Microstructure and Mechanical Properties of Al/Mg/Al Laminated Composite Plates

JIA Jiyu; XU Jing; FENG Xiaowei; FENG Bo; LI Jian; XIANG Qingchun; ZHENG Kaihong; PAN Fusheng

doi:10.3969/j.issn.1674-6457.2025.08.009

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (8) : 77-84. DOI: 10.3969/j.issn.1674-6457.2025.08.009

Light Alloy Forming

Microstructure and Mechanical Properties of Al/Mg/Al Laminated Composite Plates

JIA Jiyu^1,2, XU Jing^2,*, FENG Xiaowei², FENG Bo², LI Jian², XIANG Qingchun^1,*, ZHENG Kaihong², PAN Fusheng^2,3

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Abstract

The work aims to study the effect of rolling reduction on the microstructure evolution and properties of Al/Mg/Al laminated composite plates, and clarify the relationship between the interface, microstructure and mechanical properties of composite plates under different rolling reduction. The Al/Mg/Al laminated composite plate was rolled one pass at 400 ℃, and the rolling reduction was 40%, 50 % and 60%. The interface and microstructure were observed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The mechanical properties of the composite plate were tested and characterized by universal testing machine. The results showed that the interface of the Al/Mg/Al laminated composite plate was well bonded, and no holes and intermetallic compounds were formed. With the increase of reduction, the grain structure of the Mg layer was more uniform and fine, the grain size was 4.34 μm, the grain of the Al side was more slender, and the proportion of recrystallized grains of the Mg layer and the Al layer increased. With the increase of reduction, the tensile strength and yield strength of the Al/Mg/Al laminated composite plate gradually increased, and the elongation was opposite. The maximum tensile strength, yield strength and elongation of the composite plate with 60% reduction were 336 MPa, 266 MPa and 6.16%, respectively. With the increase of reduction, the bending strength of the composite plate decreased gradually. The interface of the composite plate with 50% and 60% reduction was not layered under the maximum bending strength, and the interface was well bonded. With the increase of reduction, the fracture mode of the composite plate changed from ductile fracture to ductile + cleavage mixed fracture. There is no intermetallic compound formed in the Al/Mg/Al laminated composite plate after one pass rolling, and the interface bonding is good. Compared with the composite plate of 40% reduction , the tensile strength and yield strength of the composite plate with 60% reduction are increased by 20.8% and 18.7%, respectively.

Key words

one pass hot rolling / Al/Mg/Al laminated composite plate / microstructure / mechanical properties

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JIA Jiyu, XU Jing, FENG Xiaowei, FENG Bo, LI Jian, XIANG Qingchun, ZHENG Kaihong, PAN Fusheng. Microstructure and Mechanical Properties of Al/Mg/Al Laminated Composite Plates[J]. Journal of Netshape Forming Engineering. 2025, 17(8): 77-84 https://doi.org/10.3969/j.issn.1674-6457.2025.08.009

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Funding

Guangdong Major Project of Basic and Applied Basic Research (2020B0301030006); GDAS' Project of Science and Technology Development (2020GDASYL-20200101001, 2023GDASONRC-0210, 2023GDASONRC0321); Guangdong Science Funded Project of Guangdong Special Support Program(2023TX07C512); Technology Plan Project (2023A0505030002)