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Preparation, interfacial regulation and strengthening of mg/al bimetal fabricated by compound casting: A review

Journal of Magnesium and alloys 2023年第9期11卷 3059-3098页

作者： Guangyu Li Wenming Jiang Feng Guan Zheng Zhang Junlong Wang Yang Yu Zitian Fan State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

mg/al bimetal combines the advantages of both aluminum and magnesium and has broad application prospects in automotive, aerospace,weapons, digital products and so on. The compound casting has the characteristics of low cost, easy to achieve metallurgical combination and suitable for the preparation of complex bimetallic parts. However, bimetallic joint strength is low due to differences of physical properties between al and mg, oxide film on metallic surface and interfacial al-mg IMCs, which is closely related to the interfacial microstructure and properties. Therefore, how to control the interface of the bimetal to achieve performance enhancement is the focus and difficulty in this field. At present, there are mainly the following strengthening methods. First, the “zincate galvanizing” and “electrolytic polishing+anodic oxidation” technology were exert on the surface of al alloy to remove and break the oxide film, which improved the wettability between al and mg. Second, the undesirable al-mg IMCs were reduce or elimination by adding the interlayers(Zn, Ni and Ni-Cu). Thirdly, the evolution process of interfacial microstructure was changed and fine strengthening phases were formed by adding Si element to al alloy or rare earth element to mg alloy. Fourthly, mechanical vibration and ultrasonic vibration were applied in the process of the filling and solidification to refine and homogenize the interfacial structure. Finally, some other methods, including secondary rolling, thermal modification, heat treatment and constructing exterior 3D morphology, also can be used to regulate the interfacial microstructure and compositions. The above strengthening methods can be used alone or in combination to achieve bimetallic strengthening. Finally, the future development direction of the mg/al bimetal is prospected, which provides some new ideas for the development and application of the mg/al bimetal.

关键词： mg/al bimetal Preparation Compound casting Interfacial regulation Interface strengthening Research progress

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Effect of vibration on interfacial microstructure and mechanical properties of mg/al bimetal prepared by a novel compound casting

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Journal of Magnesium and alloys 2022年第8期10卷 2296-2309页

作者： Feng Guan Wenming Jiang Guangyu Li Junwen Zhu Junlong Wang Guoliang Jie Zitian Fan State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

In this work,a vibration was applied in the preparation of the mg/al bimetal by a novel compound casting in order to improve the mechanical properties of the mg/al bimetal,and the effect of the vibration on the interfacial microstructure and mechanical properties of the mg/al bimetal was *** results indicated that the vibration had a significant effect on the interfacial microstructure and mechanical properties of the mg/al bimetal,but it did not change the phase compositions of the interface,which was composed of layerⅠ(al3mg2+mg2Si),layerⅡ(al_(12)mg_(17)+mg_(2)Si)and layerⅢ(al_(12)mg_(17)/δ-mg).Without vibration,the mg_(2)Si phase with a needle-like morphology mainly aggregated in the layerⅡof the *** the application of the vibration,the SEM and EBSD analysis results showed that the mg_(2)Si and al3mg2phases in the interface were obviously refined,and the distribution of the mg_(2)Si became more uniform,due to the strong forced convection of the molten metal resulting from the *** TEM analysis indicated that the interface between the A_(l3)mg_(2) and mg_(2)Si phases was non-coherent,suggesting the mg_(2)Si particles cannot act as a heterogeneous nucleation base during the solidification process of the *** to the mg/al bimetal without vibration,the shear strength of the mg/al bimetal with vibration increased by about 50%from 31.7 MPa on average to 47.5 MPa,and the hardness of the layer I of the interface increased,and the hardness of the layerⅢ*** fracture surface transformed from a flat fracture morphology without vibration to an irregular zigzag fracture morphology.

关键词： mg/al bimetal Vibration Compound casting Interfacial microstructure Bonding properties

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Effect of melt-to-solid volume ratio and preheating temperature on mg/al bimetals interface by centrifugal casting

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China Foundry 2023年第3期20卷 234-240页

作者： Morteza Sarvari Mehdi Divandari Hassan Saghafan Sina Ghaemi Khiavi School of Metallurgy and Materials Engineering Iran University of Science and TechnologyNarmakTehran 16844Iran

Compound casting is an efficient method for bonding dissimilar metals,in which a dramatic reaction can occur between the melt and *** centrifugal casting process,a type of compound casting,was applied to cast al/mg dissimilar *** melt was poured at 700 °C,with melt-to-solid volume ratios(Vm/Vs) of 1.5 and 3,into a preheated hollow aluminum *** preheating temperatures of the solid part were 320,400,and 450 °C,and the constant rotational speed was 1,600 *** cast parts were kept inside the casting machine until reaching the cooling temperature of 150 °*** result showed that an increase in preheating temperature from 320 to 450 °C led to an enhanced reaction layer *** addition,an increase in the Vm/Vs from 1.5 to 3 resulted in raising the interface thickness from 1.2 to 1.8 ***,the interface was not continuously formed when a Vm/Vs of 3 was *** this case,the force of contraction overcame the resultant acting force on the *** interface formed at the volume ratio of 1.5 was examined using scanning electron microscopy(SEM) equipped with energy-dispersive X-ray spectroscopy(EDS),and the results demonstrated the formation of al_(3)mg_(2),al_(12)mg_(17) and(δ+al_(12)mg_(17)) eutectic structures in the interface.

关键词： compound casting centrifugal casting mg/al bimetal preheating temperature melt-to-solid volume ratio interface

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