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Journal of Materials Engineering and Performance

Erschienen in:

01.03.2013

Structure and Electrochemical Properties of Rapidly Quenched Mm_0.3Ml_0.7Ni_3.55Co_0.75Mn_0.4Al_0.3 Hydrogen Storage Alloy

verfasst von: Xiao Tian, Xiangdong Liu, Zhanquan Yao, Sufang Yan

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 3/2013

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Abstract

The as-cast Mm_0.3Ml_0.7Ni_3.55Co_0.75Mn_0.4Al_0.3 alloy has been treated using rapid-quenching technique at different quenching speeds to improve the electrochemical hydrogen storage properties of the alloys. The morphologic and microstructural characterizations of alloys were studied using x-ray diffraction and transmission electron microscopy. It is observed that the quenched alloy is composed of two main phases, LaNi₅ and LaNi₃, and one minor phase of La₂Ni₃. The microstructures of the alloys vary with the quenching speeds, as well as contain microcrystalline, nanocrystalline, and amorphous structures. The electrochemical hydrogen storage properties were measured using a battery test system. The results indicate that the discharge capacity of the alloy increases initially and then decreases with the rising quenching speeds. The quenched alloy at a speed of 15 m/s exhibits the maximum discharge capacity (388 mAh/g), which is much higher than that of the AB₅-type rare earth-based hydrogen storage alloy reported in previous studies. However, the stability of the electrochemical cycle of the quenched alloy exhibits inverse trends compared with the discharge capacity. The best electrochemical cyclic stability of the quenched alloy can be obtained at a speed of 25 m/s.

Vorheriger Artikel Characterization of Properties in Friction Welded Stainless Steel and Copper Materials

Nächster Artikel Microstructure and Corrosion Aspects of Dissimilar Joints of Zircaloy-4 and 304L Stainless Steel

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Titel: Structure and Electrochemical Properties of Rapidly Quenched Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3 Hydrogen Storage Alloy
verfasst von: Xiao Tian
Xiangdong Liu
Zhanquan Yao
Sufang Yan
Publikationsdatum: 01.03.2013
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 3/2013
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-012-0316-y

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