Microstructural evolution of melt-spun Mg-10Ni-2Mm hydrogen storage alloy  

快淬Mg-10Ni-2Mm储氢合金的组织演化(英文)

作　　者：武英[1,2,3] 邢娜[1,4] 卢志超[1] 韩伟[1] 周少雄[1] J.K.SOLBERG V.A.YARTYS 

机构地区：[1]中国钢研科技集团有限公司安泰科技股份有限公司,北京100081 [2]挪威科技大学材料技术系 [3]挪威能源技术研究所 [4]内蒙古工业大学材料科学与工程学院,呼和浩特100051

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第1期121-126,共6页中国有色金属学报（英文版）

基　　金：Project(2007DFA50590)supported by the International S&T Cooperation Projects the Norwegian Research Council for financial support

摘　　要：The microstructural evolution of a Mg-10Ni-2Mm（molar fraction,%）（Mm=Ce,La-rich mischmetal） hydrogen storage alloys applied with various solidification rates was studied.The results show that the grain size of melt-spun ribbon is remarkably reduced by increasing the solidification rate.The microcrystalline,nanocrystalline and amorphous microstructures are obtained by applying the surface velocities of the graphite wheel of 3.1,10.5 and 20.9 m/s,respectively.By applying the surface velocity of the graphite wheel of 3.1 m/s,the melt-spun specimen obtains full crystalline with a considerable amount of coarse microcrystalline Mg and Mg2Ni except for some Mm-rich particles.The amount of nanocrystalline phases significantly increases with increasing the surface velocity of the wheel to 10.5 m/s,and the microstructure is composed of a large amount of nanocrystalline phases of Mg and Mg2Ni particles.A mixed microstructure containing amorphous and nanocrystalline phases is obtained at a surface velocity of the wheel of 20.9 m/s.The optimal microstructure with a considerable amount of nanocrystalline Mg and Mg2Ni in an amorphous matrix is expected to have the maximum hydrogen absorption capacity and excellent hydrogenation kinetics.研究一种镁基Mg-10Ni-2Mm(摩尔分数,%)储氢合金在不同凝固速率下的组织演化。结果表明:增加凝固速率可以大幅度细化合金条带的晶粒;采用的石墨冷却轮表面速度为3.1,10.5和20.9m/s时,可以分别获得微晶、纳米晶和非晶组织;当冷却轮盘表面速度为3.1m/s时,快淬试样完全结晶化,组织中除了少量富Mm晶粒外,形成了粗大的Mg和Mg2Ni微晶;加快冷却轮盘表面速度到10.5m/s时,大量的纳米颗粒形成,组织由大量的Mg和Mg2Ni纳米晶组成;进一步加快速度到20.9m/s时,形成了包括非晶和纳米晶的混合组织。理想的组织是非晶基体上析出大量纳米晶,这样的组织有望获得最大的储氢容量和优异的吸放氢动力学。

关 键 词：hydrogen storage materials Mg-based alloys RAPID-SOLIDIFICATION MICROSTRUCTURE transmission electron microscopy 

分 类 号：TG139.7[一般工业技术—材料科学与工程]