Synthesis of Non-Equlibrium Alloys by Friction Stir Processes

搅拌摩擦法合成非平衡合金

• 批准号: 310621524
• 负责人: Professor Dr. Ferdinand Haider
• 金额: --
• 依托单位: Lehrstuhl für Betriebswissenschaften und Montagetechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/310621524?language=en
• 关键词: Synthesis; Non; Equlibrium; Alloys; Friction

Friction Stir Welding (FSW) is a solid-state joining technique in which the adhesive bonding is produced by a local plastification and mechanical stirring the abutting surfaces of the joining partners.The achieved joint properties can reach very high qualities due to the finegrained microstructure, which is caused by the dynamic recrystallization of the material in the process zone. This advantageous modification of the microstructure is targeted at Friction Stir Pro-cessing (FSP). Instead of joining a pure material treatment is the aim of this process variant. The FSP is used to refine the microstructure of workpieces locally. Both Friction Stir techniques (FSW and FSP) have in common, that usually no filler metal is used. However, the possibility of thermomechanical alloying by Friction Stir techniques is absolutely given. Several scientific publications indicate, that for example through the FSP technique solid connections and occasionally even a verifiable alloying between the inserted additives and the base material are producible. Furthermore, as part of the preparatory work, it was shown, that a specific alloying of FSW seam with a welding filler metal is basically possible by the formation of intermetallic phases in the solid state. However, the described results are mainly based on material science investigations and have rarely been attributed to procedural operations. Thus, a comprehensive knowledge of the alloy forming processes, their influencing variables and a way to control this process through technical procedures still lacks. The aim of the project is to gain understanding of the possible application of Friction Stir techniques as a method for the production of non-equilibrium alloys or of materials with locally modified composition. For this, a deepened understanding of the process related requirements on the one hand and on the other hand of the metallurgical operations during the mechanical alloying of metals by Friction Stir techniques will be investigated. The research of production engineering will focus on a homogeneous distribution of the applied filler material and determining or generating a suitable process temperature. Referring to material science the focus will be on the analysis of alloying and the properties of the produced alloys. The new acquired knowledge will finally lead to a coupled process and material model for describing the mechanism of alloy formation and controlling.

搅拌摩擦焊（FSW）是一种固态连接技术，通过局部塑化和机械搅拌使连接件的对接面产生粘接，由于在焊接过程中材料发生动态再结晶，形成细晶组织，接头性能可达到很高的质量。这种有利的微观结构的修改是针对搅拌摩擦加工（FSP）。该工艺变体的目的不是加入纯材料处理。FSP用于局部细化工件的显微组织。两种摩擦搅拌技术（FSW和FSP）的共同点是通常不使用填充金属。然而，完全给出了通过摩擦搅拌技术进行热机械合金化的可能性。一些科学出版物表明，例如通过FSP技术，可以在插入的添加剂和基础材料之间产生牢固的连接，有时甚至是可验证的合金化。此外，作为准备工作的一部分，已经表明，通过固态金属间相的形成，FSW焊缝与焊接填充金属的特定合金化基本上是可能的。然而，所描述的结果主要基于材料科学研究，很少归因于程序操作。因此，仍然缺乏对合金成形过程、其影响变量以及通过技术程序控制该过程的方法的全面了解。该项目的目的是了解摩擦搅拌技术作为生产非平衡合金或局部改变成分的材料的方法的可能应用。为此，一方面将深入了解与工艺相关的要求，另一方面将研究通过摩擦搅拌技术进行金属机械合金化过程中的冶金操作。生产工程的研究将集中在所应用的填充材料的均匀分布和确定或产生合适的工艺温度。在材料科学方面，重点将放在合金化和所生产合金的性能分析上。新获得的知识将最终导致一个耦合的过程和材料模型来描述合金的形成和控制的机制。