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Microstructure and Texture Evolution during Continuous Dynamic Recrystallization at Warm Deformation of Titanium

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Abstract:

The microstructure and texture evolutions in pure titanium during severe plastic deformation at T=400°C were investigated. Compressive deformation of prismatic samples was sequentially applied in three orthogonal directions up to 12 steps and a strain at each step of 40%. A radical microstructure refinement (from 20 to 0.2 µm) during strain has been found. The features of the deformation structure are a high level of internal stresses, high density of dislocations, a large number of deformation induced boundaries and the presence of twins. It is shown that during strain there is a significant change in disorientation angles and axes of individual high angle grain boundaries. At the same time the total set of high angle boundaries - Misorientation Distribution Function (MDF) and texture - does not change significantly with strain. The reasons for the change in disorientation angles and axes at new deformation-induced boundaries during plastic flow are discussed.

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Periodical:

Materials Science Forum (Volumes 467-470)

Pages:

1211-1216

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.467-470.1211

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Online since:

October 2004

Authors:

S.Yu. Mironov, Gennady A. Salishchev, Sergey V. Zherebtsov

Keywords:

Deformation Induced Boundaries, Low Temperature Continuous Dynamic Recrystallization, Misorientation Distribution Function, Titanium (Ti)

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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