Higher performance aluminum pressure die-cast alloys through refining

通过精炼获得更高性能的铝压铸合金

• 批准号: 525876860
• 负责人: Professorin Dr.-Ing. Carolin Körner
• 金额: --
• 依托单位: Lehrstuhl Werkstoffkunde und Technologie der Metalle
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/525876860?language=en
• 关键词: Higher; performance; aluminum; pressure; die

Alloy and process development for aluminum pressure die-casting has until now been characterized by good castability and high strength coupled with good ductility. Refined pressure die-casting alloys have so far received little attention, since the aim of refinement is to refine the silicon precipitations, which in contrast to sand and permanent mold casting are already very fine in pressure die-casting due to the high cooling rates. However, new challenges, in particular due to electro-mobility, are now also bringing the thermal and electrical conductivity of the components into focus. The aim of this proposal is to systematically research the effect of refining conventional pressure die-cast alloys (AlSi9Cu3(Fe), AlSi10MgMn and AlSi12Cu1(Fe)) with strontium and finally to use it specifically to significantly (> 20%) improve the conductivity of aluminum die-cast components without affecting other properties. The aim of the refinement is to convert the normally plate-shaped, compact Si precipitations into interpenetrating structures with the matrix in order to considerably reduce their high electrical and thermal resistance. Subsequent heat treatments adapted to the refinement should further increase this effect and also help to increase the conductivity through the formation of precipitations and the associated reduction in the content of solid solution hardeners in the matrix. Furthermore, an understanding of how the conductivity develops within a die-cast component and in particular as a function of the cast wall thickness as a function of the alloy composition and the process parameters will be developed. Based on these findings, a targeted selection of suitable refinement contents, process strategies and heat treatment strategies to increase the conductivity of pressure die-cast components will ultimately be derived.

到目前为止，铝压力压铸用合金和工艺发展的特点是铸造性好、强度高、延展性好。到目前为止，精炼压力压铸合金受到的关注很少，因为精炼的目的是精炼硅沉淀，与砂和永久模铸造相比，由于冷却速度高，压力压铸中的硅沉淀已经非常精细了。然而，新的挑战，特别是由于电动汽车，现在也使组件的导热性和导电性成为焦点。本提案的目的是系统研究用锶精炼常规压力压铸合金(AlSi9Cu3（Fe)， AlSi10MgMn和AlSi12Cu1(Fe)）的效果，并最终专门用于显著（> 20%）提高铝压铸部件的导电性而不影响其他性能。改进的目的是将通常呈板状、致密的Si析出物转化为与基体互穿的结构，以显著降低其高电阻和热阻。适应于细化的后续热处理应进一步增加这种效果，并且还有助于通过形成沉淀和相应减少基体中固溶体硬化剂的含量来增加导电性。此外，对电导率如何在压铸部件中发展的理解，特别是作为铸壁厚度的函数，作为合金成分和工艺参数的函数，将得到发展。基于这些发现，有针对性地选择合适的细化含量，工艺策略和热处理策略，以提高压力压铸部件的导电性将最终导出。