Microstructure and Properties of Large-Sized 2219 Aluminum Alloy Billet with Internal Electromagnetic Stirring

被引：0
|
作者：
Qiu Y. [1 ]
Zhang Z. [1 ]
Gao M. [1 ]
Li B. [1 ]
Chen C. [1 ]
机构：
[1] National Engineering & Technology Research Center for Nonferrous Metal Matrix Composite, General Research Institute for Nonferrous Metals, Beijing
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2019年 / 43卷 / 02期
关键词：
2219 aluminum alloy; Fracture morphology; Internal electromagnetic stirring; Mechanical properties; Microstructure and second phase;
D O I：
10.13373/j.cnki.cjrm.XY17050052
中图分类号：
学科分类号：
摘要：
Severe problems such as coarse grain, inhomogeneous microstructure and correspondingly lower strength usually exist in the large-sized aluminum alloy billet prepared by normal direct chill casting. According to those problems, a new melt treatment technique named internal electromagnetic stirring (I-EMS) was put forward, which was based on the normal electromagnetic stirring and annular electromagnetic stirring. The internal electromagnetic stirring was utilized for 2219 aluminum alloy direct chill casting experiment to explore its effects on microstructure and mechanical properties of billet by comparing with the normal direct chill casting, in order to provide references and suggestions for the larger-sized billet. The results showed that after melt treatment by internal electromagnetic stirring, the grains were finer and the microstructures were more uniform, of which the grain diameter were in the range of 127~151 μm. Moreover, the size and number of second phase decreased as well as it distributed homogeneously. Accordingly, its average tensile strength and yield strength increased by 11% and 10%, reaching to 389 and 286 MPa, respectively. The average Brignell hardness also increased by 17%, improving from HB 117.8 to HB 137.8. Furthermore, its properties fluctuated little with the position change while its porosities decreased significantly. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：122 / 127
页数：5
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