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.

冷喷涂是一种可以被认为是相加修复过程的修复过程，在相对较低的温度下，金属粉末颗粒在载气中高速撞击，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。基体和新涂层之间不断演变的微观组织和残余应力状态意味着CS结构目前不能用于高应力部位，因为人们对其力学性能还没有很好的了解。需要更好地理解这种分层系统中的微观机械过程如何控制疲劳和腐蚀的相互作用。这是空中客车运营公司与考文垂大学合作支持的一个更大的研究项目的一部分。该项目将使用先进的微观结构表征技术(扫描电子显微镜、EBSD、EDX、透射电子显微镜和X射线CT)来分析CS微观结构的演变和缺陷分布，还将研究全场实验力学方法(例如DIC和EC-AFM)，以评估疲劳加载和存在腐蚀服务条件下的应变演化和腐蚀过程。