Hydriding and dehydriding kinetics of melt spun nanocrystalline Mg20Ni10-xCux (x = 0-4) alloys

• 作者: Bao-Wei Li Dong-Liang Zhao Hui-Ping Ren Shi-Hai Guo Xin-Lin Wang Yang-Huan Zhang
• 来源期刊: 自然科学期刊(英文)
• 学科: 工学
• 关键词: Mg2Ni-Type Alloy Substituting Ni with Cu MELT SPINNING HYDRIDING and Dehydriding
• 年，卷（期）: 2010,（1）
• 页码范围: 18-25
• 页数: 8页
• 分类号: TG14

摘要

The nanocrystalline Mg2Ni-type electrode alloys with nominal compositions of Mg20Ni10-xCux (x = 0, 1, 2, 3, 4) were synthesized by melt-spinning technique. The microstructures of the alloys were characterized by XRD, SEM and HRTEM. The hydrogen absorption and desorption kinet-ics of the alloys were measured using an auto-matically controlled Sieverts apparatus. The re- sults show that all the as-spun alloys hold ty- pical nanocrystalline structure. The substitution of Cu for Ni does not change the major phase Mg2Ni but it leads to the formation of the sec-ondary phase Mg2Cu. The hydrogen absorption capacity of the alloys first increases and then decreases with rising Cu content, but the hy-drogen desorption capacity of the alloys mono- tonously grows with increasing Cu content. The melt spinning significantly improves the hydro- genation and dehydrogenation capacities and kinetics of the alloys.