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Observation of fatigue damage process in SiC fiber-reinforced Ti-15-3 composite at high temperature

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Abstract

Unnotched SiC (SCS-6) fiber-reinforced Ti-15-3 alloy composite is subjected to a tension-tension fatigue test in a vacuum of 2×10−3 Pa at 293 and 823 K with a frequency of 2 Hz and R=0.1. Direct observation of the damage evolution process during the test is carried out by scanning electron microscopy (SEM). Test temperature dependent and independent fatigue damage behaviors are observed. The early stage fiber fractures observed at the polished surface are not influenced by the test temperature; however, matrix crack initiation and propagation behaviors differ greatly with temperature. The evolution of interface wear damage also differs with temperature, becoming more severe at 823 K, and the interface wear damage zone increases with the increase of the number of fatigue cycles. The macroscopic fatigue damage appears as a modulus reduction associated with interface sliding, matrix crack propagation, and plastic deformation of the matrix. The deformation zone of the composite tested at 823 K spreads more than that at 293 K. The fatigue life of the composite tested at 823 K is longer than that at 293 K. This behavior is related to the difference in spread of the damage zone in the matrix.

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Authors and Affiliations

  1. the National Research Institute for Metals, 305-0047, Ibaraki-ken, Japan

    Y. Tanaka (Research), C. Masuda (Reader of Laboratory) & Y. -F. Liu (Doctor)

  2. the Institute of Industrial Science, Ther University of Tokyo, 106-8558, Tokyo, Japan

    Y. Kagawa (Professor) & S. Q. Guo (Doctor)

Authors
  1. Y. Tanaka
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  2. C. Masuda
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  3. Y. -F. Liu
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  4. Y. Kagawa
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  5. S. Q. Guo
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Tanaka, Y., Masuda, C., Liu, Y.F. et al. Observation of fatigue damage process in SiC fiber-reinforced Ti-15-3 composite at high temperature. Metall Mater Trans A 30, 221–229 (1999). https://doi.org/10.1007/s11661-999-0210-x

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  • DOI: https://doi.org/10.1007/s11661-999-0210-x

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