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Mechanism and kinetic model of in-situ TiB2/7055Al nanocomposites synthesized under high intensity ultrasonic field

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Abstract

In-situ TiB2/7055Al nanocomposites are fabricated by in situ melt chemical reaction from 7055Al-K2TiF6-KBF4 system under high intensity ultrasonic field, and the mechanism and kinetic model of insitu melt chemical reaction are investigated. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses indicate that the sizes of in-situ TiB2 nanoparticles are in the range of 80–120 nm. The results of icewater quenched samples show that the whole process contains four stages, and the overall in-situ reaction time is 10 minutes. The in situ synthesis process is controlled mainly by chemical reaction in earlier stage (former 3 minutes), and by the particulate diffusing in later stage. The mechanism of key reaction between Al3Ti and AlB2 under high intensity ultrasonic in the 7055Al-K2TiF6-KBF4 system is the reaction-diffusion-crack-rediffusion. Furthermore, the reactive kinetic models in 7055Al-K2TiF6-KBF4 system are established.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China

    Dengbin Chen  (陈登斌), Yutao Zhao  (赵玉涛), Guirong Li, Meng Zheng & Gang Chen

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  1. Dengbin Chen  (陈登斌)
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  2. Yutao Zhao  (赵玉涛)
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  3. Guirong Li
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  4. Meng Zheng
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  5. Gang Chen
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Corresponding author

Correspondence to Yutao Zhao  (赵玉涛).

Additional information

Funded by the National 863 High Technology Research Program (No.2007AA03Z548), National Natural Science Foundation of China (No.50971066), Research Fund for the Doctoral Program of Higher Education of China (No.20070299004), Jiangsu Provincial ‘333’ Project of Training the High-level Talents Foundation (No.2008-46) and Jiangsu Provincial Science Supporting Item (No.BE2009127)

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Chen, D., Zhao, Y., Li, G. et al. Mechanism and kinetic model of in-situ TiB2/7055Al nanocomposites synthesized under high intensity ultrasonic field. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 26, 920–925 (2011). https://doi.org/10.1007/s11595-011-0337-7

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  • DOI: https://doi.org/10.1007/s11595-011-0337-7

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