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Submicrocrystalline Structure Formation in Ti and Ti-64 Alloy by Warm “abc” Deformation

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Abstract:

Mechanical behavior and microstructure evolution of Ti and Ti-64 titanium alloy during warm “abc” deformation has been studied. The “abc” deformation was consisted of successive compression of a sample along three orthogonal directions. Mechanical behavior of each material was described by set of successive σ-ε curves combined into cumulative σ-Σε curve. Microstructure of Ti was found to be refined to a grain size of about 0.4 μm due to formation of deformation-induced boundaries within initial grains. Although a stage like steady state flow was observed at the cumulative σ-Σε curve such mechanical behavior was hardly associated with superplastic flow. In two-phase Ti-64 alloy the structure was found to be refined to a grain size of about 0.4 μm after warm “abc” deformation due to globularization α- and β-particles following breaking down of α-lamellar and β- layers. Microstructure refinement of the alloy was associated with softening and superplastic flow.

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Periodical:

Materials Science Forum (Volumes 551-552)

Pages:

183-188

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.551-552.183

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Online since:

July 2007

Authors:

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

Keywords:

'abc' Deformation, Microstructural Refinement, Superplastic Flow, TiAl, Titanium (Ti)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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