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In situ measurement of deformation mechanics and its spatio-temporal scaling behavior in equal channel angular pressing

Published online by Cambridge University Press:  31 March 2015

Marzyeh Moradi ,
Saurabh Basu  and
Meenakshisundaram Ravi Shankar
Marzyeh Moradi
Affiliation:
Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
Saurabh Basu
Affiliation:
Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
Meenakshisundaram Ravi Shankar*
Affiliation:
Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Deformation mechanics in equal channel angular pressing (ECAP) was studied in situ using digital image correlation (DIC) and infra-red (IR) thermography. In a prototypical experiment in an optical and IR transparent die, the deformation of commercially pure lead (Pb) is observed using high-speed optical and IR cameras. From the resulting time-sequence images of metal-flow in the deformation zone, DIC is used to characterize the zone of severe plastic deformation (SPD) as a function of the scale of deformation (sample dimensions), deformation speed, and die geometry. The temperature rise in the deformation zone was characterized using IR thermography and the results were compared against theoretical estimates. These observations provide direct insights into the mechanics of SPD in ECAP, which can offer strategies for microstructure control, process optimization, and miniaturization of ECAP.

Keywords

equal channel angular pressingdeformation mechanicsdigital image correlation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 6 , 28 March 2015 , pp. 798 - 810
Copyright
Copyright © Materials Research Society 2015 

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