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

Bibhanshu, N and Suwas, S (2020) Mechanism of shear band formation and dynamic softening in a two-phase (α2 + γ) titanium aluminide. In: Journal of Materials Research, 35 (13). pp. 1635-1646.

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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 γphase. Lamellae of the γand 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. © 2020 Cambridge University Press. All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Materials Research
Publisher:	Cambridge University Press
Additional Information:	Copy right for this article belongs to Cambridge University Press
Keywords:	Deformation; Dynamic recrystallization; Grain boundaries; Shear bands; Strain rate; Titanium, Crystallographic orientations; Deformation temperatures; Deformed samples; Dynamic softening; Recrystallized grains; Shear band formation; Temperature range; Titanium aluminides, Dynamics
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Jan 2021 11:01
Last Modified:	01 Jan 2021 11:01
URI:	http://eprints.iisc.ac.in/id/eprint/65758

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