Mechanism-based investigation of additively-manufactured aluminium matrix composites (AMC) for enhanced mechanical strength

基于机理的增材制造铝基复合材料 (AMC) 增强机械强度研究

• 批准号: 425479688
• 负责人: Dr.-Ing. Philipp Imgrund, since 9/2020
• 金额: --
• 依托单位: Institut für Laser- und Anlagensystemtechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/425479688?language=en
• 关键词: Mechanism; based; investigation; additively; manufactured

The processing of aluminium matrix composite (AMC) powders by means of additive manufacturing will offer the possibility to manufacture tailor-made AMC components. It requires a detailed investigation of involved chemical reactions, composition and phase transformations during high energy ball milling (HEBM) and the selective laser melting (SLM) processing. The main focus is on SiC particles reinforced AlSi10Mg powder. The following scientific questions are to be investigated: How does the shape of the composite powder particles effect the processibility by means of SLM? What is the role of process control agent residues during SLM? How do the typical properties of HEBM microstructures influence the processing by SLM? Which defects occur in SLM for the HEBM-processed AMC powders? How do the microstructures of SLM-processed materials influence the mechanical properties? Fatigue behaviour plays an important role in structural applications. The specific microstructure and remnant porosity induced by the SLM process reflects complicated fatigue damage phenomena. Secondary phase reinforcements are foreseen to result in different cyclic loading interactions with microstructural constituents. Interfaces at reinforcements and phase boundaries are expected to induce multiple damage and failure initiation. This challenge dictates that understanding of multi-scale strength attributes of macro- and micro-level structures is necessary. The findings obtained from mechanical tests and microstructural investigations will be used to understand mutual interaction between manufacturing and properties at various scales and investigate: What are the most sensitive process parameters? How do the processing routes effect the mechanical properties (fatigue behaviour, tolerances against manufacturing deviations)? The basic understanding of deformation mechanisms in the SLM-AMC process chain will open the door for further effective exploitation in industrial and structural applications and will highlight future fundamental research aspects.

通过增材制造对铝基复合材料（AMC）粉末进行加工，将为制造定制的AMC部件提供可能性。这需要详细研究高能球磨（HEBM）和选择性激光熔化（SLM）加工过程中所涉及的化学反应、成分和相变。主要研究了SiC颗粒增强AlSi 10 Mg粉末。以下科学问题有待研究：复合粉末颗粒的形状如何影响SLM的加工性能？可持续土地管理过程中过程控制剂残留物的作用是什么？HEBM微结构的典型特性如何影响SLM的加工？HEBM处理的AMC粉末在SLM中会出现哪些缺陷？SLM加工材料的微观结构如何影响其力学性能？疲劳性能在结构应用中起着重要的作用。由SLM工艺引起的特定显微组织和残余孔隙反映了复杂的疲劳损伤现象。第二相增强预见到导致不同的循环载荷与微观结构成分的相互作用。界面处的钢筋和相边界，预计会引起多个损伤和故障启动。这一挑战表明，理解宏观和微观结构的多尺度强度属性是必要的。从机械测试和微观结构调查获得的结果将用于了解制造和性能之间的相互作用，在各种规模和调查：什么是最敏感的工艺参数？加工路线如何影响机械性能（疲劳性能、制造偏差公差）？对SLM-AMC工艺链中变形机制的基本理解将为工业和结构应用中的进一步有效开发打开大门，并将突出未来的基础研究方面。