Bian Xiaoqian, Wang Aiqin, Xie Jingpei, Liu Pei, Mao Zhiping, Liu Zhenwei
College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, People's Republic of China.
Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, Luoyang 471023, People's Republic of China.
Nanotechnology. 2023 Aug 17;34(44). doi: 10.1088/1361-6528/acec7c.
Nano-polycrystalline Cu/AlCu/Al layered composites with different layer thicknessesof single-crystal AlCu constituent are constructed. The effects ofon the strength and fracture modes of nano-polycrystalline Cu/AlCu/Al layered composites are systematically investigated by molecular dynamics simulations. The uniaxial tensile results show that the ultimate strength and fracture mode of the nano-polycrystalline Cu/AlCu/Al layered composites do not change monotonically with the change of single crystal AlCu constituent layer thickness, the ultimate strength peaking at= 2.44 nm, and the toughness reaching the optimum at= 4.88 nm. The improvement of deformation incompatibility between Cu, Al and AlCu components increases the ultimate strength of polycrystalline Cu/AlCu/Al laminated composites. Due to the high activity of Cu dislocation and the uniformity of strain distribution of single crystal AlCu, the fracture of nano-crystalline Cu/AlCu/Al layered composites changes from brittleness to toughness. This study is crucial to establish the organic connection between microstructure and macroscopic properties of Cu/Al layered composites. To provide theoretical basis and technical support for the application of Cu/Al layered composites in high-end fields, such as automotive and marine, aerospace and defense industries.
构建了具有不同单晶AlCu组成层厚度的纳米多晶Cu/AlCu/Al层状复合材料。通过分子动力学模拟系统地研究了其对纳米多晶Cu/AlCu/Al层状复合材料强度和断裂模式的影响。单轴拉伸结果表明，纳米多晶Cu/AlCu/Al层状复合材料的极限强度和断裂模式并不随单晶AlCu组成层厚度的变化而单调变化，极限强度在 = 2.44 nm时达到峰值，韧性在 = 4.88 nm时达到最优。Cu、Al和AlCu组分之间变形不相容性的改善提高了多晶Cu/AlCu/Al层状复合材料的极限强度。由于Cu位错的高活性和单晶AlCu应变分布的均匀性，纳米晶Cu/AlCu/Al层状复合材料的断裂从脆性转变为韧性。该研究对于建立Cu/Al层状复合材料微观结构与宏观性能之间的有机联系至关重要。为Cu/Al层状复合材料在汽车、船舶、航空航天和国防工业等高端领域的应用提供理论依据和技术支持。
