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- Title
The relationship between TiB volume fraction and fatigue crack growth behavior in the in situ TiB/A356 composites.
- Authors
Wang, Feifei; Meng, Xiangqi; Ma, Naiheng; Xu, Jianming; Li, Xianfeng; Wang, Haowei
- Abstract
The relationship between TiB volume fraction and fatigue crack growth behavior in the A356 alloy matrix composites reinforced with 3, 5.6, and 7.8 vol% in situ TiB particles has been investigated. The mechanisms of crack propagation in the TiB/A356 composites were also discussed. The results show that the 3 vol% TiB/A356 composite has nearly the same crack growth behavior as the matrix alloy, while the 5.6 vol% TiB/A356 composite exhibits a little bit faster crack growth rate. The 7.8 vol% TiB/A356 composite presents the lowest resistance to crack growth, indicating that the crack growth is accelerated by increasing TiB volume fraction. Fractographies reveal that an increase in TiB volume fraction results in a change from the formation of striation and slip to the failure of voids nucleation, growth, and coalescence. Cracks tend to propagate within the matrix and avoid eutectic silicon and TiB particles in the intermediate Δ K region, while prefer to propagate along interfaces of eutectic silicon and TiB particles and link the fractured eutectic silicon particles in the near fractured Δ K region. Furthermore, the propensity for the separation of TiB increases with the increase in TiB volume fraction. The massive voids caused by fractured eutectic silicon and separated TiB particles propagate and coalesce, and then accelerates the crack growth in TiB/A356 composites.
- Subjects
MATERIAL fatigue; TITANIUM; BORON; CRACK propagation (Fracture mechanics); ALLOYS; EUTECTICS; SILICON; NUCLEATION
- Publication
Journal of Materials Science, 2012, Vol 47, Issue 7, p3361
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-011-6179-z