Deformation and Fracture Analysis of a Duplex γ-TiAl Alloy during Low Cycle Fatigue

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Isothermal low cycle fatigue (LCF) behaviours of a third generation titanium aluminide based γ-TiAl alloy with duplex microstructure were investigated under the various test conditions, including temperature (550°C-750°C), total strain amplitude (0.3%-0.6%) and environment (air and vacuum), in order to clarify the fatigue life, deformation characters and fracture process of the alloy during LCF. The plastic strain accumulation has a great contribution to LCF damage. With increasing total strain range, LCF life decreases distinctly. Under the small total strain amplitude (≤0.4%), the increase of test temperature enforces microstructure resistance to LCF fracture. However, the increase of test temperature together with large total strain amplitude (>0.5%) accelerates the microstructural degradation, which behaves the dissolution of α2 lamellae and recrystallization of γ phase, resulting in great LCF damage. Moreover, environment brittlement during high temperature exposure to air influences the initiation process of fatigue cracks. The fracture mechanisms at various test conditions were analyzed.

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Periodical:

Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran

Pages:

1571-1576

Citation:

W. F. Cui et al., "Deformation and Fracture Analysis of a Duplex γ-TiAl Alloy during Low Cycle Fatigue", Materials Science Forum, Vols. 539-543, pp. 1571-1576, 2007

Online since:

March 2007

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$38.00

[1] F. Appel, R. Wagner: Intermetallics Vol. 8 (2000), p.1283.

[2] C. Mabru, D. Bertheau and S. Pautrot: Engineering Fracture Mechanics Vol. 64 (1999), p.23.

[3] C. Mercer, J. Lou and W.O. Soboyejo: Mater. Sci. Eng. A Vol. 284 (2000), p.235.

[4] J. Lou, C. Mercer and W.O. Soboyejo: Mater Sci Eng A Vol. 319-321 (2001), p.618.

[5] R. Gnanamoorthy, Y. Mutoh and Y. Mizuhara: Intermetallics Vol. 4 (1996), p.525.

[6] H. -J. Christ, F.O.R. Fischer and H.J. Maier: Mater. Sci. Eng. A Vol. 319-321 (2001), p.625.

[7] V. Recina, B. Karlsson: Mater. Sci. Eng. A Vol. 262 (1999), p.70.

[8] V. Recina: Mater. Sci. Techn. Vol. 16 (2000), p.333.

[9] P. Pouly, M.J. Hua, C.I. Garcia and A.J. Deardo: Scripta Mater. Vol. 29 (1993), p.1529.

[10] M. Beschliesser, A. Chatterjee and A. Lorich: Mater. Sci. Eng. Vol. 329-331 (2002), p.124.

[11] J.G. Wang, L.M. Hsiung and T.G. Nieh: Intermetallics Vol. 7 (1999), p.757.

[12] C. Mabru, G. Henaff and J. Petit: Intermetallics Vol. 5 (1997), p.355.

[13] A.H. Rosenberger: Scripta Mater. Vol. 44 (2001), p.2653.

[14] C.T. Liu: Scripta Mater. Vol. 27 (1992), p.599.

[15] M. Yoshioka, A. Ueno and H. Kishimoto: Intermetallics Vol. 12 (2004), p.23.

[16] S. Lesterin, C. Sarrazin, J. Petit: Proc. of the 9th Inter. Conf. on Fatigue (Sidney 1997), p.36.

[17] P.F. Browning: Superalloys 718, 625, 706 and various derivatives (The Minerals, Metals and Materials Society 1997).

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