Effect of Annealing Time on Structure and Gaseous Hydrogen Absorption and Desorption Properties of LaMgNi3.9Mn0.2 Alloy AITranslate

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3Ting-ting Zhai,Ze-ming Yuan,Feng Hu,Long Luo,Yong-zhi Li,Hao Sun,Dian-chen Feng,Yang-huan Zhang.Influence of melt spinning and annealing treatment on structures and hydrogen storage thermodynamic properties of La0.8Pr0.2MgNi3.6Co0.4 alloy[J].钢铁研究学报：英文版,2020,27(1):114-120. 被引量：1

5Yang-Huan Zhang,Gang Huang,Ze-Ming Yuan,Shi-Hai Guo,Yan Qi,Dong-Liang Zhao.Electrochemical hydrogen storage behaviors of as-cast and spun RE-Mg-Ni-Co-Al-based AB2-type alloys applied to Ni-MH battery[J].稀有金属：英文版,2020,0(2):181-192. 被引量：1

9郑坤,杨倩,杨洋,罗永春.La0.7Y0.3Ni3.4-xMnxAl0.1(Х=0~0.5)储氢合金微观结构和电化学性能[J].金属功能材料,2020,27(1):16-23. 被引量：6

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Chinese Library Classification Number:TG138.1[一般工业技术—材料科学与工程]

Citation Information:

In order to study the effect of annealing time on structure and gaseous hydrogen absorption and desorption properties of LaMgNi3.9Mn0.2 alloy,the phase and microstructure of the alloy were tested by XRD and SEM,and the hydrogen absorption and desorption kinetics plot was tested by semi-automatic Siever′s method.The experimental results show that with the increase of annealing time,the content of main phase LaMg(NiMn)4 decreases,while the content of(La,Mg)(NiMn)5 increases.The surface of as-cast and annealed alloys is mainly composed of columnar crystals with different sizes,which has obvious structural heredity.With the increase of annealing time,the content differences of La,Mg and Ni in the columnar crystal region of the alloy decrease,which makes the element distribution more uniform.Mn element disappears in the columnar crystal intergranular region of the alloy annealed for 15 h and 20 h.After the first hydrogen absorption of as-cast and annealed alloys,the corresponding maximum hydrogen absorption is reached.Therefore,the annealing time has no effect on the activation performance of the alloy,but has a significant effect on the maximum hydrogen absorption and the saturated hydrogen absorption and desorption of the alloy.With the increase of annealing time,the maximum hydrogen absorption and saturated hydrogen absorption and desorption of the alloy decrease,but the hydrogen absorption and desorption saturation increases firstly and then decreases,and that of the alloy annealed for 15 h is relatively high.