成形制造过程中产生的随机损伤是航空发动机钛合金叶片不可避免的问题，严重影响了叶片疲劳性能与服役寿命。本项目提出叶片随机损伤电磁靶向修复新思路，通过多能级交变电磁场耦合作用，使处于较高能量状态的损伤微区的原子/空位/位错移动以实现随机损伤靶向修复，同时使处于较高能量状态的亚稳相组织转变为新的稳定相组织以实现微区相组织调控，进而大幅度提高叶片性能寿命。本项目拟选用TC11钛合金叶片试样为对象，综合进行电磁场耦合处理、过程数值模拟、材料组织性能试验等，研究电磁处理工艺条件对钛合金叶片微观组织结构及性能的影响规律，揭示交变电磁场作用下叶片随机损伤靶向修复机制，建立叶片组织性能电磁协同调控方法，为高性能长寿命钛合金叶片电磁场强韧化处理技术提供科学依据。项目研究对于发展航空发动机钛合金叶片新一代制造技术具有重要学术价值和实际意义。

The generation of random damage during forming manufacturing of aero-engines titanium alloy blade is inevitable, which seriously influences its fatigue performance and service life. Thus, an innovative concept that is to make electromagnetic targeted repair of these random damage has been put forward. By coupling multi-level alternating electromagnetic field, random damage will be repaired in the consequence of the motion of atomic/vacancy/dislocation with higher energy state in micro area; also, the phase organization in micro area will be improved as a result from the transformation of a metastable phase-structure with a higher energy state to stable phase-structure. As a result, the service life of blades will increase. Accordingly, sample of TC11 titanium alloy blade have been chosen as the test object to study this technology by adopting process numerical simulation, detection technology for the microstructure of materials. The detailed research content include: 1) influence rule of electromagnetic processing technology, experiments will be carried out to investigate the effect of processing parameters on the microstructure and properties of blade samples; 2) role mechanism of electromagnetic processing technology, the influence mechanism of electromagnetic field on the microstructure of blade samples will be analyzed based on the experimental results; 3) regulative methods of electromagnetic processing technology, models will be established to analyze the association mechanism between the microstructure and properties of blade samples under the effect of electromagnetic field. And then coordinated regulation method of the microstructure and performance of blades under the effect of electromagnetic field will be built. It will provide scientific basis for the strengthening and toughening treatment of blades with high performance and long life under the effect of electromagnetic field. This research has important academic value and practical significance for developing a new generation manufacturing technology of aero-engine titanium alloy blade.