Mechanical properties and hydrogen tolerance of particle-reinforced CCA produced by additive manufacturing (MarioCCArt)

通过增材制造生产的颗粒增强 CCA 的机械性能和氢耐受性 (MarioCCArt)

• 批准号: 388738622
• 负责人: Professor Dr. Gerhard Dehm
• 金额: --
• 依托单位: Abteilung Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/388738622?language=en
• 关键词: Mechanical; properties; hydrogen; tolerance; particle

In the first funding period, the process chain for the synthesis of particle-reinforced HEA/CCA (High Entropy Alloys / Compositionally Complex Alloys) via gas atomization of powders and Laser Powder Bed Fusion (L-PBF) was established. We processed alloys in the family CoCrFeNi(-Al,-Mn) and investigated strengthening via spinodal decomposition, oxide and nitride precipitation. Continuing with this work, we will concentrate in the follow-up project on the most successful of these alloys (no crack formation in L-PBF, single-phase matrix) for more application-driven research. Two alloys will be investigated, both single-phase A1 (fcc), one HEA and one conventional alloy for reference. These alloys will be reinforced by particles of various chemical composition and size. The impact of these different particle sizes and compositions on processability in different ex-situ and in-situ process routes in L-PBF will be determined and the mechanical properties of the resulting particle-reinforced CCA (p-CCA) will be determined, including strength, fracture toughness and fatigue strength. Additionally, the influence of hydrogen and of low temperatures on the mechanical properties and on the microstructure will be a focus of the project. The goal of these analyses is to develop a strong, tough, fatigue- and hydrogen-resistant material. To this end, the mechanical properties and the mechanisms of plastic deformation of the p-CCA and reference alloys before and after gaseous hydrogen charging will be investigated at room temperature and at low temperatures. To understand the impact of hydrogen on plastic deformation and failure mechanisms, additionally a nanoindenter including an electrochemical charging cell will be used. The results lay the foundation of the application of p-CCA in the hydrogen economy.

在第一个资助期间，建立了通过粉末气体雾化和激光粉末床融合（L-PBF）合成颗粒增强HEA/CCA（高熵合金/成分复杂合金）的工艺链。我们加工了 CoCrFeNi(-Al,-Mn) 系列合金，并研究了通过旋节线分解、氧化物和氮化物沉淀进行强化。继续这项工作，我们将在后续项目中集中研究这些合金中最成功的（L-PBF，单相基体中不形成裂纹），以进行更多应用驱动的研究。将研究两种合金，均为单相 A1 (fcc)、一种 HEA 和一种传统合金以供参考。这些合金将通过各种化学成分和尺寸的颗粒进行增强。将确定这些不同的颗粒尺寸和成分对 L-PBF 中不同非原位和原位加工路线的加工性能的影响，并将确定所得颗粒增强 CCA (p-CCA) 的机械性能，包括强度、断裂韧性和疲劳强度。此外，氢和低温对机械性能和微观结构的影响将是该项目的重点。这些分析的目标是开发一种坚固、坚韧、抗疲劳和抗氢的材料。为此，将在室温和低温下研究气态充氢前后p-CCA和参考合金的机械性能和塑性变形机制。为了了解氢对塑性变形和失效机制的影响，还将使用包含电化学充电电池的纳米压痕仪。研究结果为p-CCA在氢经济中的应用奠定了基础。