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Effect of Length Scales on Microstructure Evolution During Severe Shear Deformation

[+] Author Affiliations
Saurabh Basu, M. Ravi Shankar

University of Pittsburgh, Pittsburgh, PA

Paper No. MSEC2014-4174, pp. V001T01A010; 8 pages
doi:10.1115/MSEC2014-4174
From:
  • ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference
  • Volume 1: Materials; Micro and Nano Technologies; Properties, Applications and Systems; Sustainable Manufacturing
  • Detroit, Michigan, USA, June 9–13, 2014
  • Conference Sponsors: Manufacturing Engineering Division
  • ISBN: 978-0-7918-4580-6
  • Copyright © 2014 by ASME

abstract

Effect of length scales on microstructure evolution during Severe Plastic Deformation (SPD) was studied using orthogonal machining as a test of microstructure response. Machining was performed on Ni-200 in the plane strain configuration inside the chamber of a scanning electron microscope. Mechanics of material flow in the deformation zone was characterized in-situ using Digital Image Correlation. Post-mortem Orientation Image Mapping was performed using Electron Back Scattered Diffraction on partially detached chip specimens. Length scales were varied by setting depths of cut between 10-1 μm. It was found that with shrinking length scales, the continuous evolution of microstructure induced by SPD is replaced by abrupt but sporadic refinement mechanisms. By machining pre-strained samples, it was seen that this switchover is further instigated by initial defect concentrations.

Copyright © 2014 by ASME

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