Development of an alloying element-specific flow curve model for aluminium alloys

铝合金合金元素特定流动曲线模型的开发

• 批准号: 230561678
• 负责人: Dr.-Ing. Benjamin Milkereit
• 金额: --
• 依托单位: Lehrstuhl für Skalenübergreifende Thermodynamische und Kinetische Simulation
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/230561678?language=en
• 关键词: Development; alloying; element; specific; flow

Process chain simulations of aluminium alloys are well developed. But since the important process of precipitation hardening, especially during quenching, could not be considered so far, there is a serious gap in the simulations.The mechanical properties of aluminium alloys are influenced by the microstructural state of the solid solution. The available alloying elements are either solved or partly embodied in precipitates of secondary phases. Measurements of the precipitation kinetics during quenching have been enabled only recently. Moreover, changes of the micro-chemical composition have been considered in simulations only with insufficient accuracy.The aim of the project is to establish an element-specific, physical material model for the mechanical characteristics of aluminium alloys under real quenching and annealing conditions. This material model is supposed to simulate flow curves in dependency of temperature and cooling rate for various alloy compositions. Perspectively, such simulations of flow curves can be integrated into FEM-simulations, with which distortions and residual stresses during quenching of aluminium components are simulated.In Aachen, the model 3IVM(+) has been in development and in use for a long time, which can simulate flow curves. However, it considers the micro-chemical influences on plastic flow insufficiently and is not suitable for small strains as in quenching distortions. For the remodelling, physical approaches exist, but they need to be realised and examined in detail. For this, the cooperation of the IMM (Aachen) and the LWT (Rostock) offers ideal conditions: With the unique equipment and the expertise at the LWT, the solution and precipitation states can be specifically selected and investigated in order to support and validate the modelling at the IMM.One subgoal is to understand the dependency of the precipitation kinetics on the type and concentration of the alloying elements, as well as their interactions. Furthermore, the connection between the solution state and the mechanical behaviour are to be worked out in a way that opens up an advanced applicability of the model. For this, investigations of highly pure laboratory alloys of the binary systems Al-Mg and Al-Si, as well as ternary Al-Mg-Si variations, are scheduled.Ultimately in this project, element specific parameters are generated which, in a broader sense, have the character of natural constants for the interaction between aluminium and its alloy elements. Such constants represent a particularly sustainable value, and with good success of the modeling, the path for other solution elements is traced.

铝合金的工艺链模拟已经发展得很好。但由于对沉淀硬化这一重要过程，特别是淬火过程的模拟至今未能考虑，因此模拟结果存在较大差距。可用的合金元素或者固溶或者部分地包含在第二相的沉淀物中。淬火过程中的沉淀动力学的测量最近才得以实现。此外，微观化学成分的变化仅在模拟中考虑，但精度不够。该项目的目的是建立一个元素特定的物理材料模型，用于描述铝合金在真实的淬火和退火条件下的力学特性。该材料模型可以模拟各种合金成分的流动曲线随温度和冷却速率的变化。在亚琛，3 IVM（+）模型已经开发并使用了很长时间，它可以模拟流动曲线。但该方法对微观化学因素对塑性流动的影响考虑不足，且不适用于淬火畸变等小应变情况。对于改造，物理方法是存在的，但它们需要实现和详细检查。为此，IMM（亚琛）和LWT（罗斯托克）的合作提供了理想的条件：借助LWT的独特设备和专业知识，可以专门选择和研究固溶和沉淀状态，以支持和验证IMM的建模。一个子目标是了解沉淀动力学对合金元素类型和浓度的依赖性，以及它们之间的互动。此外，解决方案状态和力学行为之间的连接是制定了一种方式，开辟了先进的模型的适用性。为此，计划对二元系Al-Mg和Al-Si以及三元系Al-Mg-Si的高纯实验室合金进行研究。最终，在该项目中，生成元素特定参数，这些参数在更广泛的意义上具有铝及其合金元素之间相互作用的自然常数的特征。这些常数代表了一个特别可持续的价值，随着建模的成功，其他解决方案元素的路径被跟踪。

项目成果

Correlation between Supersaturation of Solid Solution and Mechanical Behaviour of Two Binary Al-Si-Alloys

两种二元铝硅合金固溶过饱和度与力学行为的相关性

• DOI: 10.4028/www.scientific.net/msf.794-796.508
• 发表时间: 2014
• 期刊: Materials Science Forum
• 作者: P. Schumacher;M. Reich;V. Mohles;S. Pogatscher;P. J. Uggowitzer;B. Milkereit
• 通讯作者: B. Milkereit

Yield Strength Model for Undercooled Aluminium Alloys Based on Calorimetric In-Situ Quenching Experiments

基于量热原位淬火实验的过冷铝合金屈服强度模型

• DOI: 10.1007/978-3-319-48170-8_14
• 发表时间: 2015
• 作者: M. Reich;P. Schumacher;B. Milkereit;O. Kessler
• 通讯作者: O. Kessler

Quench-induced precipitates in Al-Si alloys: Calorimetric determination of solute content and characterisation of microstructure

• DOI: 10.1016/j.tca.2014.12.023
• 发表时间: 2015-02-20
• 期刊: THERMOCHIMICA ACTA
• 影响因子: 3.5
• 作者: Schumacher, Philipp;Pogatscher, Stefan;Milkereit, Benjamin
• 通讯作者: Milkereit, Benjamin