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Mechanism of shear band formation and dynamic softening in a two-phase (α2 + γ) titanium aluminide

Published online by Cambridge University Press:  02 June 2020

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

The formation of shear bands during hot deformation of a two-phase (α2 + γ) titanium aluminide and its consequences on dynamics softening has been investigated. The starting material consists of a colony of lamellar grains along with the segregated vanadium and niobium which was subjected to hot deformation in the temperature range 1000–1175 °C at the strain rate 10 s−1. Microstructures of the deformed samples indicate that, with increase in the deformation temperature, the orientation of shear bands changes. Moreover, the extent of dynamic recrystallization also increases with deformation temperature. The softening behaviour and crystallographic orientation change within lamellae during hot deformation have been explored. The nucleation of newly recrystallized grains has been observed at twin–parent grain boundary and within the twined γ phase. Lamellae of the γ and α2 phase have been also observed to be twisted and tilted, leading to the band formations under the load, whose mechanisms have also been explored in the present study.

Keywords

scanning electron microscopytextureannealing
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 13: Focus Section: Interactions of Shear Transformation Bands , 14 July 2020 , pp. 1635 - 1646
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Copyright © Materials Research Society 2020

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