Aerospace Al alloy cold spray coating performance under fatigue and corrosion environments

航空航天铝合金冷喷涂涂层在疲劳和腐蚀环境下的性能

• 批准号: 2889819
• 金额: --
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2889819
• 关键词: Aerospace; Al; alloy; cold; spray

Cold spray is a repair process that can be considered an additive repair process, whereby metal powder particles are impacted at high speed in a carrier gas, at relatively low temperatures, so the repaired surface layer is formed by extreme deformation rather than melting and solidification. The evolving microstructures and the residual stress states between the substrate and new coating layer mean CS structures are not currently used in highly stressed locations as their mechanical performance is not well understood. A better understanding of how the micromechanical processes in this layered system controlling fatigue and corrosion interactions is needed. This is part of a larger research project supported by Airbus Operations, in collaboration with Coventry UniversityThis project will use advanced microstructural characterization techniques (SEM, EBSD, EDX, TEM and X-ray CT) to analyse the evolution of the CS microstructure and defect distributions, and will also investigate full field experimental mechanics approaches (e.g. DIC and EC-AFM) to evaluate strain evolution and corrosion processes under fatigue loading and in the presence of corrosion service conditions.

冷喷涂是一种修复工艺，可以被认为是一种添加剂修复工艺，其中金属粉末颗粒在相对较低的温度下在载气中以高速撞击，因此修复的表面层通过极端变形而不是熔化和固化形成。基材和新涂层之间不断变化的微观结构和残余应力状态意味着CS结构目前不用于高应力位置，因为其机械性能尚未得到很好的理解。需要更好地了解如何在这个分层系统控制疲劳和腐蚀相互作用的微观力学过程。这是空中客车公司与考文垂大学合作支持的一个更大研究项目的一部分，该项目将使用先进的微观结构表征技术。（SEM、EBSD、EDX、TEM和X射线CT）分析CS微观结构和缺陷分布的演变，并将研究全场实验力学方法（例如DIC和EC-AFM），以评估疲劳载荷和腐蚀使用条件下的应变演变和腐蚀过程。