Texture Formation during Hot-Deformation of High-Nb Containing γ-TiAl Based Alloys

Abstract:

In this study texture and microstructure formation in high-Nb containing TiAl alloys during lab-scale compression experiments and “near conventional” forging on an industrial scale are investigated. The deformation temperatures range from 700 °C up to temperatures close to the α transus temperature (Tα = 1295 °C). Depending on the deformation conditions, the texture of the tetragonal γ-TiAl phase is formed by pure deformation components, components related to dynamic recrystallization, or transformation components. This changing corresponds with microstructural observations. The hexagonal phases α2-Ti3Al and α-Ti(Al) show a similar texture as it is known for Ti and Ti-base alloys after compressive deformation at elevated temperatures. In contrast to the γ texture, no significant change of the α/α2 texture was observed in the investigated temperature range. In the alloy with a composition of Ti-45Al-10Nb (in at.%) even deformation textures of ternary intermetallic phases, as the hexagonal ωo-Ti4Al3Nb and the cubic βo-TiAl(Nb) phase, respectively, were measured and analyzed.

• Periodical: Solid State Phenomena (Volume 160)
• Pages: 301-306
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.160.301
• Online since: February 2010
• Authors: A. Stark, Frank Peter Schimansky, Helmut Clemens
• Keywords: Forging, Intermetallic, Microstructure, Texture, TiAl

References

[1] H. Kestler and H. Clemens, in: Titanium and Titanium Alloys, edited by C. Leyens and M. Peters, Wiley-VCH, Weinheim, Germany (2003), p.351.

[2] F. Appel, M. Oehring, J. D. H. Paul and U. Lorenz, in: Structural Intermetallics 2001, edited by K. Hemker, D. Dimiduk, H. Clemens, R. Darolia, H. Inui, J. Larsen, V. Sikka, M. Thomas and J. Whittenberger, TMS, Warrendale, PA, USA (2001), p.63.

[3] S. Bystrzanowski, A. Bartels, H. Clemens, R. Gerling, F. -P. Schimansky, G. Dehm and H. Kestler: Intermetallics Vol. 13 (2005), p.515.

DOI: 10.1016/j.intermet.2004.09.001

[4] R. Gerling, F. -P. Schimansky, A. Stark, A. Bartels, H. Kestler, L. Cha, C. Scheu and H. Clemens: Intermetallics Vol. 16 (2008), p.689.

DOI: 10.1016/j.intermet.2008.02.004

[5] S. Kremmer, H. F. Chladil, H. Clemens and A. Otto, in: Ti-2007 Science and Technology, edited by M. Niinomi, S. Akiyama, M. Hagiwari, M. Ikeda, K. Maruyama, The Japan Institute of Technology, Japan, (2008), p.989.

[6] W. Skrotzki, R. Tamm, H. G. Brokmeier, M. Oehring, F. Appel and H. Clemens: Materials Science Forum Vol. 408-412 (2002), p.1777.

DOI: 10.4028/www.scientific.net/msf.408-412.1777

[7] H. Brokmeier, M. Oehring, U. Lorenz, H. Clemens and F. Appel: Metallurgical and Materials Transactions A Vol. 35 (2004), p.3563.

[8] A. Stark, A. Bartels, R. Gerling, F. -P. Schimansky and H. Clemens: Advanced Engineering Materials Vol. 8 (2006), p.1087.

[9] A. Stark, A. Bartels, H. Clemens, S. Kremmer, F. -P. Schimansky and R. Gerling: Advanced Engineering Materials (2009), accepted for print.

[10] L. Bendersky, W. Boettinger, B. Burton, F. Biancaniello and C. Shoemaker: Acta Metallurgica et Materialia Vol. 38 (1990), p.931.

DOI: 10.1016/0956-7151(90)90165-d

[11] A. Stark, A. Bartels, H. Clemens and F. -P. Schimansky: Advanced Engineering Materials Vol. 10 (2008), p.929.

[12] M. Dahms and H. J. Bunge: Journal of Applied Crystallography Vol. 22 (1989), p.439.

[13] H. Wenk, S. Matthies, J. Donovan and D. Chateigner: Journal of Applied Crystallography Vol. 31 (1998), p.262.

[14] H. Mecking, C. Hartig and U. Kocks: Acta Materialia Vol. 44 (1996), p.1309.

[15] W. Schillinger, A. Bartels, R. Gerling, F. -P. Schimansky and H. Clemens: Intermetallics Vol. 14 (2006), p.336.

[16] A. Bartels and W. Schillinger: Intermetallics Vol. 9 (2001), p.883.

[17] F. Appel and R. Wagner: Materials Science and Engineering R Vol. 22 (1998), p.187.

[18] G. Wassermann and J. Grewen: Texturen metallischer Werkstoffe. Springer, Berlin, (1962).

DOI: 10.1007/978-3-662-13128-2

[19] M. A. Morris and Y. G. Li: in Gamma Titanium Aluminides, edited by Y. -W. Kim, R. Wagner and M. Yamaguchi, TMS, Warrendale, PA, USA (1995), p.353.