Journal of Materials Science

, Volume 42, Issue 8, pp 2820–2829 | Cite as

Fracture behavior of notched specimens of TiAl alloys

  • J. H. ChenEmail author
  • R. Cao
  • J. Zhang
  • G. Z. Wang


Fracture behavior of a two-phase TiAl alloy was investigated using notched specimens. Fracture surfaces and metallographic sections of surviving notch in double notched specimens are observed. The fracture process of notched specimens of TiAl alloys was described as that several inter-lamellar cracks initiate and extend directly from the notch root and propagate preferentially along the interfaces between lamellae and stop at various obstacles. With increasing applied load, cracks connect with each other and propagate further by translamellar cracks. The toughening mechanisms, which make the main crack difficult to propagate or cause it to be stopped, could be reducing the driving force for crack propagation. The higher toughness of near fully lamellar microstructure than that of finer duplex microstructure is attributed to the path of crack propagation. On the fracture surfaces of the finer duplex microstructure, more low-energy-spending interlamellar fracture facets are observed, which means that it is easier for crack to bypass a fine duplex lamellar grain with lamellae perpendicular to the main crack and to take a interlamellar path.


Main Crack Notch Root TiAl Alloy Lamellar Microstructure Cleavage Crack 
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This work was financially supported by the National Natural Science Foundation of China (No. 50471109), the National Natural Science Foundation of Gansu Province (No. 3ZS061-A25-037) and Opening Foundation of State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials.


  1. 1.
    Kim YW (1989) JOM 41(7):24CrossRefGoogle Scholar
  2. 2.
    Kim YW (1991) JOM 43(8):40CrossRefGoogle Scholar
  3. 3.
    Yamaguchi M, Inui H (1993) Structural intermetallics, TMS, Pittsburgh, PA, p 127Google Scholar
  4. 4.
    Kim YW (1994) JOM 46(7):30CrossRefGoogle Scholar
  5. 5.
    Chen JH, Pippan R, Hebesberger T (2002) Int J Fracture 113:327CrossRefGoogle Scholar
  6. 6.
    Chan KS, Kim YW (1992) Metall Trans A 30A:1663CrossRefGoogle Scholar
  7. 7.
    Lu YH, Zhang YG, Chen CQ (1999) Gamma titanium aluminides, edited by Kim Y-W, Dimiduk DM, Loretto MH, Minerals, Metals and Materials Society, 595Google Scholar
  8. 8.
    Chan KS, Onstott J, Kumar KS (2000) Metall Trans A 31A:71CrossRefGoogle Scholar
  9. 9.
    Arata JJM, Kumar KS, Curtin WA, Needleman A (2001) Int J Fracture 111:163CrossRefGoogle Scholar
  10. 10.
    Chan KS (1993) Metall Trans A 24A:569CrossRefGoogle Scholar
  11. 11.
    Kim YW, Dimiduk DM (1997) George Irwin R. Symposium on Cleavage Fracture, edited by Chan KS, The Minerals, Metals and Materials Society, 305Google Scholar
  12. 12.
    Inui H, Oh MH, Nakamura A, Yamaguchi M (1992) Acta Metall Mater 40:3095CrossRefGoogle Scholar
  13. 13.
    Wang P, Bhate N, Chan KS, Kumar KS (2003) Acta Metall Mater 51:1573CrossRefGoogle Scholar
  14. 14.
    Guo FA, Ji V, Francois M, Zhang YG (2003) Acta Mater 51:5349CrossRefGoogle Scholar
  15. 15.
    Chen JH, Cao R, Wang GZ, Zhang J (2004) Metall Mater Trans A 35A:439CrossRefGoogle Scholar
  16. 16.
    Chen JH, Wang Q, Wang GZ, Li Z (2003) Acta Mater 51:1841CrossRefGoogle Scholar
  17. 17.
    Chen JH, Cao R, Zhang J, Wang GZ (2005) Mater Sci Technol 21(5):507CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.State Key Laboratory of Gansu Advanced Non-ferrous Metal MaterialsLanzhou University of TechnologyLanzhouChina
  2. 2.High Temperature Material Research DivisionCentral Iron and Steel Research InstituteBeijingChina

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