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Hot deformation behavior and microstructure evolution of a high-temperature titanium alloy modified by erbium

Published online by Cambridge University Press:  16 February 2017

Tongbo Wang
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
Bolong Li*
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
Zhenqiang Wang
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
Zuoren Nie*
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
*
a) Address all correspondence to these authors. e-mail: blli@bjut.edu.cn
b) e-mail: zrnie@bjut.edu.cn
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Abstract

Isothermal compression testing of Ti–5.8Al–3Sn–5Zr–0.5Mo–1.0Nb–1.0Ta–0.4Si–0.2Er titanium alloy is performed on a Gleeble-3500 thermal simulator, and the corresponding microstructures are analyzed to clarify the softening mechanism and participates evolution. A constitutive equation compensated by strain has been established to describe the hot deformation behavior of the alloy. The deformation activation energies are calculated to be 369760.93–699310.86 J/mol in α + β two-phase region and 268030.03–325800.41 J/mol in β single-phase region. At a temperature of 880 °C, the main softening mechanism is the continuous dynamic recrystallization of lamellar α colony, controlled by the mechanical rotation of the sub-grain followed by dislocation climbing and annihilation by diffusion. Meanwhile, the dominant softening mechanism is the discontinuous dynamic recrystallization of β phase during the deformation at temperatures of 920 °C–1080 °C. Silicide containing Er with an average diameter of 20 nm is formed during the water quenching.

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Articles
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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