Mg_(2)Ni_(0.9)Co_(0.1)合金微观组织与储氢性能研究  

Microstructure and Hydrogen Storage Properties of Mg_(2)Ni_(0.9)Co_(0.1) Alloy

作　　者：朱黎明 丁鑫 黄锋[1] 陈瑞润[2] Zhu Liming;Ding Xin;Huang Feng;Chen Ruirun(School of Automotive Engineering,Wuhan University of Technology;School of Materials Science and Engineering,Harbin Institute of Technology)

机构地区：[1]武汉理工大学汽车工程学院,武汉430000 [2]哈尔滨工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2021年第9期1128-1132,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金青年基金资助项目(51501136)。

摘　　要：采用冶金法制备了Mg_(2)Ni_(0.9)Co_(0.1)储氢合金,通过XRD和SEM/EDS研究了合金的相组成和显微组织,利用PCT和DSC研究了合金的吸放氢性能。结果表明,铸态合金由包晶Mg_(2)Ni相、Mg-Mg_(2)Ni共晶组织和少量的先析出Mg-Ni-Co三元相组成,元素Co能够固溶在Mg_(2)Ni相中形成Mg_(2)(Ni,Co)固溶体相。合金吸氢后转化为Mg_(2)NiH_(4)相、Mg_(2)Ni_(0.9)Co_(0.1)H4相和MgH_(2)相。Co部分替代Mg_(2)Ni中的Ni,显著提高了合金的等温吸放氢动力学性能,Mg_(2)Ni_(0.9)Co_(0.1)氢化物的放氢温度明显降低,起始放氢温度约为200℃。The Mg_(2)Ni_(0.9)Co_(0.1)hydrogen storage alloy was prepared by metallurgical method,and the phase composition and microstructure of the alloy were invesiagted by XRD and SEM/EDS,meanwhile the hydrogen absorption and desorption properties of the alloy were anlyzed by PCT and DSC.The results reveal that the as-cast alloy is composed of peritectic Mg_(2)Ni phase,Mg-Mg_(2)Ni eutectic structure and a small amount of the first precipitated Mg-Ni-Co ternary phase.The element Co can be dissolved in the Mg_(2)Ni phase to form a Mg_(2)(Ni,Co)solid solution phase.The alloy is transformed into Mg_(2)NiH_(4)phase,Mg_(2)Ni_(0.9)Co_(0.1)H4 phase and MgH_(2)phase after hydrogen absorption.The partial substitution of Co for Ni in the Mg_(2)Ni significantly improves the isothermal de-/hydrogenationkinetic properties of the alloy,and the hydrogen release temperature of Mg_(2)Ni_(0.9)Co_(0.1)hydride is significantly reduced.The initial hydrogen release temperature is about 200℃.

关 键 词：镁基储氢合金 微观组织 储氢性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG115.21[金属学及工艺—金属材料]