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）的典型成分为 0.6-0.9%Mg 和 0.5-0.9%Si，由于其高导电率和具体强度。然而，电导率对合金添加物高度敏感，因为较高的镁和硅含量会由于溶质原子对传导电子的散射增加而显着恶化电导率。此外，导电率和导热率之间存在直接的正比关系。传统的Al-Mg-Si合金采用固溶热处理、水淬、变形和人工时效的热机械加工，以实现良好的导电率和机械强度。在 AlMgSi 中添加少量 Cu 形成四元 AlMgSiCu 合金，在热机械加工路线后具有优异的机械强度。因此，人们可以探索这种AlMgSiCu合金在电动汽车布线系统和电动汽车电池模块冷却系统中的潜在应用，以实现轻量化战略。然而，没有关于此类 AlMgSiCu 合金的热机械加工和合金化学对导电和导热性能影响的信息。该研究项目的主要目的是建立对合金化学和AlMgSiCu合金加工（包括熔化、挤压、形变热处理）对所得微观结构、导电率和机械性能的影响的基本了解，从而开发下一代高耐热材料。和用于汽车应用的导电铝合金。将结合光学/电子显微镜和涡流方法对加工后的切片进行分析，以了解成分和加工条件对微观结构、强度和电导率的影响。