高能球磨Mg-Zr-Ni合金组织演变  

Structures and discharge capacities of Mg-Zr-Ni alloy synthesized by high-energy ball milling

作　　者：席生岐[1] 李鹏亮[1] 周敬恩[1] 朱蕊花[1] 王宁[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《材料科学与工艺》2008年第2期239-242,共4页Materials Science and Technology

基　　金：西安市工业科技攻关项目(GG04057);高等学校博士学科点专项科研基金项目(20050698018);新世纪优秀人才计划项目(NCET-05-0839)

摘　　要：为了改善Mg-Ni合金的电化学性能,采用高能球磨技术合成了Mg-Zr-Ni储氢合金,通过改变球磨条件和添加合金元素Zr,利用XRD物相分析和电化学测量技术,研究了Mg-Ni合金的组织演变过程及其对电化学容量的影响.结果表明,高能球磨Mg-Ni和Mg-Zr-Ni合金都经历了非晶态向纳米晶态的转变过程,用少量Zr替代部分Mg后,促进了高能球磨Mg-Zr-Ni合金的非晶化和纳米晶化的过程.与非晶态Mg(Zr)Ni相比,纳米晶的Mg(Zr)Ni中氢更易放出,放电曲线主要呈现高电位放电特征,添加Zr后合金的放电容量有所下降.To improve alloys with different Zr the discharge capacities of Mg. Ni based alloys, the Mg - Ni alloys and Mg - Zr - Ni contents were prepared by high-energy ball milling. Their structures were determined with X-ray diffraction and their discharge capacities were tested. The results showed that both of the structures of Mg - Ni alloy and Mg - Zr - Ni alloy were transformed from amorphous to nanocrystalline respectively during high-energy ball milling for Mg in Mg-Ni alloys The formation of amorphous and nanocrystalline state was promoted by substituting Zr during ball milling. As the hydrogen atom in nanocrystalline Mg-Zr-Ni could be released more easily than that in amorphous Mg-Zr-Mg-Zr- Ni showed a plateau at high voltage Ni, the discharge curve of the nanocrystalline Mg-Zr- Ni showed a plateau at high voltage.

关 键 词：MgZrNi合金 储氢合金 高能球磨 镍氢电池 

分 类 号：TG146.4[一般工业技术—材料科学与工程]