-Cu-Al-Ni-Pd metallic glasses by electrochemical means

被引：10
作者：
Ismail, N. [1 ]
El-Meligi, A. A. [1 ]
Uhlemann, M. [2 ]
Gebert, A. [2 ]
Eckert, J. [2 ]
Schultz, L. [2 ]
机构：
[1] Natl Res Ctr, Dept Phys Chem, Cairo, Egypt
[2] Inst Met Werkstoffe, IFW Dresden, D-01171 Dresden, Germany
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 480卷 / 02期
关键词：
Electrochemical hydrogenation; Thermal desorption; Thermal stability; Zr-based metallic glasses; AMORPHOUS ZR65CU17.5NI10AL7.5; FORMING ABILITY; POWDERS; ALLOYS; ABSORPTION; OXIDATION; GENESIS; OXYGEN; NEON;
D O I：
10.1016/j.jallcom.2009.01.138
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：
Amorphous materials of Zr-Cu-Ni-Al systems have shown attractive electrochemical hydrogen absorption properties. A comparison between Zr(60)Cu(15)Al(10)Ni(10)Pd(5) and Zr(65)Cu(17.5)Al(7.5)Ni(10) reveals that the palladium (Pd) increases the hydrogen absorption capacity. Charging melt-spun Zr(60)Cu(15)Al(10)Ni(10)Pd(5) ribbons electrochemically to different hydrogen-to-metal (H/M) ratios and following the effusion of hydrogen by thermal desorption analysis (TDA) reveals hydrogen desorption from interstitial sites of high energy levels at temperatures below 630 K. Zirconium hydrides are formed above 630 K. At higher temperatures partial desorption of hydrogen occurs. The thermal stability observed with differential scanning calorimetry (DSC) of the amorphous phase has been significantly deteriorated by hydrogen absorption. After hydrogenation, the crystallization behaviour shows suppression of the characteristic quasicrystalline phase and depends on the hydrogen content. Therefore, at low hydrogen concentrations H/M = 0.3, Cu and/or Cu-rich phases are primarily formed while at high hydrogen concentrations H/M >= 0.9 Zr-hydride phase(s) are mainly formed. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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页码：321 / 324
页数：4
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