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快速凝固MlNi4．0 Al 0．3 Si 0．1 Fe0．6無Co貯氫電極合金的微結(jié)構(gòu)和電化學性能
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TG139.7

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國家自然科學基金重點項目資助(50131040)


Microstructure and Electrochemical Properties of the Rapid Solidified Co-Free MlNi4.0Al0.3Si0.1Fe0.6 Hydrogen Storage Electrode Alloys
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    摘要:

    研究了單輥快淬快速凝固處理對無Co貯氫電極合金MlNi4．0Al0．3Si0．1Fe0．6的微結(jié)構(gòu)和電化學性能的影響。XRD分析表明，快凝合金仍為單相CaCu5型結(jié)構(gòu)，但合金相的成分和結(jié)構(gòu)均勻性得到明顯改善。金相觀察和能譜分析顯示，鑄態(tài)合金為比較粗大的樹枝晶結(jié)構(gòu)并存在明顯的成分偏析，而快凝合金呈細小的胞狀晶結(jié)構(gòu)，合金中元素的分布趨于均勻化。電化學測試表明，快速凝固處理后合金的活化性能不變，循環(huán)穩(wěn)定性得到顯著改善，但其放電容量和高倍率放電性能有所降低。研究發(fā)現(xiàn)，快凝合金電極的交換電流密度Io以及氫在合金中的擴散系數(shù)D較鑄態(tài)合金有所減小是導致其高倍率放電性能降低的主要原因?？焖倌烫幚韺е聼oCo合金電化學性能的變化與合金的微結(jié)構(gòu)的改變有關(guān)。

    Abstract:

    In this work, the microstructure and electrochemical properties of Co-free MlNi4.0Al0.3Si0.1Fe0.6 hydrogen storage electrode alloys prepared by both conventional casting and melt-spinning processes at different solidification rate were studied comparatively. XRD analyses indicated that both as-cast and melt-spun alloys were of the CaCu5-type structure single phase, but the crystallizability and homogeneity of the melt-spun alloys were improved. The optical microscope and EDS analyses showed that the melt-spun alloys had a fine cellular structure and a more homogeneous composition than that of the as-cast alloy which had a coarse dendrite structure with noticeable composition segregation. The electrochemical tests indicated that the melt-spun alloys showed a good activation property and much better cycling stability, but lower discharge capacity and high-rate dischargeability. It is found that the decrease in both exchange current density I0 and the diffusion coefficient D of hydrogen in alloy bulk is the main reason for the degraded HRD of melt-spun alloys. The change of electrochemical properties of the alloy treated by rapid solidification process is related to the microstructure of the alloy.

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陳賢禮,雷永泉,廖彬,陳立新,張志鴻.快速凝固MlNi4．0 Al 0．3 Si 0．1 Fe0．6無Co貯氫電極合金的微結(jié)構(gòu)和電化學性能[J].稀有金屬材料與工程,2005,34(5):811~815.[Chen Xianli, Lei Yongquan, Liao Bin, Chen Lixin, Zhang Zhihong. Microstructure and Electrochemical Properties of the Rapid Solidified Co-Free MlNi4.0Al0.3Si0.1Fe0.6 Hydrogen Storage Electrode Alloys[J]. Rare Metal Materials and Engineering,2005,34(5):811~815.]
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