基本信息
项目批准号：51801115
申请代码：E0103
项目名称：搅拌摩擦加工镍铝青铜合金耐腐蚀疲劳组织优化及机理研究
项目负责人：
吕玉廷
依托单位：
山东科技大学
研究期限：2019-01-01 至 2021-12-31
资助经费：23.0（万元）
项目摘要
中文摘要：
搅拌摩擦加工是解决镍铝青铜合金严重腐蚀疲劳破坏问题的最有效途径之一，获得搅拌摩擦加工镍铝青铜合金耐腐蚀疲劳性能的理想组织，并阐明其腐蚀疲劳机理是该领域亟待要解决的关键问题。因此，本项目围绕搅拌摩擦加工镍铝青铜合金四种典型组织的腐蚀疲劳行为开展研究工作，采用EBSD技术对腐蚀疲劳裂纹扩展路径进行表征，掌握腐蚀疲劳裂纹扩展的晶体学特性，基于裂纹扩展路径的显微组织定量分析和断口观察，阐明组织状态与耐腐蚀疲劳性能的响应关系，确定各组织的耐腐蚀疲劳优劣顺序，通过FIB辅助TEM探究裂纹尖端周围物质的组织结构和化学成分，并结合裂纹路径上物质化学成分的定量分析，明确裂纹尖端氧化和腐蚀产物传送规律，利用裂纹尖端塑性区的有限元模拟和实验表征，阐明裂纹尖端塑性变形的力学机理，最终揭示加工合金的腐蚀疲劳机理，为镍铝青铜合金的组织调控提供理论指导。
英文摘要：
Friction stir processing (FSP) is one of the most effective ways to solve the problem of serious corrosion fatigue damage of nickel aluminum bronze (NAB) alloy. Obtaining optimum microstructures with the best corrosion fatigue resistance and revealing its corrosion fatigue mechanisms are the key issues in this field needing to be resolved at present. Therefore, in this project, four typical microstructures of FSPed NAB alloy and their corrosion fatigue behaviors are the main study object. EBSD characterization of corrosion fatigue growth path is performed to understand the crystallographic features of crack growth. Based on quantitative microstructure analysis and fracture observation of corrosion fatigue crack growth path, the response relation between microstructural state and corrosion fatigue properties is revealed, and then superior order of various microstructures of corrosion fatigue resistance is ensured. For understanding crack tip oxidation and material transmission law, phase structures and chemical composition of material around corrosion fatigue crack tip are determined by TEM assisted by FIB, and quantitative analysis of chemical composition on crack propagation path is performed. Mechanical mechanism of plastic deformation in crack tip is revealed via finite element modelling and experimental characterization of crack tip plastic area. Finally, based on above analysis, corrosion fatigue mechanisms of FSPed NAB alloy are revealed. The achievements obtained in this project can provide theoretical support for microstructure modification of NAB alloy.
——来自https://kd.nsfc.gov.cn/
