Manufacturing, Materials Processing, Grain Boundaries 

• S. Abolghasem, S. Basu, S. Shekhar , J. Cai, and M.R. Shankar, Mapping Subgrain Sizes Resulting from Severe Simple Shear Deformation, Acta Met. 60 (2012) 376-386.
• S. Shekhar , J. Cai, S. Basu, S. Abolghasem, and M.R. Shankar, Effect of Severe Plastic Deformation in Machining Elucidated via Rate-Strain-Microstructure (RSM) Mappings, (accepted for publication) Journal of Manufacturing Science and Engineering- Transactions of ASME (2012).
• S. Shekhar, J. Cai, S. Basu, S. Abolghasem, and M.R. Shankar, Effect of Strain-rate in Severe Plastic Deformation on Microstructure Refinement and Stored Energies, J. Mater. Res. 26 (2010) 395-406.
• S. Shekhar, Alexander H. King, Strain Fields and Energies of Grain Boundary Triple Junction, Acta Materialia, 56 (2008) 5728-5736.
• Alexander H. King, S. Shekhar, What Does it Mean to be Special? The Significance and Application of the Brandon Criterion, Journal of Materials Science, 41 (2006) 7625-7682.

 

Machining is known to impart very large deformation not only on the chips that come out, but also on the surface of the work-piece. Since machining allows handle over velocity as well as rake angle, one can modulate strain, strain-rate and the induced temperature during such large deformation. This leads to myriad of microstructural transformations of the chip and the surface. In our recent work we have shown that such microstructural transformation have large effect on the mechanical as well as the functional properties (corrosion and oxidation) of the material 

Structural NanomaterialsAutomotive materials and manufacturing

• Post-doc (2008-2011): University of Pittsburgh, USA

 

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Severe Plastic Deformation, Grain boundaries, triple junctions, Thermomechanical Processing, Grain boundary engineering, Machining, Surface engineering, modulation assisted machining