淬速对稀土镁基合金微观组织及电化学性能的影响研究  

Effects of Quenching Rate on Microstructure and Electrochemical Performance of Rare Earth Mg-based Alloy

作　　者：董小平[1] 刘生龙[2] 陈家熠 杨丽颖[1] 王翠表[1] 张羊换[2] 

机构地区：[1]河北大学质量技术监督学院,河北保定071002 [2]内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《稀有金属与硬质合金》2014年第2期54-58,63,共6页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金项目(51371094);河北省高等学校科学研究计划项目(Z2012168);保定市科学技术研究与发展计划项目(12ZG018)

摘　　要：用熔体快淬技术制备了La0.75Mg0.25Ni3.5Co0.2合金。采用扫描电镜与X射线衍射仪分析了合金的显微组织结构,并采用电化学法测试了合金电极的电化学性能。结果表明,快淬态合金为多相结构,合金的XRD谱中主衍射峰半高宽和微观应变增大,晶粒明显细化,柱状晶微区较大。随着淬速的提高,合金的放电容量降低,放电平台中值电位以及开路电位正移,合金的循环稳定性提高。Mg0.25Ni3.5Co0.2 alloy was prepared by melt rapid quenching technology. The microstructure of the alloy was analyzed by SEM and XRD, and its electrochemical performance was tested with electrochemical method. The results show that the quenched alloy has multiphase structure,increased main diffraction peak FWHM and micro-strain, obviously refined grains and larger area of columnar crystal zone. With the increase of quenching rate, discharge capacity of the alloy decreases, medium potential of discharge plateau and open-circuit potential positively shift, and cycling stability is enhanced.

关 键 词：稀土镁基合金 熔体快淬技术 电极 淬速 电化学性能 微观组织 

分 类 号：TG146.45[一般工业技术—材料科学与工程]