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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
Article

Abstract

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.

Keywords

Main Crack Notch Root TiAl Alloy Lamellar Microstructure Cleavage Crack 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

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.

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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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