C18150铜/1060铝层状复合材料铸轧工艺优化及组织性能研究

目的 通过有限元模拟方法探究铸轧过程中铜铝层状复合材料温度场和液相率的演变规律，确定铸轧过程中的最优走坯速度和浇铸温度，并制备一种具有高强高导的铜/铝/铜层状复合材料。方法 基于Ansys Workbench软件中的Design modeler模块建立二维模型，使用JMatPro软件模拟C18150铜和1060铝的热物性参数，通过Mesh模块进行网格划分并利用Fluent模块对模型进行求解。通过调整和优化走坯速度和浇铸温度等参数，研究其对液相率和温度场的影响。制备了高强高导铜/铝/铜层状复合材料，并通过场发射扫描电镜、电子万能试验机、手持式导电率测试仪和扫描电镜等手段对铜/铝/铜层状复合材料界面的微观组织、抗拉强度、导电率以及拉伸断口进行表征和分析。结果 当走坯速度和浇铸温度分别为1.2 mm/min和963 K时，铸轧效果最佳，制备的复合材料界面平整且结合良好，界面处存在Al2Cu和Al4Cu9双界面层。拉伸强度和延伸率分别为201 MPa和16%，铜侧导电率为87%IACS，铜铝断口处均出现了大量韧窝，表明为韧性断裂。结论 通过优化铸轧工艺参数制备的铜/铝/铜层状复合材料具有优异的强度和导电率。

Cast-rolling Process Optimization, Microstructure and Properties of C18150 Copper/1060 Aluminum Layered Composites

The work aims to investigate the evolution of temperature field and liquid phase rate during the cast-rolling process of copper aluminum layered composites by finite element simulation, determine the optimal billet speed and casting temperature during the cast-rolling process, and prepare copper/aluminum/copper composites with high-strength and high-conductivity. Based on the Design modeler module in Ansys Workbench software, a two-dimensional model was established. JMatPro software was used to simulate the thermal physical parameters of C18150 copper and 1060 aluminum. The model was solved by meshing with Mesh module and solving with Fluent module. Its effects on the liquid phase rate and temperature field were investigated by adjusting and optimizing the parameters of walking speed and casting temperature. High-strength and high-conductivity copper/aluminum/copper layered composites were prepared with this cast-rolling process. The microstructures, tensile strength, conductivity and tensile fracture of the copper/aluminum/copper layered composites interfaces were characterized and analyzed by a field emission scanning electron microscopy (FESM), an electronic universal testing machine (EUTM), a hand-held conductivity tester (HECT), and a scanning electron microscopy (SEM). The best cast-rolling results were obtained when the walking speed and casting temperature were about 1.2 mm/min and 963 K, respectively, and the prepared composites had flat and well-bonded interfaces, with Al2Cu and Al4Cu9 double interfacial layers at the interfaces. The tensile strength and elongation were 201 MPa and 16%, respectively, and the average electrical conductivity on the copper side was 87% IACS, and a large number of tough nests appeared at the copper-aluminum fracture, which indicated that it was a toughness fracture. It is concluded that the copper/aluminum/copper layered composites prepared by optimizing the parameters of the casting and rolling process have excellent strength and electrical conductivity.