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
陈汝明 1廖启宇 2胡文鑫 3王一凡 1乐启炽1
作者信息
- 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;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
- 3. 包头稀土研究院,内蒙古 包头,014000
- 折叠
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.
Abstract
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℃,300℃,400℃),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 conduc-tivity 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Key words
binary magnesium alloys/microstructure/extrusion deformation/electrical conductivity/solid solution atoms引用本文复制引用
基金项目
国家自然科学基金(52304391)
国家自然科学基金(51974082)
内蒙古自治区自然科学基金(2022MS05045)
出版年
2024
NETL
NSTL
万方数据