Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第5期    总第74期    2005年5月

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文章编号: 1004-0609(2005)05-0705-06
铸态及快淬态La-Mg-Ni系(PuNi3型)
贮氢合金的循环稳定性
张羊换1, 2, 董小平1, 王国清2, 郭世海2, 任江远1, 王新林2

( 1. 内蒙古科技大学 材料学院, 包头 0140101;
2. 钢铁研究总院 功能材料研究所, 北京 100081
)

摘 要: 用铸造及快淬工艺制备了La-Mg-Ni系(PuNi3型)La2Mg(Ni0.85Co0.15)9Bx (x=0~0.2)贮氢合金, 分析测试了铸态及快淬态合金的微观结构与循环稳定性, 研究了硼及快淬工艺对合金微观结构及电化学循环稳定性的影响。 结果表明, 铸态合金具有多相结构, 包括 (La, Mg)Ni3相和LaNi5相, 一定量的LaNi2相及微量的Ni2B相, 经大于15m/s淬速快淬处理后Ni2B相消失, 并且其它相的相对量随淬速的变化而变化。 硼的加入提高了铸态及快淬态合金的循环稳定性, 但其作用机理完全不同。 合金的循环寿命随淬速的增加而增加, 但快淬工艺对La-Mg-Ni系贮氢合金循环寿命的改善非常有限。

 

关键字:  La-Mg-Ni系贮氢合金; 快淬工艺; 微观结构; 循环稳定性

Cycling stability of La-Mg-Ni system 
(PuNi3-type) hydrogen storage alloys prepared by casting and rapid quenching
ZHANG Yang-huan1,2, DONG Xiao-ping1, WANG Guo-qing2,
GUO Shi-hai2, REN Jiang-yuan1, WANG Xin-lin2

1. School of Materials, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. Department of Functional Materials Research, Central Iron and Steel Research Institute, Beijing 100081, China

Abstract: The La-Mg-Ni system (PuNi3-type) hydrogen storage alloys La2Mg(Ni0.85Co0.15)9Bx (x = 0, 0.1, 0.2) were prepared by casting and rapid quenching. The microstructures and electrochemical cycling stabilities of the as-cast and quenched alloys were determined and measured. The effects of boron content and quenching rate on the microstructures and electrochemical cycling stabilities of the alloys were investigated. The results show that the as-cast and quenched alloys are composed of the (La, Mg)Ni3 phase (PuNi3-type structure), the LaNi5 phase and the LaNi2 phase. A trace of the Ni2B phase exists in the as-cast alloys containing boron, and after the as-cast alloys are quenched when quenching rate is more than 15m/s, the Ni2B phase in the alloys nearly disappears. The relative amount of each phase in the alloys changes with the variety of the quenching rate. The addition of boron enhances the cycle stability of the as-cast and quenched alloys, but the mechanism is completely different. The cycle lives of the as-quenched alloys increase with the increasing quenching rate, but the improvement of the rapid quenching treatment on the cycling stability of La-Mg-Ni system hydrogen storage alloys is very limited.

 

Key words: La-Mg-Ni system electrode alloy; rapid quenching technology; microstructure; cycling stability

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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