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The relationship between fracture toughness and microstructure of fully lamellar TiAl alloy

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Abstract

Fully lamellar (FL) Ti–46.5Al–2Cr–1.5Nb–1V (at%) alloy is used to study the relationship between microstructure and fracture toughness. A heat treatment process is adopted to control the microstructural parameters of the studied alloy. Fracture toughness experiments and scanning electron microscope (SEM) in-situ straining experiments are carried out to determine the influence of lamellar spacing and grain size on the fracture toughness of FL TiAl alloys. It is found that ligament length depends on the lamellar spacing, and fracture toughness varies non-monotonously with the increase of grain size. The results are ascribed to the competition between the microcrack nucleation and microcrack propagation. Finally a semi-empirical relationship between the fracture toughness and microstructure parameters was established.

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Acknowledgement

The authors would like to thank for the financial support from National Natural Science Foundation of China under the contract No. 59895150-03 and 10576003.

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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, China

    R. T. Zheng, G. A. Cheng & X. J. Li

  2. Department of Materials Science and Engineering, Beijing University of Aeronautics & Astronautics, Beijing, 100083, China

    G. X. CAO, L. F. Fu, Y. G. Zhang & C. Q. Chen

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  1. R. T. Zheng
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  2. G. A. Cheng
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  3. X. J. Li
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  4. G. X. CAO
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  5. L. F. Fu
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  6. Y. G. Zhang
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Correspondence to R. T. Zheng.

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Zheng, R.T., Cheng, G.A., Li, X.J. et al. The relationship between fracture toughness and microstructure of fully lamellar TiAl alloy. J Mater Sci 42, 1251–1260 (2007). https://doi.org/10.1007/s10853-006-1382-z

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  • DOI: https://doi.org/10.1007/s10853-006-1382-z

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