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Deformation behavior of a β-solidifying TiAl alloy within β phase field and its effect on the β→α transformation

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Han,  Fengbo
Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Chen, Y., Cheng, L., Yang, G., Lu, Y., & Han, F. (2018). Deformation behavior of a β-solidifying TiAl alloy within β phase field and its effect on the β→α transformation. Metals, 8(8): 605. doi:10.3390/met8080605.


Cite as: http://hdl.handle.net/21.11116/0000-0002-1B04-C
Abstract
In this study, the deformation behavior of a Ti-40Al-10V (at.) alloy within β single phase field was examined by means of isothermal compression at 1300◦C under strain rates of 2 s−1, 0.2 s−1, and 0.02 s−1, as well as its effect on the subsequent β→α transformation. The results showed that the alloy behaved steady-state flow with dislocation creep as the predominant rate-controlling process. Dynamic recrystallization (DRX) evidently occurred during deformation, and its volume fraction was dramatically increased so that at the lowest strain rate (0.02 s−1), a full-DRX β structure was obtained. The preferentially dynamic migration of grain boundaries with lt;100gt; orientation was demonstrated to be the major DRX mechanism. The texture was characterized by a lt;100gt; + lt;111gt; double-fiber at 2 s−1, but gradually transformed into a simple rotated cube orientationunder 0.02 s−1, accompanied by a decreasing texture intensity. During the subsequent β→α transformation, two types of α morphology wereproduced with evident variant selection, namely, the Widmannstatten colony and martensitic laths. Texture simulation revealed that the α texture was solely determined by parent β texture, despite of the variant selections. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.