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Microcrack nucleation and its effect on the plastic deformation of FL γ-TiAl alloy

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Abstract

Microcracks and their effect on the plastic deformation of γ-TiAl alloy with fully lamellar microstructure (FL) at relatively low strain rate (1 × 10−5/s) has been investigated. It is found that a large number of microcracks nucleate within the grains. The microcrack density increases with the increase of grain size. Most of the microcracks nucleate at the γ/α2 interfaces and gather at grains with soft-orientations. Based on the observation and analysis, a model of microcrack nucleation in FL γ-TiAl alloy is built up. The plastic elongation of γ-based TiAl alloys with FL microstructure changes non-monotonously with the increase of grain size, which results from cooperation of micro-deformations and microcracks.

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Authors and Affiliations

  1. Key Laboratory of Radiation Beam Technology and Materials Modification of Ministry of Education, Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing, 100875, People's Republic of China

    R. T. Zheng

  2. Material Science and Engineering Department, Beijing University of Aeronautics and Astronauts, Beijing, 100083, People's Republic of China

    Y. G. Zhang & C. Q. Chen

Authors
  1. R. T. Zheng
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  2. Y. G. Zhang
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  3. C. Q. Chen
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Zheng, R.T., Zhang, Y.G. & Chen, C.Q. Microcrack nucleation and its effect on the plastic deformation of FL γ-TiAl alloy. Journal of Materials Science 39, 1721–1725 (2004). https://doi.org/10.1023/B:JMSC.0000016176.15217.51

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  • DOI: https://doi.org/10.1023/B:JMSC.0000016176.15217.51

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