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The fracture behaviour of intermetallic TiAl alloys with and without warm pre-stressing

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Abstract

The fracture behaviour of near-γ (NG) and fully lamellar (DFL) intermetallic TiAl alloys with and without warm pre-stressing (WPS) is investigated by testing three point bending specimens with fatigue pre-cracks at room temperature and at 700 °C. Detailed fractographic observations and FEM calculations are carried out to find the critical step of cleavage fracture. The results show that the cleavage fracture is induced by direct propagation of the pre-crack and that the stress at the crack tip is the decisive controlling factor. The WPS process improves the fracture initiation toughness of both the NG and the DFL microstructure, but deteriorates slightly the increase of the K-resistance curves, especially for the DFL microstructure. The compressive residual stress induced by WPS plays the main role in improving the fracture initiation toughness.

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Author notes

  1. J.H. Chen (Visiting Professor, permanent address)

    Present address: Gansu University of Technology, Lanzhou, Gansu, 730050, P.R. China

Authors and Affiliations

  1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences and Institute of Metal Physics, University of Leoben, A-8700, Leoben, Austria

    J.H. Chen (Visiting Professor, permanent address), R. Pippan, T. Hebesberger & O. Kolednik

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  1. J.H. Chen
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  2. R. Pippan
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  3. T. Hebesberger
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  4. O. Kolednik
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Chen, J., Pippan, R., Hebesberger, T. et al. The fracture behaviour of intermetallic TiAl alloys with and without warm pre-stressing. International Journal of Fracture 113, 327–343 (2002). https://doi.org/10.1023/A:1014277323105

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