Production of aluminum-steel-compounds by means of twin-roll casting

复合材料用于许多现代应用，如轻型车辆结构。不同材料的组合可以实现其他无法实现的性能。特别感兴趣的是片状材料化合物，其中铝-钢混合代表了一种常见的材料组合。在上述材料之间建立高质量的材料连接是困难的，因为形成了一层快速增长的大部分脆性金属间相。如果该金属间层的厚度超过10微米，则扩散区在机械载荷下的稳定性和连接强度将大大降低。因此，复合材料的适应性取决于扩散过程控制的目标，以确保高结合强度。从生态和经济的角度来看，双辊连铸工艺是最现代的钣金制造方法之一。在这种方法中，厚度在1到8毫米之间的薄条直接从熔体中铸造出来。然而，这种方法目前只用于不同铝合金之间的复合材料的实验生产。提出的项目的目的是对扩散过程进行基础研究，以确定在双辊带材铸造工艺的特定条件下铝-钢化合物的适当显微组织和力学性能。

Compound materials are used for many modern applications such as lightweight vehicle construction. The combination of different materials enables the achievement of elsewise unattainable properties. Of particular interest are sheet-form material compounds at which aluminum-steel hybrids represent a common material combination. The creation of a high-quality material connection between the above-mentioned materials is difficult due to the formation of a rapidly growing layer of mostly brittle intermetallic phases. If this intermetallic layer exceeds a thickness of 10 microns the stability of the diffusion zone under mechanical load and the connection strength are considerably reduced. Hence, the adaption of compound materials is subject to the objectives of a diffusion process control to ensure high bond strength. The twin-roll strip casting process is one of the most modern sheet metal fabrication methods from an ecological and economic point of view. In this method, thin strips with a thickness between 1 and 8 mm are cast directly from the melt. However, this method is used only for experimental composite production between different aluminum alloys so far. The aim of the proposed project is a fundamental investigation concerning the diffusion processes to determine appropriate microstructures and mechanical properties of an aluminum-steel compound under the specific conditions of the twin-roll strip casting process.