期刊
JOURNAL OF RARE EARTHS
卷 37, 期 12, 页码 1305-1311出版社
ELSEVIER
DOI: 10.1016/j.jre.2019.03.017
关键词
La-Mg-Ni electrode alloys; Melt-spinning; Annealing; Single phase microstructure; Electrochemical properties; Rare earths
资金
- National Natural Science Foundation of China [51761032, 51501095]
- University Foundation of Inner Mongolia [NJZZ18142]
- Natural Science Foundation of Inner Mongolia [2018MS05040]
La-Mg-Ni alloys were prepared by melt-spinning with different cooling rates and followed by annealing. Elevation of the cooling rate leads to refinement of the grains size and increasing of the abundance of LaNi5. Annealing is favorable to formation of the A(2)B(7)-type phase and promotes the discharge capacity, cycling stability and high rate discharge ability of the as-spun alloys. Phase constitution of the annealed alloys is found to be closely related to the microstructure of the as-spun alloys. A single phase A(2)B(7)-type microstructure is obtained in the annealed alloy which is attributed to the lower abundance of the LaNi5 of the original alloy spun with lower cooling rate. Formation of the single phase A(2)B(7)-type microstructure is also ascribed to the isolated and homogeneous distribution of the morphology of the as-spun alloy. The single phase alloy presents higher discharge capacity and better cycling stability compared with other annealed alloys. (C) 2019 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
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