Processing of Intermetallic Titanium Aluminide Wires

Metals

Tom Marr¹  Jens Freudenberger¹  Alexander Kauffmann¹  Jan Romberg¹  Ilya Okulov¹  Romy Petters¹  Juliane Scharnweber²  Andy Eschke²  Carl-Georg Oertel²  Uta Kühn¹  Jürgen Eckert¹  Werner Skrotzki² 

[1] IFW Dresden, Helmholtzstraï¿œe 20, 01069 Dresden, Germany; E-Mails:;TU Dresden, Institut für Strukturphysik, 01062 Dresden, Germany; E-Mails:

关键词: Ti;    Al;    titanium aluminide;    wire;    phase reaction;   

DOI  :  10.3390/met3020188

来源: mdpi

【 摘 要 】

This study shows the possibility of processing titanium aluminide wires by cold deformation and annealing. An accumulative swaging and bundling technique is used to co-deform Ti and Al. Subsequently, a two step heat treatment is applied to form the desired intermetallics, which strongly depends on the ratio of Ti and Al in the final composite and therefore on the geometry of the starting composite. In a first step, the whole amount of Al is transformed to TiAl₃ by Al diffusion into Ti. This involves the formation of 12% porosity. In a second step, the complete microstructure is transformed into the equilibrium state of γ-TiAl and TiAl₃. Using this approach, it is possible to obtain various kinds of gradient materials, since there is an intrinsic concentration gradient installed due to the swaging and bundling technique, but the processing of pure γ-TiAl wires is possible as well.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland