球磨态La-Y-Mg-Ni合金的显微组织和储氢性能  

Microstructure and hydrogen storage property of as-milled La-Y-Mg-Ni alloy

作　　者：张巍 赵栋梁[1] 张羊换[1,2] 郭世海[1] 祁焱[1] Wei ZHANG;Dong-liang ZHAO;Yang-huan ZHANG;Shi-hai GUO;Yan QI(Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081,China;Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-metal Resources,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]钢铁研究总院功能材料研究院,北京100081 [2]内蒙古科技大学白云鄂博共伴生矿资源高效综合利用省部共建协同创新中心,包头014010

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第12期3783-3796,共14页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51731002,51761032,51871125)。

摘　　要：为了提高La-Y-Mg-Ni合金的储氢性能,通过对铸态合金进行5~30 h的球磨,制备具有非晶和纳米晶结构的La_(1.7)Y_(0.3)Mg_(16)Ni合金,并研究显微组织对储氢性能的影响及其机理。结果表明,随着球磨时间的延长,合金的结晶度、晶粒尺寸和粒径减小,非晶相增加。纳米晶相和非晶相的双重调节作用导致储氢动力学性能先加快,后减慢。经过15 h球磨的合金具有最好的吸、放氢动力学特性,在373 K下10 min内可以吸收3.10%(质量分数)的氢气,其放氢活化能最低,为71.2 k J/mol。球磨不同时间的合金的热力学性能的变化很小,球磨15 h后合金的放氢焓变最低,为72.9 k J/mol。To improve the hydrogen storage property of La-Y-Mg-Ni alloy,the La_(1.7)Y_(0.3)Mg_(16)Ni alloys with an amorphous and nanocrystalline structure were prepared by ball milling the as-cast alloy for 5-30 h.The effects of microstructure on hydrogen storage property and its mechanism were analyzed.The results show that with prolonging milling time,the crystallinity,grain size and particle size decrease and the amorphous phases increase.The dual regulation of the nanocrystalline and amorphous phases results in the hydrogen storage kinetic property increasing at first and declining later.The 15 h-milled alloy gets the best hydrogenation and dehydrogenation kinetic property,which can absorb 3.10 wt.% hydrogen gas in 10 min at 373 K and has the lowest dehydrogenation activation energy of 71.2 kJ/mol.The thermodynamic property of the alloys milled for different time shows a little change,and the 15 h-milled alloy has the lowest dehydrogenation enthalpy change of 72.9 kJ/mol.

关 键 词：镁基合金 球磨 显微组织 晶粒细化 纳米晶 非晶相 储氢动力学 

分 类 号：TG139.7[一般工业技术—材料科学与工程]