(1. 西北工业大学 材料学院，西安 710072；2. 西北有色金属研究院，西安 710016)
摘 要: 研究了损伤容限型TC4-DT钛合金疲劳裂纹扩展速率da/dn等损伤容限性能，分析不同应力比条件下片状组织与双态组织的疲劳裂纹扩展特性。研究结果为高损伤容限型钛合金的微观组织设计和探讨微观组织对损伤容限性能的影响机理提供便利。
关键字: 损伤容限钛合金；显微组织；疲劳裂纹扩展速率；断裂韧性
（1. School of Materials and Engineering, Northwestern Polytechnical University, Xi’ an 710072, China;
2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The fatigue crack growth rate of TC4-DT damage tolerance titanium alloy was investigated. Fatigue crack propagation feature was studied in lamellar and bi-modal structure at different stress ratios. The research result can lay the foundary for micro-design of high damage tolerance titanium alloy and discussion on the mechanism for effect of microstructure on damage tolerance properties.
Key words: damage tolerance titanium alloy; microstructure; fatigue crack propagation rate, fracture toughness
