Zn和Cu对纯镁的微观组织与导电性能的影响研究  

The effects of Zn and Cu on the microstructure and electrical conductivity of pure magnesium

作　　者：陈汝明 廖启宇 胡文鑫[4] 王一凡 乐启炽 CHEN Ruming;LIAO Qiyu;HU Wenxin;WANG Yifan;LE Qichi(KeyLaborator of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,Liaoning,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;Key Laboratory of Lightweight Structural Materials,Liaoning Province,Northeastern University,Shenyang110819,Liaoning,China;Baotou Research Institute of Rare Earths,Baotou 014000,Neimenggu,China)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819 [2]东北大学材料科学与工程学院,辽宁沈阳110819 [3]东北大学辽宁省轻量化用关键金属结构材料重点实验室,辽宁沈阳110819 [4]包头稀土研究院,内蒙古包头014000

出　　处：《四川冶金》2024年第3期67-74,共8页Sichuan Metallurgy

基　　金：国家自然科学基金(No.52304391,No.51974082);内蒙古自治区自然科学基金(2022MS05045)。

摘　　要：本文研究了Zn和Cu元素的添加对纯Mg微观组织和导电性能的影响。结果表明,Zn和Cu能明显细化纯Mg的铸态组织,且元素添加量越多,晶粒尺寸越细小。铸态Mg-Zn和Mg-Cu合金的导电率均随着元素添加量的增加而不断降低。Mg-Zn合金中,固溶在基体中的溶质原子是影响导电率的主要因素;Mg-Cu合金中,第二相是影响导电率的主要因素。当元素添加量相同时,Zn对导电率的降低作用比Cu要更加显著。分别选取Mg-2.5%Zn合金和Mg-4%Cu合金在不同挤压温度下(200℃、300℃、400℃)进行挤压变形。Mg-2.5%Zn合金随着挤压温度提高,晶粒尺寸增大,第二相数量减少,导电率先降低再升高,但均低于其铸态合金的导电率。Mg-4%Cu合金随着挤压温度提高,晶粒尺寸增大,第二相数量无明显变化,导电率不断升高,均高于其铸态合金的导电率。In this paper,the effects of the addition of Zn and Cu on the microstructure and conductivity of pure Mg were studied.The results show that Zn and Cu can significantly refine the as-cast structure of pure Mg,and the more elements are added,the finer the grain size.The conductivity of as-cast Mg-Zn and Mg-Cu alloys decreases with the increase of element addition.In Mg-Zn alloys,solute atoms dissolved in the matrix are the main factors affecting the conductivity.In Mg-Cu alloys,the second phase is the main factor affecting the conductivity.When the amount of elements added is the same,the reduction of conductivity of Zn is more significant than that of Cu.Mg-2.5%Zn alloy and Mg-4%Cu alloy were selected for extrusion deformation at different extrusion temperatures(200°C,300°C,400°C),respectively.With the increase of extrusion temperature,the grain size of Mg-2.5%Zn alloy increases,the number of second phases decreases,and the conductivity first decreases and then increases,but it is lower than the conductivity of the as-cast alloy.With the increase of extrusion temperature,the grain size of Mg-4%Cu alloy increased,the number of second phases did not change significantly,and the conductivity continued to increase,which was higher than that of the as-cast alloy.

关 键 词：二元镁合金 显微组织 挤压变形 导电率 固溶原子 

分 类 号：TF8[冶金工程—有色金属冶金]