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Effect of Al on Expansion Behavior of Mg–Al Alloys During Solidification

Acta Metallurgica Sinica(English Letters) 2019年第5期32卷 559-565页

作者： Yi Meng jian Sun Lei-Gang Cao Yue Yang Hai-Tao Zhang jian-zhong cui School of Mechanical and Materials Engineering North China University of Technology Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University

The cooling curves and the change of contraction/expansion during solidification and cooling were tested by using a selfmade device which could achieve the one-dimensional contraction instead of three-dimensional contraction of the ***, the effects of Al content(0, 1.1, 3, 5, 10, 12.9, 15, 17, 19, 22, 24 and 30 wt%) on the thermal contraction/expansion of the binary Mg-Al as-cast alloys during solidification were obtained. The results showed that expanding instead of contraction was present in Mg-Al alloys with the addition of 0-30 wt% Al during solidification. The values of expansion significantly increased at first and then decreased with the increase in Al content. And the maximum expansion ratio of 0.44%(maximum expansion value: 0.841 mm) was present in the Mg-15 wt% Al alloy. Contraction instead of expansion occurred once the temperature drops to the temperature corresponding to the expansion value in total, indicating the occurrence of a continuous expansion during the solidification process in mushy zone for the Mg alloys with Al addition of 5-30 wt%. The expansion value in total consisted of two parts: the expansions occurring in the liquid-phase zone and mushy zone. The expansion in liquid zone was present in every Mg-Al alloy, and it contributed to the most proportion of the total expansion value when the Al content in Mg-Al alloy was lower than 10 wt% or higher than 22 wt%. However, the total expansion value was mainly determined by the solidification behavior in mushy zone when the Al content was among 10-22 wt% in Mg-Al alloys.

关键词： Solidification Mg alloys Al content Expansion

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Effects of Ag addition on the microstructures and properties of Al–Mg–Si–Cu alloys

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 62-72页

作者： Li-zi He Yi-heng Cao Yi-zhou Zhou jian-zhong cui Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern University School of Materials Science and Engineering Northeastern University Institute of Metal Research Chinese Academy of Sciences

Effects of Ag addition on the microsmactures, aging characteristics, tensile properties, electrochemical properties, and intergranu- lar corrosion （IGC） properties of Al 1.1Mg-0.8Si-0.9Cu-0.35Mn4）.02Ti alloy were investigated using scanning electronic microscopy and transmission electronic microscopy. The aging process of Al-Mg-Si-Cu alloys was accelerated by the addition of Ag. The strength of peak-aged Al-Mg-Si-Cu alloys was enhanced by Ag addition because of the high density of β＂- and L-phase age-hardening precipitates. The corrosion performance of the Al-Mg-Sii-Cu alloy is closely related to the aging conditions and is independent of the Ag content. The IGC susceptibility is serious in the peak-aged alloy because of the continuous distribution of Cu-rich Q-phase precipitates along grain boun- daries. Ag addition reduces the size of the grain-boundary-precipitate Q phase and the width of the precipitate-free zone and thus results in decreased IGC susceptibility of Al-Mg-Si Cu alloys.

关键词： Al-Mg-Si-Cu alloys silver addition aging tensile properties corrosion properties microstructures

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Low Frequency Electromagnetic Casting of 2195 Aluminum-Lithium Alloy and Its Effects on Microstructure and Mechanical Properties

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Acta Metallurgica Sinica(English Letters) 2020年第3期33卷 338-350页

作者： Fu-Yue Wang Xiang-Jie Wang Wei Sun Fang Yu jian-zhong cui Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

In this study,the low frequency electromagnetic casting(LFEC) technology was adopted to fabricate 2195 Al-Li *** microstructure and solid solubility of as-cast 2195 alloys,as well as the second phase precipitation and tensile properties after aging,were investiagated and compared with the counterpart direct chill casting 2195 *** results indicate that LFEC can significantly improve the microstructure and metallurgical quality of as-cast alloy,and increase the number density of θ’(Al2Cu) and T1(Al2CuLi) phases during aging treatment due to the enhanced solubilities of alloying *** tensile properties of 2195 aged alloy cast by LFEC were hence improved evidently.

关键词： LFEC(low frequency electromagnetic casting) 2195 Aluminum-lithium alloy Casting defects Microstructure Tensile property

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Microstructure and mechanical properties of the welding joint filled with microalloying 5183 aluminum welding wires

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International Journal of Minerals,Metallurgy and Materials 2014年第6期21卷 577-582页

作者： Zhen Xu Zhi-hao Zhao Gao-song Wang Chao Zhang jian-zhong cui The Key Laboratory of the Ministry of Education of China for Electromagnetic Processing of Materials Northeastern University

In this study, 7A52 aluminum alloy sheets of 4 mm in thickness were welded by tungsten inert gas welding using microalloying welding wires containing traces of Zr and Er. The influence of rare earth elements Zr and Er on the microstructure and mechanical properties of the welded joints was analyzed by optical microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, hardness testing, and tensile mechanical properties testing. Systematic analyses indicate that the addition of trace amounts of Er and Zr leads to the formation of fine Al3Er, Al3Zr, and Al3（Zr,Er） phases that favor significant grain refinement in the weld zone. Besides, the tensile strength and hardness of the welded joints were obviously improved with the addition of Er and Zr, as evidenced by the increase in tensile strength and elongation by 40 MPa and 1.4%, respectively, and by the welding coefficient of 73%.

关键词： aluminum alloys inert gas welding rare earth elements microalloying joints microstructure mechanical properties

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Interfacial characteristics and properties of a low-clad-ratio AA4045/AA3003 cladding billet fabricated by semi-continuous casting

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International Journal of Minerals,Metallurgy and Materials 2016年第9期23卷 1097-1103页

作者： Xing Han Hai-tao Zhang Bo Shao Lei Li Ke Qin jian-zhong cui Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University

A low-clad-ratio AA4045/AA3003 cladding billet was fabricated using a semi-continuous casting process and was subsequently extruded indirectly into a cladding pipe. The temperature distribution near the interface was measured. The microstructures, elemental distribution, Vickers hardness around the bonding interface, and the interfacial shear strength were examined. The results showed that the interface temperature rebounded when AA4045 melt contacted the supporting layer. The two alloys bonded well, with few defects, via the diffusion of Si and Mn in the temperature range from 569℃ to 632℃. The mean shear strength of the bonding interface was 82.3 MPa, which was greater than that of AA3003（75.8 MPa）, indicating that the two alloys bonded with each other metallurgically via elemental interdiffusion. Moreover, no relative slip occurred between the two alloys during the extrusion process.

关键词： aluminum alloys metal cladding casting interdiffusion interfaces

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As-cast structure of DC casting 7075 aluminum alloy obtained under dual-frequency electromagnetic field

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International Journal of Minerals,Metallurgy and Materials 2014年第2期21卷 150-154页

作者： Zhi-hao Zhao Zhen Xu Gao-song Wang Qing-feng Zhu jian-zhong cui The Key Laboratory of the Ministry of Education of China for Electromagnetic Processing of Materials Northeastern University

We have experimentally determined the as-cast structures of semi-continuous casting 7075 aluminum alloy obtained in the pres-ence of dual-frequency electromagnetic field. Results suggest that the use of dual-frequency electromagnetic field during the semi-continuous casting process of 7075 aluminum alloy ingots reduces the thickness of the surface segregation layer, increases the height of the melt menis-cus, enhances the surface quality of the ingot, and changes the surface morphology of the melt pool. Moreover, low-frequency electromag-netic field was found to show the most obvious influence on improving the as-cast structure because of its high permeability in conductors.

关键词： electromagnetic fields: semi-continuous casting aluminum alloys as-cast structure

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Microstructures and properties of 6016 aluminum alloy with gradient composition

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Rare Metals 2021年第8期40卷 2154-2159页

作者： Xiang-Jie Wang Wei Sun Jun-Fu Chen Fu-Yue Wang Lei Li jian-zhong cui Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China

Weight reduction plays an important role in reducing fuel and emissions,and the heat-treatable 6016 aluminum alloy exhibits excellent application prospect in automobile *** this paper,ingot with constant Mg/Si ratio and decreased Mg and Si contents was *** the microstructure and the texture of 6016 aluminum alloy plate designed with different alloy compositions at the top/bottom were systematically investigated by electron backscatter diffraction technology(EBSD)measurement,as well as the room-temperature mechanical properties at the different positions with composition *** results indicate that as Mg and Si contents increase,the grain size decreases,improving the cube texture with recrystallization and weakening the S *** strength of 6016 aluminum alloy decreases with lower Mg and Si contents.

关键词： 6016 Aluminum alloy plate Mg and Si contents Mechanical properties

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Microstructural evolution of ECAPed 1050 alloy under magnetic annealing

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International Journal of Minerals,Metallurgy and Materials 2014年第12期21卷 1205-1214页

作者： Yi-heng Cao Pin-feng Jia Kang Wang Li-zi He Ping Wang jian-zhong cui Key Lab of Electromagnetic Processing of Materials Ministry of Education Northeastern University

Hardness and microstructure evolutions in 1050 aluminum alloy prepared by equal-channel angular pressing （ECAP） were inves- tigated by hardness testing, optical microscopy, and transmission electron microscopy after samples were annealed at different temperatures for 1 h both in the absence and presence of a 12-T magnetic field. The results showed that the hardness of samples after magnetic annealing were lower than that of samples after normal annealing at 150-250℃, but it was higher than that of samples after normal annealing at 〉250℃. During annealing, the rate of softening was faster, and the grains were more homogeneous in 8-ECAPed samples than in 2-ECAPed samples. A rapid grain growth occurred when 2-ECAPed samples were annealed at high temperature （〉300℃）. The magnetic field enhanced the mobility of dislocations and grain boundaries. A more homogeneous grain size was observed in samples prepared under an applied magnetic field.

关键词： aluminum alloys magnetic annealing equal channel angular pressing microstructural evolution grain growth

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The evolution of microstructure and mechanical properties during high-speed direct-chill casting in different Al–Mg_2Si in situ composites

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International Journal of Minerals,Metallurgy and Materials 2018年第9期25卷 1080-1089页

作者： Dong-tao Wang Hai-tao Zhang Lei Li Hai-lin Wu Ke Qin jian-zhong cui Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University

The effect of high-speed direct-chill(DC) casting on the microstructure and mechanical properties of Al–Mg_2Si in situ composites and AA6061 alloy was investigated. The microstructural evolution of the Al–Mg_2Si composites and AA6061 alloy was examined by optical microscopy, field-emission scanning electron microscopy(FE-SEM) and transmission electron microscopy(TEM). The results revealed that an increase of the casting speed substantially refined the primary Mg_2Si particles(from 28 to 12 μm), the spacing of eutectic Mg_2Si(from 3 to 0.5 μm), and the grains of AA6061 alloy(from 102 to 22 μm). The morphology of the eutectic Mg_2Si transformed from lamellar to rod-like and fibrous with increasing casting speed. The tensile tests showed that the yield strength, tensile strength, and elongation improved at higher casting speeds because of refinement of the Mg_2Si phase and the grains in the Al–Mg_2Si composites and the AA6061 alloy. High-speed DC casting is demonstrated to be an effective method to improve the mechanical properties of Al–Mg_2Si composites and AA6061 alloy billets.

关键词： Al–Mg2Si in situ composite casting speed grain size primary Mg2Si mechanical property

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Effects of low-frequency electromagnetic field on the surface quality of 7050 aluminum alloy ingots during the hot-top casting process

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International Journal of Minerals,Metallurgy and Materials 2011年第2期18卷 165-168页

作者： Xiang-jie Wang jian-zhong cui Yu-bo Zuo Zhi-hao Zhao Hai-tao Zhang Key Lab of Electromagnetic Processing of Materials （Ministry of Education） Northeastern University Shenyang 110004 China

To improve the quality of 7050 aluminum alloy ingots, low-frequency electromagnetic （LFE） field was applied during the conventional hot-top casting process. Macrostructures and microstructures of the ingots by the conventional and LFE hot-top casting processes were studied. The experimental results show that when the LFE field is turn off during the hot-top casting process, cold folding appears, and the as-cast structure becomes very coarse. Additionally, the thickness of the shell zone is much thinner during the low-frequency electromagnetic hot-top casting process than that during the conventional hot-top casting process. Some reasons for low-frequency electromagnetic field improving the surface quality, refining the structure of the ingot, and minimizing the thickness of the shell zone have been studied.

关键词： aluminum alloys solidification surface quality electromagnetic field

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