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，可以认为是一种增材修复工艺，金属粉末颗粒在载气中、在相对较低的温度下受到高速冲击，因此修复的表面层是通过极端变形而不是熔化和凝固形成的。不断发展的微观结构以及基材和新涂层之间的残余应力状态意味着 CS 结构目前尚未用于高应力位置，因为它们的机械性能尚不清楚。需要更好地了解该分层系统中的微机械过程如何控制疲劳和腐蚀相互作用。这是空客运营部与考文垂大学合作支持的大型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）来分析 CS 微观结构和缺陷分布的演变，还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。