Achieving ultrahigh fretting fatigue endurance in TB8 titanium alloy with hierarchical structure via triggering nanocomposite and phase transformation

• DOI: 10.1016/j.matdes.2023.112419
• Publication Date: 2023-10-19T04:36:49Z
• Authors: Dan Liu; Daoxin Liu; Zhi Bai; Jing Yang; Junfeng Cui; Amin Ma; Yilong Liang; Sara Bagherifard
• Keywords: Nanocrystalline material; Titanium alloy

Extraordinary fretting fatigue endurance is critical for engineering structures prone to contact with expected long service lifetimes. Here, we propose a strategy achieve ultrahigh in titanium alloy. A special hierarchical structure, i.e. gradient amorphous-nanocrystalline grain/coarse grain, was designed TB8 alloy via surface severe plastic deformation, which forms an nanocomposite structure comprising of and nano-lamellae β α phase transformation upon repeated wear. The suppress cracks initiation propagation, resulting the high life that 30.2-times higher than original triggering exceptional phenomenon where damage-crack initiate towards interior non-fretting zone. This study provides new insight into improving alloys.