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

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 def...

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Bibliographic Details
Published inJournal of materials research Vol. 35; no. 13; pp. 1635 - 1646
Main Authors Bibhanshu, Nitish, Suwas, Satyam
Format Journal Article
LanguageEnglish
Published New York, USA Cambridge University Press 14.07.2020
Springer International Publishing
Springer Nature B.V
Subjects
Alloys
Applied and Technical Physics
Biomaterials
Crystallography
Deformation
Dynamic recrystallization
Edge dislocations
Gamma phase
Grain boundaries
Inorganic Chemistry
Intermetallic compounds
Materials Engineering
Materials research
Materials Science
Microstructure
Nanotechnology
Niobium
Nucleation
Scanning electron microscopy
Shear bands
Softening
Solidification
Strain hardening
Strain rate
Symmetry
Temperature
Titanium
Titanium aluminides
Titanium base alloys
scanning electron microscopy
annealing
texture
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Summary: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.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2020.99