Superimposed Dispersoid Hardening and Age Hardening of Aluminium Alloys

该项目的目标是通过叠加弥散强化和沉淀强化的新方法生产高强度铝合金。这首先需要对两种硬化机制中的温度相关动力学和沉淀形成类型有基本的材料科学理解。随后，在典型的锻造铝合金生产链（铸造、均质化、热成形、沉淀硬化）中，工艺参数将被调整到两个温度依赖性动力学，从而产生具有潜在高强度水平的材料结构。根据结果，将讨论工艺参数、材料结构和机械性能之间的材料科学相关性，并具体转移到生产链中，以进一步提高强度。铝合金EN AW AlMn0.5Mg0.5（3105），这是在很小程度上从我们自己的初步工作，将进行研究，了解叠加沉淀行为和生产链的合适的工艺参数。在另一种方法中，通过添加Zr，可以通过Al3Zr弥散体产生弥散体硬化的额外潜力。为了实现弥散体硬化和沉淀硬化的目标叠加，可以采用不同的潜在生产链方法。这些方法是基于这样的事实，即在典型的退火温度下，铝中的弥散体形成合金元素锰（和Zr）的扩散系数显著低于沉淀硬化合金元素镁和硅的扩散系数。在此基础上，目的是在工艺链的第一步中形成相对稳定的分散体，并在第二步中形成不太稳定的沉淀物。如果工艺持续时间足够短以抑制显著的锰（和Zr）扩散，则工艺链的第二步骤可以在更高的温度下进行。

The aim of the project is the production of high-strength aluminium alloys by the novel approach of superimposed dispersoid hardening and precipitation hardening. This initially requires a basic materials science understanding of the temperature dependent kinetics and types of precipitation formation in both hardening mechanisms. Subsequently, in a typical production chain of wrought aluminium alloys (casting, homogenising, hot forming, precipitation hardening), the process parameters are to be adjusted to the two temperature-dependent kinetics in such a way that material structures with potentially high strength levels result. Based on the results, the material-scientific correlations between process parameters, material structures and mechanical properties are to be discussed and specifically transferred to the production chain for a further increase in strength. The aluminium alloy EN AW AlMn0.5Mg0.5 (3105), which is to little extent known from our own preliminary work, will be investigated with regard to understanding the superimposed precipitation behaviour and suitable process parameters of the production chain. In a further approach, an additional potential for dispersoid hardening via Al3Zr dispersoids is to be created by adding Zr.For the targeted superposition of dispersoid hardening and precipitation hardening, different approaches of potential production chains are to be pursued. The approaches are based on the fact that the diffusion coefficient of the dispersoid-forming alloying element manganese (and Zr) in aluminium at typical annealing temperatures is significantly lower than the diffusion coefficient of the precipitation-hardening alloying elements magnesium and silicon. On this basis, the aim is to form the relatively stable dispersoids in a first step of the process chain and the less stable precipitates in a second step. The second step of the process chain can be carried out at higher temperatures if the process duration is short enough to suppress significant manganese diffusion (and Zr).