Thermomechanical processing of AlMgSiCu alloys for high electrical and thermal conductivity applications

用于高导电性和导热性应用的 AlMgSiCu 合金的热机械加工

• 批准号: 2295075
• 金额: --
• 依托单位: Brunel University London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2295075
• 关键词: Thermomechanical; processing; AlMgSiCu; alloys; electrical

Al-Mg-Si alloys (eg. 6101 and 6201 alloys) with a typical composition of 0.6-0.9%Mg and 0.5-0.9%Si, are commonly used in overhead transmission lines and other electrical engineering applications due to its high electrical conductivity and specific strength. However, the electrical conductivity is highly sensitive to alloying additions because higher magnesium and silicon contents significantly deteriorate electrical conductivity due to increased scattering of conduction electrons by solute atoms. Furthermore, there is a direct proportional relationship between electrical conductivity and thermal conductivity .Themomechanical processing involving solution heat treatment, followed by water quenching, deformation and artificial ageing has been applied to conventional Al-Mg-Si alloy to achieve good electrical conductivity and mechanical strength. Small addition of Cu to AlMgSi to form quaternary AlMgSiCu alloy has led to superior mechanical strength after thermomechanical processing route. Hence, one can explore this AlMgSiCu alloy for potential applications in the wiring systems of electric vehicles and in the cooling systems of electric vehicle battery modules to fulfil the light-weighting strategy. However, there is no information on the effect of thermomechanical processing and alloy chemistry of this type of AlMgSiCu alloy on electrical and thermal conductivity properties. The main aim of this research project is to establish a fundamental understanding of the effect of alloy chemistry and processing of AlMgSiCu alloy involving melting, extrusion, thermomechanical treatment on resultant microstructure, conductivity and mechanical properties, so as to develop the next generation of high thermal and electrical conductivity aluminium alloy for automotive applications. The processed sections will be analysed using a combination of optical/electron microscopies and eddy current method to understand the effect of composition and processing conditions on microstructure, strength and conductivity.

Al-Mg-Si合金（例如6101和6201合金）的典型组成为0.6-0.9％mg和0.5-0.9％Si，由于其高电导率和特定强度，通常用于架空传输线和其他电气工程应用中。然而，由于较高的镁和硅含量，由于溶质原子通过溶质原子增加传导电子的散射，导致较高的镁和硅含量显着恶化了电导率。此外，电导率与导热率之间存在直接比例关系。涉及溶液热处理的主体机电处理，然后将水淬灭，变形和人工衰老应用于常规的Al-MG-SI合金，以实现良好的电导率和机械强度。在Almgsi中添加Cu以形成第四纪ALMGSICU合金，导致了热机械加工途径后具有出色的机械强度。因此，人们可以探索这种Almgsicu合金，以用于电动汽车接线系统和电动汽车电池模块的冷却系统中的潜在应用，以实现轻度加权策略。但是，没有关于这种类型的ALMGSICU合金对电导和导热性特性的热机械加工和合金化学作用的信息。该研究项目的主要目的是建立对合金化学作用的基本理解以及涉及融化，挤压，热机械处理对产生的微结构，电导率和机械性能的处理的效果，以开发下一代高热和电导率铝合金的自动型适用性。将使用光学/电子显微镜和涡流方法的组合对处理的部分进行分析，以了解组成和加工条件对显微结构，强度和电导率的影响。