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金属学报  2018, Vol. 54 Issue (6): 911-917    DOI: 10.11900/0412.1961.2017.00400
  本期目录 | 过刊浏览 |
Zr对Mg-Gd-Er合金晶粒细化机理的影响
李淑波1, 杜文博1(), 王旭东2,3, 刘轲1, 王朝辉1
1 北京工业大学材料科学与工程学院 北京 100124
2 北京石墨烯技术研究院 北京 100095
3 北京航空材料研究院 北京 100095
Effect of Zr Addition on the Grain Refinement Mechanism of Mg-Gd-Er Alloys
Shubo LI1, Wenbo DU1(), Xudong WANG2,3, Ke LIU1, Zhaohui WANG1
1 College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
2 Beijing Institute of Graphene Technology, Beijing 100095, China
3 AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China
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摘要: 

利用OM、EBSD对比分析了Zr的加入对Mg-Gd-Er合金凝固组织的影响,采用DSC测试了Mg-11Gd-2Er和Mg-11Gd-2Er-0.4Zr 2种合金熔体的过冷度,计算了Zr的加入对合金熔体润湿角及形核激活能的影响,利用HRTEM分析了Zr与Mg的界面关系及Zr的加入对界面能的影响。结果表明,Zr的加入能明显细化Mg-Gd-Er合金的晶粒尺寸,晶粒尺寸由大概率的1000 μm降到了50 μm,细化效果明显;Zr的加入使合金熔体的润湿角由18.3°降到了11.1°,熔体的形核激活能降低了44.4%;Mg的(1010)面与Zr的(1100)面完全共格,降低了Mg和Zr之间的界面能。熔体润湿角的降低和Mg与Zr的完全共格界面关系是细化Mg-Gd-Er合金晶粒尺寸的有效机制。

关键词 Mg-Gd-Er-Zr合金润湿角形核激活能界面能晶粒细化机制    
Abstract

In recent years, Zr is widely used as an important additive element in magnesium alloys containing rare earth (RE), to improve the mechanical properties of Mg-RE alloys such as strength, ductility, creep resistance and corrosion resistance property. Heterogeneous nucleation mechanism and peritectic reaction mechanism are recognized as the main grain refining mechanisms. Whereas, during the solidification process, the melt wetting angle and nucleation energy are important factors which influence the nucleation. In this work, the effect of Zr on the solidification microstructure of the Mg-Gd-Er alloy was analyzed by using OM and EBSD; the undercooling of alloy melts was tested by using DSC; and the Mg/Zr interface relationship and interfacial energy were investigated by using HRTEM. Moreover, the effects of Zr on the wetting angle and nucleation activation energy of the Mg-11Gd-2Er and Mg-11Gd-2Er-0.4Zr alloys were investigated; the refinement mechanism of Zr on the alloys was discussed. The results indicates that the addition of Zr element can significantly refine the grain, and the grain size decreased from 1000 μm to 50 μm. Compared with the Zr-free alloy, the nucleation wetting angle of the present alloy melt decreased from 18.3° to 11.1°, and the activation energy of nucleation decreased by 44.4%. The (1010) plane of Mg was completely coherent with the (1100) plane of Zr, reducing the interfacial energy between the (1010)Mg and the (1100)Zr. The grain refinement of Mg-Gd-Er alloy was ascribed to the decrease of melt wetting angle and the fully coherent interface relationship between Mg and Zr.

Key wordsMg-Gd-Er-Zr alloy    wetting angle    nucleation activation energy    interfacial energy    grain refinement mechanism
收稿日期: 2017-09-22      出版日期: 2018-01-16
ZTFLH:  TG146  
基金资助:国家重点研发计划项目No.2016YFB0301001及北京市自然科学基金项目Nos.2172013和2162003
作者简介:

作者简介 李淑波,女,1975年生,博士

引用本文:

李淑波, 杜文博, 王旭东, 刘轲, 王朝辉. Zr对Mg-Gd-Er合金晶粒细化机理的影响[J]. 金属学报, 2018, 54(6): 911-917.
Shubo LI, Wenbo DU, Xudong WANG, Ke LIU, Zhaohui WANG. Effect of Zr Addition on the Grain Refinement Mechanism of Mg-Gd-Er Alloys. Acta Metall, 2018, 54(6): 911-917.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2017.00400      或      http://www.ams.org.cn/CN/Y2018/V54/I6/911

Alloy Mg Gd Er Zr
Mg-11Gd-2Er 87.65 10.62 1.73 -
Mg-11Gd-2Er-0.4Zr 87.39 10.54 1.69 0.38
表1  实验合金化学成分
图1  Zr的加入对合金晶粒尺寸的影响
图2  Zr元素对Mg-11Gd-2Er合金晶粒尺寸影响的EBSD分析及晶粒尺寸分布图
图3  Mg-11Gd-2Er-0.4Zr合金的SEM像及其EDS Zr元素分布图
图4  Zr核的TEM像及EDS
图5  Mg-11Gd-2Er和Mg-11Gd-2Er-0.4Zr合金的DSC曲线
Alloy TL TN ΔT
Mg-11Gd-2Er 904.3 889.2 15.1
Mg-11Gd-2Er-0.4Zr 905.7 894.4 11.3
表2  镁合金熔体固液转变的特征温度
图6  Mg-11Gd-2Er-0.4Zr合金中Zr核与Mg基体界面HRTEM像
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