1. Key laboratory of interface science and engineering in advanced materials, Ministry of Education, Taiyuan University of Technology; Taiyuan 030024, China; 2. Shanxi research center of advanced materials science and technology, Taiyuan University of Technology; Taiyuan 030024, China; 3. College of material science and technology, Taiyuan university of technology, Taiyuan 030024, China
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DOI:
10.7502/j.issn.1674-3962.2015.05.07
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Abstract:
The current studies on magnesium alloy focused on the preparation of magnesium alloy and its composite materials, and the preparation of light metal nano-multilayer composites was rarely studied. In this paper, magnesium carbon multilayer of materials was prepared by applying seven cycles of accumulative roll bonding under certain temperature to magnesium sheets coated with ball-milled Mg/CNTS powders.The evolution of the microstructure on the process of accumulative roll-bonding is respectively characterized by scanning electron microscope and optical microscopy. The results show that the interface bonding of the magnesium carbon multilayer of materials is mechanical bonding under the process used in this paper. The theoretical thickness of magnesia carbon multi-layer is about 685 nm, and the actual thickness is about 4 μm due to partial magnesium alloy layer integration. In addition, in the role of repeated dynamic recrystallization and layer interface on grain growth of obstacles, the material in a thin layer of magnesium alloy has a fine grain.