Synergetic Effect of Surface-active Metallic Additions on Structure Modification in Aluminium Alloys

表面活性金属添加对铝合金结构改性的协同效应

• 批准号: 2625304
• 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: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2625304
• 关键词: Synergetic; Effect; Surface; active; Metallic

Main current means to control structure in wrought Al alloys is by adding grain-refining master alloys with insoluble particles (borides or carbides). This produces substantial grain refinement but not necessarily affect the distribution of eutectic particles or internal dendritic structure. In some groups of alloys, e.g. free-machining or recycled alloys, the size distribution and morphology of these secondary particles (soft or hard/brittle particles) as well as the internal dendritic structure of grains are of paramount importance and currently not well controlled unless special external physical fields (electromagnetic, mechanical or ultrasonic) are used. In addition, free-machining aluminium alloys rely currently on additions of Pb that need to be phased out due to the environmental and health requirements. Hence the search for the chemical means to produce good -quality free-machining and/or recycled alloys with beneficial size, morphology and spatial distribution of soft and hard phase particles is timely and necessary.

目前控制变形铝合金组织的主要手段是通过添加具有不溶性颗粒（硼化物或碳化物）的晶粒细化中间合金。这产生实质性的晶粒细化，但不一定影响共晶颗粒或内部枝晶结构的分布。在某些合金组中，例如易加工或回收合金，这些二次颗粒（软或硬/脆颗粒）的尺寸分布和形态以及晶粒的内部枝晶结构是至关重要的，并且目前没有得到很好的控制，除非使用特殊的外部物理场（电磁场、机械场或超声场）。此外，易切削铝合金目前依赖于铅的添加，由于环境和健康要求，铅需要逐步淘汰。因此，寻找化学方法来生产具有有利的尺寸、形态和软相和硬相颗粒的空间分布的高质量易切削和/或再循环合金是及时和必要的。