Feifei Wang
Shanghai Jiao Tong University
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Publication
Featured researches published by Feifei Wang.
Journal of Materials Science | 2012
Feifei Wang; Xiangqi Meng; Naiheng Ma; Jianming Xu; Xianfeng Li; Haowei Wang
The relationship between TiB2 volume fraction and fatigue crack growth behavior in the A356 alloy matrix composites reinforced with 3, 5.6, and 7.8xa0vol% in situ TiB2 particles has been investigated. The mechanisms of crack propagation in the TiB2/A356 composites were also discussed. The results show that the 3xa0vol% TiB2/A356 composite has nearly the same crack growth behavior as the matrix alloy, while the 5.6xa0vol% TiB2/A356 composite exhibits a little bit faster crack growth rate. The 7.8xa0vol% TiB2/A356 composite presents the lowest resistance to crack growth, indicating that the crack growth is accelerated by increasing TiB2 volume fraction. Fractographies reveal that an increase in TiB2 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 TiB2 particles in the intermediate ΔK region, while prefer to propagate along interfaces of eutectic silicon and TiB2 particles and link the fractured eutectic silicon particles in the near fractured ΔK region. Furthermore, the propensity for the separation of TiB2 increases with the increase in TiB2 volume fraction. The massive voids caused by fractured eutectic silicon and separated TiB2 particles propagate and coalesce, and then accelerates the crack growth in TiB2/A356 composites.
Journal of Composite Materials | 2012
Feifei Wang; Jianguo Li; Jianming Xu; Xianfeng Li; Yijie Zhang; Haowei Wang
Compared to the massive damage caused by SiC/Al2O3 particles to fracture toughness of conventional metal matrix composites in previous reports, an effective improvement in fracture toughness of Al matrix composites with 3, 5.6, and 7.8 vol.% in situ nano/submicron TiB2 has been obtained by improving the particle size and distribution. It is found that the fracture toughness of TiB2/Al composites are only slightly lower than that of the unreinforced alloy, having a mere reduction of 3% to 8%. This is because the in situ TiB2 particles can weaken the damage caused by reinforcing phases to fracture toughness due to their fine sizes, near-spherical shapes, and relatively uniform distributions. Fractography shows the dominant fracture mechanisms of TiB2/Al composites are matrix rupture, eutectic silicon particles fracture as well as TiB2 particles separation.
Journal of Composite Materials | 2012
Jianguo Li; Feifei Wang; Yijie Zhang; Mingliang Wang; Haowei Wang
The microstructure, mechanical properties and fracture behavior of AZ91D magnesium matrix composite reinforced with magnesium borate whisker fabricated by squeeze casting technique were investigated. The results indicate that magnesium borate whisker can improve the mechanical properties of AZ91D alloy significantly. Transmission electron microscope observation shows that a continuous magnesium oxide interfacial layer of about 25u2009nm thick is formed at the magnesium borate whisker/matrix interface, which is formed from the interfacial reaction between the liquid Mg and oxygen absorbed at the surface of magnesium borate whisker. The magnesium oxide interfacial layer can act as a barrier layer to prevent the further reaction between magnesium borate whisker and the liquid Mg, and may play an important role in the improvement of the mechanical properties of the composite.
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2014
Mingliang Wang; Dong Chen; Zhe Chen; Yi Wu; Feifei Wang; Naiheng Ma; Haowei Wang
Materials & Design | 2012
Feifei Wang; Jianming Xu; Jianguo Li; Xianfeng Li; Haowei Wang
Journal of Materials Science | 2011
Feifei Wang; Naiheng Ma; Yugang Li; Xianfeng Li; Haowei Wang
Materials & Design | 2013
Xiangqi Meng; Zhuoying Lin; Feifei Wang
Materials & Design | 2012
Jianguo Li; Feifei Wang; Wei Weng; Yijie Zhang; Mingliang Wang; Haowei Wang
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2017
Jiwei Geng; Gen Liu; Feifei Wang; Tianran Hong; Cunjuan Xia; Mingliang Wang; Dong Chen; Naiheng Ma; Haowei Wang
Materials & Design | 2017
Jiwei Geng; Gen Liu; Feifei Wang; Tianran Hong; Jichun Dai; Mingliang Wang; Dong Chen; Naiheng Ma; Haowei Wang