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Shear band widening mechanism in Ti–6Al–4V under high strain rate deformation

Published online by Cambridge University Press:  12 March 2020

Anuj Bisht ,
Subhash Kumar ,
Ka Ho Pang ,
Rongxin Zhou ,
Anish Roy ,
Vadim V. Silberschmidt  and
Satyam Suwas
Anuj Bisht*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Subhash Kumar
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Ka Ho Pang
Affiliation:
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, U.K.
Rongxin Zhou
Affiliation:
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, U.K.
Anish Roy
Affiliation:
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, U.K.
Vadim V. Silberschmidt
Affiliation:
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, U.K.
Satyam Suwas
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
a)Address all correspondence to this author. e-mail: toninegi01@gmail.com
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Abstract

In this study, mechanical properties and microstructural investigation of Ti64 at high strain rate are studied using a split-Hopkinson pressure bar method under compression for temperatures up to 800 °C. Flow softening in the mechanical response of material to such loading conditions hints at instability in compression, which increases with an increase in temperature. Microstructural characterization of the deformed material is characterized using the electron-backscattered diffraction technique. It reveals the presence of instabilities in Ti64 in the form of a fine network of shear bands. The shear band width grows with an increase in temperature along with the area fraction of shear band in the material, displaying its improved capacity to contain microstructural instabilities at higher temperature. After a detailed microstructural investigation, a mechanism for shear band widening is proposed. Based on this mechanism, a path generating nuclei within shear bands is discussed.

Keywords

Tistress/strain relationshiptexture
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 13: Focus Section: Interactions of Shear Transformation Bands , 14 July 2020 , pp. 1623 - 1634
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Copyright
Copyright © Materials Research Society 2020

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