Low-cycle fatigue behavior and damage progression of a fiber reinforced titanium matrix composite

International Journal of Lightweight Materials and Manufacture

Rui Yang¹  Ying Wu²  Yumin Wang²  Guoxing Zhang²  Xu Zhang²  Lina Yang²  Xu Kong²  Qing Yang² 

[1] Corresponding author.;Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;

关键词: Metal matrix composites;    Titanium alloy;    Fatigue;    Acoustic emission;   

DOI  :  

来源: DOAJ

【 摘 要 】

The low-cycle fatigue behavior and damage progression of a SiC fiber reinforced Ti–6Al–2Sn–4Zr–2Mo-0.1Si matrix composite was investigated systematically. The fatigue life increased from 4 to 52388 cycles when the maximum stress decreased from 1500 MPa to 1100 MPa. The modulus calculated from the stress-strain response exhibited little variation for all the specimens during the fatigue process. Fractographic observations showed that the fatigue cracks initiated internally and propagated preferentially in the internal sputtered matrix instead of the unreinforced matrix in the external layer for the cylindrical specimen. The proportion of the fatigue region in the fracture surface increased as the applied stress level decreased. The internally-progressed damage, especially breaks of bridging fibers, was well characterized in situ by the acoustic emission system.

【 授权许可】

Unknown