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Strain-rate sensitivity of aluminum 2024-T6/TiB2 composites and aluminum 2024-T6

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Abstract

Strain-rate sensitivities of 55vol%–65vol% aluminum 2024-T6/TiB2 composites and the corresponding aluminum 2024-T6 matrix were investigated using split Hopkinson pressure bar method. The experimental results showed that 55vol%–65vol% aluminum 2024-T6/TiB2 composites exhibited significant strain-rate sensitivities, which were three times higher than the strain-rate sensitivity of the aluminum 2024-T6 matrix. The strain-rate sensitivity of the aluminum 2024-T6 matrix composites rose obviously with increasing reinforcement content (up to 60%), which agreed with that from the previous researches. But it decreased as the ceramic reinforcement content reached 65%. After high strain rates compression, a large number of dislocations and micro-cracks were found inside the matrix and the TiB2 particles, respectively. These micro-cracks can accelerate the brittle fracture of the composites. The aluminum 2024-T6/TiB2 composites showed various fracture characteristics and shear instability was the predominant failure mechanism under dynamic loading.

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Authors and Affiliations

  1. School of Mechanical and Automobile Engineering, South China University of Technology, Guangzhou, 510640, China

    Dezhi Zhu  (朱德智) & Qi Chen

  2. School of Mechanical and Electronic Engineering, Guangdong Polytechnic Normal University, Guangzhou, 510665, China

    Zhenxing Zheng  (郑振兴)

Authors
  1. Dezhi Zhu  (朱德智)
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  2. Zhenxing Zheng  (郑振兴)
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  3. Qi Chen
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Corresponding author

Correspondence to Zhenxing Zheng  (郑振兴).

Additional information

Funded in part by the Fundamental Research Funds for the Central Universities, SCUT (2013ZZ014), the Natural Science Foundation of Guangdong Province ( No. S2013010013269), the Doctoral Program Foundation of Institutions of Higher Education of China (No.20130172120027) and the National Engineering Research Center Open Fund of SCUT(2011007B)

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Zhu, D., Zheng, Z. & Chen, Q. Strain-rate sensitivity of aluminum 2024-T6/TiB2 composites and aluminum 2024-T6. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 256–260 (2015). https://doi.org/10.1007/s11595-015-1135-4

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  • DOI: https://doi.org/10.1007/s11595-015-1135-4

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