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Effect of strain rate in severe plastic deformation on microstructure refinement and stored energies

Published online by Cambridge University Press:  11 January 2011

Shashank Shekhar ,
Jiazhao Cai ,
Saurabh Basu ,
Sepideh Abolghasem  and
M. Ravi Shankar
Shashank Shekhar
Affiliation:
School of Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
Jiazhao Cai
Affiliation:
School of Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
Saurabh Basu
Affiliation:
School of Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
Sepideh Abolghasem
Affiliation:
School of Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
M. Ravi Shankar*
Affiliation:
School of Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The interplay of large strain and large strain rate during high-rate severe plastic deformation (HR-SPD) lead to dynamic temperature rise in situ that engenders a recovered microstructure whose characteristics are not just a function of the strain, but also of the strain rate and the coupled temperature rise during the deformation. In this work, we identify three classes of microstructures characterized by multistage recovery phenomena that take place during the high strain rate SPD of Cu. It is found that the first stage of this recovery is similar to the first stage of static recovery, which is characterized mainly by annihilation of dislocations. The second stage starts around 360 K and was characterized by dislocations getting arranged in tight cell boundaries and eventually into subgrain. Recovery stages were found to be followed by a stage of grain growth and recrystallization when the temperature in the deformation zone approaches 480 K.

Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 3 , 14 February 2011 , pp. 395 - 406
Copyright
Copyright © Materials Research Society 2011

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