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Formation mechanism of the high-speed deformation characteristic microstructure based on dislocation slipping and twinning in α-titanium

Published online by Cambridge University Press:  21 November 2016

Tongbo Wang ,
Bolong Li ,
Zhenqiang Wang  and
Zuoren Nie
Tongbo Wang
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
Bolong Li*
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
Zhenqiang Wang
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
Zuoren Nie*
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China
*
a) Address all correspondence to these authors. e-mail: [email protected]
b) e-mail: [email protected]
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Abstract

As-annealed commercial pure titanium (grade 1) was selected as a model material whose crystalline structure was hexagonal close-packed. The evolution of the microstructure and micro-orientation induced by high-speed compression was characterized to elaborate the formation mechanism of the high-speed deformation characteristic microstructure in α-titanium. Twinning played a coordinating role for dislocation slipping that was the main plastic deformation mechanism. The high-speed deformation characteristic microstructure of as-annealed commercial pure titanium was an adiabatic shear band (ASB) with an average width of 50 μm at a strain rate of 5400 s−1, whose initial grains were 0.5–1.0 μm in size. The formation and extension of ASB were attributed to the interaction between the shear stress and the adiabatic temperature rise. A formation model of ASB in α-Ti was proposed in terms of the formation mechanism of the high-speed deformation characteristic microstructure.

Keywords

commercial pure titaniumadiabatic shear banddislocation slippingtwinning
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 24 , 28 December 2016 , pp. 3907 - 3918
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Copyright
Copyright © Materials Research Society 2016 

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