Casting and characterization of Cu-Al-bilayer composites

金属复合材料具有重要的技术意义。它们允许将不同材料的特定积极特性联合收割机组合到一个组件中。近年来，人们为了将铜的优良电性能和热性能与铝的低密度、低价格和良好的电性能结合起来，对复合铸造法制备铜-铝复合材料进行了研究，但对工艺条件、铸造过程与复合材料性能之间的基本关系还没有进行充分的研究。因此，很难评估或预测铸造Cu-Al复合材料进一步金属成形加工的适用性。特别感兴趣的是复合区域内的热条件对边界层的形成和工艺性能的影响。此外，没有数值模型来模拟复合区的微观结构，因此，有必要了解和理解边界层形成的物理机制与铸造条件的关系。为此目的，基本的双层复合材料铸造实验将被应用，以确保在不同的铸造条件下可重复生产的Cu-Al复合材料。此外，还将开发和验证一个模拟模型，以根据铸造条件预测最终的显微组织。总之，必须加强对铸造Cu-Al复合材料的显微组织、物理和工艺性能与进一步金属成形加工的适用性之间的相关性的理解。

Metallic composite materials are of great technical importance. They allow to combine specific positive properties of different materials into one component. In recent years research on the production of copper-aluminum-composites via composite casting has been done with the purpose of combining the excellent electrical and thermal properties of copper with the low density, price and the also good electrical properties of aluminum.Up to now the basic correlations between processing conditions, metallurgic processes and resultant properties of the composites have not been investigated sufficiently. Therefore it is difficult to evaluate or predict the suitability of cast Cu-Al-composites for further metal forming processing. Of particular interest are the effects of the thermic conditions inside the composite zone on the formation of the boundary layer and the technological properties. Furthermore no numerical models exist to simulate the resulting microstructure in the composite zone.Therefore basic knowledge and comprehension of the physical mechanisms of the formation of the boundary layer in dependence on the casting conditions are necessary. For this purpose basic bilayer-composite-casting experiments will be applied to ensure a repeatable production of Cu-Al-composites under varying casting conditions. In addition a simulation model to predict the resulting microstructure in dependence on the casting conditions will be developed and validated. All in one the comprehension of the correlations between the microstructure, the physical and technological properties and the suitability for further metal forming processing of cast Cu-Al-composites has to be enhanced.