热处理温度对LaNi_(3.8)Al_(10)Mn_(0.2)合金储氢性能的影响（英文）  

Effect of Annealing Temperature on Hydrogen Storage Properties of LaNi_(3.8)Al_(1.0)Mn_(0.2) Alloy

作　　者：韩兴博[1,2] 杨小军 王培 陈伟[1,2] 林紫锋 刘国亮[1,2] 陈德敏[1] 杨柯[1] 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]中国科学院大学,北京100049 [3]中核集团四0四有限公司,甘肃兰州732850

出　　处：《稀有金属材料与工程》2016年第4期821-828,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51271176);National Basic Research Program of China(2010CB631305)

摘　　要：热处理(1173,1223,1273,1323 K)前后的LaNi_(3.8)Al_(1.0)Mn_(0.2)合金表明,该合金均由1个主相,3种第二相组成。热处理后第二相变小,分布更加弥散,第二相中LaNi_2变为LaNi相,晶胞参数和晶胞体积增大,活化性能变差,但吸放氢平台压降低,吸放氢平台的斜率和滞后变小,合金的吸氢速度显著变快,吸放氢焓变和吉布斯自由能的绝对值增大,而吸氢量未见明显变化。随着热处理温度的升高,晶胞参数和晶胞体积先增大后减小,吸放氢平台压先降低后升高,斜率先增大后减小,滞后先减小后增大,而焓变和自由能的绝对值先增大后减小,在1223 K分别达到最大和最小值,而热处理温度的升高使活化性能和动力学性能略有提升。The LaNi3.8Al10Mn0.2 hydrogen storage alloy annealed at different temperatures（T=1173, 1223, 1273, 1323 K） was investigated to examine the effect of annealing temperature on the crystal structure, the activation and the hydrogen absorption/desorption performance. It is found that the non-CaCu5 phases becomes tinier and more dispersive after annealing. All the alloys consist of the same matrix phase with CaCu5 type structure. Although it is more difficult to activate the annealed alloy than the as-cast alloy, the activation becomes easier with the increase of annealing temperature for the annealed alloy. The plateau pressure decreases at first with the increase of annealing temperature, when T≤1223 K and then increases. Changes in both the lattice strain and the pressure plateau slope factor of S f in the alloys show the same trends with that of the annealing temperature, exhibiting a maximum at T=1223 K. It is also found that the absolute value of the enthalpy increases with the increase of annealing temperature, when T≤1223 K and then decreases, showing the same change trend as that of the cell volume. Moreover, the pulverization resistance and kinetics of the alloy are improved by annealing. The pulverization resistance is weakened at first with the increase of annealing temperature when T≤1223 K and then increases, but the kinetics of the alloy is almost not influenced by the annealing temperature.

关 键 词：储氢合金 热处理 金属氢化物 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TG156[金属学及工艺—合金]