Zr对Mg-Gd-Er合金晶粒细化机理的影响

doi:10.11900/0412.1961.2017.00400

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 WANG^2,³, 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

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[J]. Acta Metall Sin, 2018, 54(6): 911-917.

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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 words： Mg-Gd-Er-Zr alloy wetting angle nucleation activation energy interfacial energy grain refinement mechanism

收稿日期: 2017-09-22

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

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

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

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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