Fracture Behavior of Directional TiAl Lamellar Structures

Ji Zhang

doi:10.4028/www.scientific.net/KEM.488-489.634

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Dynamic J-Integral Evaluation of Three-Point-Bend Beams with Various Geometrical Dimensions
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 488-489Fracture Behavior of Directional TiAl Lamellar...

Fracture Behavior of Directional TiAl Lamellar Structures

Abstract:

In order to assess the influences of macro- and microstructure as well as the cast flaw on the tensile properties, the fracture behavior of a number of ambient tensile TiAl specimens containing directional lamellar microstructure have been analyzed. It is found that all the fractures of tensile specimens are triggered by a critical Griffith crack. According to the desirable ambient tensile properties coincide with the initial cracking facets smaller than 600 mm, it is proposed that the detrimental effect of the random oriented lamellar colonies on the tensile properties can be eliminated through cast technology improvement.

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Periodical:

Key Engineering Materials (Volumes 488-489)

Pages:

634-637

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.488-489.634

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Online since:

September 2011

Authors:

Ji Zhang

Keywords:

Directional Lamellar Structures, Fracture Behavior, Tensile Test, TiAl Alloys

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