La(Al_(1-x)Mg_x)_2合金的结构及氢化特性研究  

Structural and Hydriding Property Investigation of La(Al_(1-x)Mg_x)_2 Alloys

作　　者：侯清宇[1] 王常春[1] 张庆安[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《稀有金属》2006年第2期149-152,共4页Chinese Journal of Rare Metals

基　　金：安徽省自然科学基金资助(050440602)项目

摘　　要：通过感应熔炼方法制备了La(Al1-xMgx)2合金,并对其进行了退火处理。结果表明,当x≤0.4时,Mg部分替代Al没有改变合金的晶体结构,仍然是由单相La(Al,Mg)2构成;当x≥0.6时,合金是由La(Al,Mg)2,LaMg3和LaMg相构成。呈C15型的Laves相La(Al,Mg)2的点阵参数随着Mg替代量x的增加而增加。Mg部分替代Al的La(Al0.6Mg0.4)2合金在473K和5MPa氢压下反应5d以后,可以分解成LaH3,MgH2和La3Al11。The La（Al1-xMgx）2 alloys were prepared by induction melting and post-annealing. It is found that partial substitution of A1 by Mg does not lead to the change in crystal structure and the alloys have a single La（Al, Mg）2 phase when x≤ 0.4. However, further substituting Al by Mg results in the coexistence of multiple phases when x ≥ 0.6. The alloys consist of La（Al,Mg）2, LaMg3, and LaMg phases. The lattice parameter of the C15 type Laves phase La（Al,Mg）2 increases with the increase of x. The Mg-substituted La（Al0.6Mg0.4）2 alloy may be hydrogenated into LaH3, MgH2, and La3Al11 under a pressure of 5 MPa at 473 K for 5 d.

关 键 词：Laves相储氢合金 Rietveld拟合 晶体结构 

分 类 号：TG139.7[一般工业技术—材料科学与工程]