通过添加微量元素实现的窄结晶区间Al-2Mg-0.5Mn合金的显微组织与性能  

Microstructure and properties of Al−2Mg−0.5Mn alloy with narrow crystallization temperature range realized by adding trace elements

作　　者：李梦佳 张恩贵 刘书玉 王向东 史运嘉 吴建政 关绍康[1] Meng-jia LI;En-gui ZHANG;Shu-yu LIU;Xiang-dong WANG;Yun-jia SHI;Jian-zheng WU;Shao-kang GUAN(School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;Guizhou Aerospace Xinli Technology Co.,Ltd.,Guizhou 563000,China;Manufacturing Center,CRRC Times Electric Co.,Ltd.,Zhuzhou 412001,China;Key Laboratory of Material Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450052,China;Key Laboratory of Precious Metals Analysis and Exploration Technology of Ministry of Natural Resources,Zhengzhou 450012,China)

机构地区：[1]郑州大学材料科学与工程学院,郑州450001 [2]贵州航天新力科技有限公司,贵州563000 [3]株洲中车时代电气股份有限公司制造中心,株洲412001 [4]郑州大学物理(微电子)学院材料物理教育部重点实验室,郑州450052 [5]自然资源部贵金属分析与勘查技术重点实验室,郑州450012

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第10期2898-2912,共15页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51901207)。

摘　　要：Al-Mg系合金由于大的结晶温度区间,其表面会在连铸连轧生产过程中形成较多缺陷。为了减小合金的结晶区间,研究微量Zn、Si、Zr和Ti元素对Al-2Mg-0.5Mn合金显微组织与性能的影响。采用X射线光电子能谱、原子力显微镜、扫描电镜和透射电镜对合金的显微组织进行表征。Ti和Zr的添加可以在Al-Mg-Mn合金内部形成Al_(3)Ti和Al3Zr,使得其晶粒更细、强度更高,但是其结晶区间也随之变大。研究表明,添加Zn和Si能与合金内部的Mg形成新的第二相,从而使得共晶凝固过程中的实际Mg含量降低,因此,Al-2Mg-0.5Mn-0.2Zn-0.2Si合金的结晶温度区间比Al-2Mg-0.5Mn合金的窄。另外,添加Zn和Si后,Al-2Mg-0.5Mn合金的力学性能与抗腐蚀性也得到一定程度的提升。The wide crystallization temperature range of Al−Mg alloys is a key factor for the surface defect formation during continuous casting and rolling process.To reduce the crystallization temperature range of the alloy,the influences of trace Zn,Si,Zr and Ti elements on the microstructure and properties of Al−2Mg−0.5Mn alloy were investigated.The X-ray photoelectron spectroscopy,atomic force microscopy,scanning and transmission electron microscopy were used for microstructural characterization.The Ti and Zr additions could refine the grain size and improve the strength of the Al−Mg−Mn alloy by forming Al_(3)Ti and Al3Zr in the alloy,while the crystallization temperature ranges of these alloys were wider.It was revealed that Zn and Si additions could form new secondary phases with Mg in the alloy,thus reducing the actual Mg content during later eutectic solidification process.Therefore,the crystallization temperature range of Al−2Mg−0.5Mn−0.2Zn−0.2Si alloy was narrower than that of Al−2Mg−0.5Mn alloy.The mechanical properties and corrosion resistance of Al−2Mg−0.5Mn alloy were also improved by the additions of Zn and Si.

关 键 词：铝镁合金 连铸连轧 力学性能 腐蚀行为 结晶温度区间 

分 类 号：TG146.21[一般工业技术—材料科学与工程]