【摘 要】
：
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 La4MgNi17.5M
【机 构】
：
Jiangsu University of Science and Technology,Zhenjiang 212003, China
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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 CeCus-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 (S100) of the alloy increased from 54.82％ (as-cast) to 82.29％ (25 m/s).Nevertheless,the maximum discharge capacity (Cmax) and high-rate dischargeability gradually decreased.
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