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Hot deformation and softening response in boron-modified two-phase titanium aluminide Ti–48Al–2V–0.2B

Published online by Cambridge University Press:  19 October 2020

Nitish Bibhanshu Open the ORCID record for Nitish Bibhanshu [Opens in a new window] ,
Gyan Shankar  and
Satyam Suwas
Nitish Bibhanshu*
Affiliation:
Department of Materials Engineering, Indian Institute of Science Bangalore, Bangalore 560012, India
Gyan Shankar
Affiliation:
Department of Materials Engineering, Indian Institute of Science Bangalore, Bangalore 560012, India
Satyam Suwas*
Affiliation:
Department of Materials Engineering, Indian Institute of Science Bangalore, Bangalore 560012, India
*
a)Address all correspondence to these authors. e-mail: nitishb@iisc.ac.in, nitishbibhanshu@gmail.com
b)e-mail: satyamsuwas@iisc.ac.in
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Abstract

Hot deformation and softening response for the titanium aluminide Ti–48Al–2V–0.2B has been investigated. The deformation response to softening mechanisms has been examined. Deformation experiments were carried out in the strain rate range 0.01–10 s−1 keeping the temperature constant at 1200 °C and in the temperature range 1000–1200 °C at the strain rate 1 s−1. With an increase in strain rate, the microstructural changes associated with the softening mechanism include breaking of the lamellae, spheroidization of the broken laths and dynamic recrystallization. For the strain rate 1 s−1, deformation in the (α2 +γ) phase field leads to fine recrystallized grains, remnant lamellae and cavitation along the grain boundaries (for temperatures 1000 and 1100 °C). Deformation in the (α +γ) phase field leads to dynamic recrystallization at the shear bands, within the lamellae, breaking and rotation of the α phase during the continuous increase in the deformation strain.

Keywords

microstructurescanning electron microscopy (SEM)thermogravimetric analysis (TGA)

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Journal of Materials Research , First View , pp. 1 - 11
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Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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Footnotes

†

Current Address: Reactor & Nuclear Systems Division, Oak Ridge National Laboratory, Oak Ridge, TN - 37831, US

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