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La替代Mg对Mg_2Ni型合金电化学贮氢性能的影响

ISSN号：1005-8192
期刊名称：《金属功能材料》
时间：0
分类：TG139.7[金属学及工艺—合金;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[1]内蒙古科技大学省部共建国家重点实验室培育基地,包头014010, [2]钢铁研究总院功能材料研究所,北京100081
相关基金：国家自然科学基金项目（50871050和50961009）; 内蒙古自治区自然科学基金重大项目（2010ZD05）

作者：丁晓霞[1,2], 刘晓刚[1,2], 陈乐乐[1,2], 侯忠辉[1], 张国芳[1,2], 张羊换[1,2]

关键词： Mg2Ni型合金, 快淬, La替代Mg, 电化学贮氢, Mg2Ni-type alloy, rapid quenching, substituting Mg with La, electrochemical hydrogen storage

中文摘要：

用快淬工艺制备了纳米晶和非晶Mg2Ni型Mg2-xLaxNi（x=0,0.2,0.4,0.6）贮氢电极合金,获得长度连续,厚度约为30μm,宽度约为25mm的薄带。用XRD、SEM和HRTEM分析了快淬合金薄带的微观结构,测试了合金薄带的电化学性能及电化学交流阻抗谱（EIS）。快淬无La合金具有典型的纳米晶结构,但快淬含La合金显示了以非晶相为主的结构,表明La替代Mg2Ni中Mg元素提高了合金的非晶形成能力。当x≤0.2时,La替代Mg不改变合金的主相Mg2Ni,但出现少量的LaMg3及La2Mg17相。当La替代量x≥0.4时,合金的主相改变为（La,Mg）Ni3＋LaMg3。铸态合金的放电容量随La含量的增加单调递增,快淬态合金的放电容量随La含量的变化而出现极大值。La替代Mg显著地提高了铸态及快淬态合金的循环稳定性。

英文摘要：

The rapid quenching technique is applied to the preparation of the nanocrystalline and amorphous Mg2Ni-type alloys with nominal compositions of Mg2-xLaxNi（x=0,0.2,0.4,0.6）.The as-quenched alloy ribbons with a continuous length,a thickness of about 30 μm and a width of about 25 mm were successfully obtained.The structures of the as-spun alloy ribbons were characterized by XRD,SEM and HRTEM.The electrochemical hydrogen storage performances and the electrochemical impedance spectra（EIS） of the as-quenched alloy ribbons were tested.The results show that the as-quenched La-free alloy holds a typical nanocrystalline structure,whereas the as-quenched alloys substituted by La exhibit an evident amorphous structure,meaning the substitution of La for Mg facilitates the glass formation of the Mg2Ni-type alloy.For x≤0.2,the substitution of La for Mg leads to forming small amount of secondary phases LaMg3 and La2Mg17 without changing major phase Mg2Ni.The major phase of the alloys are changed into the（La,Mg）Ni3＋LaMg3 phases by increasing La content to x≥0.4.The discharge capacity of the as-cast alloy always increases with rising amount of La substitution,whereas the discharge capacity of the as-quenched alloy has a maximum value with the incremental variation of La content.Furthermore,the substitution of La for Mg significantly enhances the cycle stability of the as-cast and quenching alloys.

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