董小平,刘生龙,杨丽颖,王翠表,陈家熠,张羊换

• 1:河北大学质量技术监督学院
• 2:内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室

摘要(Abstract)：

为了改善A2B7型La0.8Mg0.2Ni3.5Co0.2合金的电化学性能,采用熔体快淬技术制备了合金。用XRD、SEM分析了合金的微观结构,用电化学方法测试了合金的电化学性能。结果表明,快淬后,合金具有多相结构,包括两个主相(La,Mg)Ni5及(La,Mg)2(Ni,Co)7和残留相LaNi2.28相,快淬使合金的微观应变增加,柱状晶区域面积较大,合金的晶粒明显细化。快淬使合金的放电容量、平台中值电压降低,电化学循环稳定性提高。

关键词(KeyWords)： 熔体快淬;A2B7型稀土镁镍基合金;结构;电化学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51371094);; 河北省高等学校科学研究计划(Z2012168);; 保定市科学计划研究与发展指导计划项目(12ZG018)

作者(Author): 董小平,刘生龙,杨丽颖,王翠表,陈家熠,张羊换

DOI: 10.13289/j.issn.1009-6264.2014.04.001

参考文献(References)：

• [1]Hayakawa H,Akiba E,Gotoh M,et al.Crystal structures of La-Mg-Nix(x=3~4)system hydrogen storage alloys[J].Materials Transactions,2005,46(6):1393-1401.
• [2]董小平,杨丽颖,王青,等.热处理后La0.80Mg0.20Ni3.70合金循环容量衰减的机理[J].材料热处理学报,2012,33(12):19-24.DONG Xiao-ping,YANG Li-ying,WANG Qing,et al.Cyclic capacity decay mechanism of La0.80Mg0.20Ni3.70alloy after annealing treatment[J].Transactions of Materials and Heat Treatment,2012,33(12):19-24.
• [3]Yuan H P,Zou Z Y,Li Z N,et al.Effect of particle size on the performance of rare earth-Mg-Ni-based hydrogen storage alloy electrode[J].International Journal of Hydrogen Energy,2013,38(19):7881-7887.
• [4]Jiang W Q,Qin C S,Zhu R R,et al.Annealing effect on hydrogen storage property of Co-free La1.8Ti0.2MgNi8.7Al0.3alloy[J].Journal of Alloys and Compounds,2013,565:37-43.
• [5]Hu W K,Deny R V,Nwakwuo C C,et al.Annealing effect on phase composition and electrochemical properties of the Co-free La2MgNi9anode for Nimetal hydride batteries[J].Electrochimica Acta,2013,96:27-33.
• [6]Ni C Y,Zhou H Y,Shi N L,et al.Electrochemical performances of Mm0.7MgxNi2.58Co0.5Mn0.3Al0.12(x=0,0.3)hydrogen storage alloys in the temperature range from 238 to 303 K[J].Electrochimica Acta,2012,59:237-244.
• [7]崔大田,王志法.快速凝固新型Au-Ag-Ge合金薄带的制备[J].材料热处理学报,2010,31(1):40-43.CUI Da-tian,WANG Zhi-fa.Preparation of rapidly solidified new type Au-Ag-Ge alloy ribbon[J].Transactions of Materials and Heat Treatment,2010,31(1):40-43.
• [8]向青青,周彼德,李荣德.快速凝固过程中熔液自旋工艺的比较[J].特种铸造及有色合金,2000,3:46-49.XIANG Qing-qing,ZHOU Bi-de,LI Rong-de.Comparation of molten spinning technology in rapid solidification process[J].Special Casting and Nonferrous Alloys,2000,3:46-49.
• [9]崔忠祈,谭耀春.金属学与热处理[M].第2版.北京:机械工业出版社,2013.01.
• [10]Wu Z,Yang F S,Bao Z W,et al.Improvement in hydrogen storage characteristics of Mg-based metal hydrides by doping nonmetals with high electronegativity:A first-principle study[J].Computational Materials Science,2013,78:83-90.
• [11]Liu Y F,Cao Y H,Pan H G,et al.Rare earth-Mg-Ni-based hydrogen storage alloys as negative electrode materials for Ni/MH batteries[J].Journal of Alloys and Compounds,2011,509(3):675-686.
• [12]Nakano H,Wakao S,Shimizu T.Correlation between crystal structure and electrochemical properties of C14 Laves-phase alloys[J].Journal of Alloys and Compounds,1997,253-254:609-612.

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