期刊
ACTA METALLURGICA SINICA-ENGLISH LETTERS
卷 30, 期 11, 页码 1033-1039出版社
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-017-0577-4
关键词
Hydrogen storage alloy; Melt-spun; Crystal structure; Electrochemical property
The (La4MgNi17.5Mn1.5) alloys at different melt-spun speeds were prepared by using a vacuum melt-spun furnace, and the phase structure and electrochemical properties of alloys were studied. X-ray diffraction analysis results show that melt-spun La4MgNi17.5Mn1.5 alloys are composed of CeCu5-type, Pr5Co19-type and CeNi2-type phase. As the melt-spun speed increased, the phase abundance of CeCu5-type increased, but that of Pr5Co19-type decreased. Scanning electron microscopy-energy-dispersive spectroscopy analysis results show that melt-spun treatment can refine grain and make the alloys homogenization. Electrochemical tests show that all alloys have good activation performance within four cycles. With the increase in melt-spun speed, the cycle stability (S) of the alloys was improved obviously. After 100 cycles, the retention rate (S-100) of the alloy increased from 54.82% (as-cast) to 82.29% (25 m/s). Nevertheless, the maximum discharge capacity (C-max) and high-rate dischargeability gradually decreased.
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