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Fall 2008 MRS presentation (Boston)
1. Heterogeneous deformation and dislocation dynamics in Cu single crystal micropillars under compression Sreekanth Akarapu, Hussein Zbib and David Bahr The support from the Division of Materials Science and Engineering, Office of Basic Energy Science at the DOE under grant number DE-FG02-07ER46435 is gratefully acknowledged.
9. Dislocation burst: Dislocation mechanisms Spiral Source A B B B C E G G D G D F A B A’ B’ Pinned Traction free boundary Traction free boundary A C B
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11. Hardening: Dislocation Configurations Effective Mean Free Path is reduced Increase in stress to mobilize (111) A B B B C D q p s r s q Pinned Traction free Pinned
12. Deformed Contour plots % Effective Plastic Strain σ zz Magnified 10 times A B C D E F Pinned Stress concentration due to ledge at the surface
13. Effect of boundary conditions With friction between indenter and the specimen top surface Without friction between indenter and the specimen top surface The thickness of the specimen is 0.5 microns Double slip deformation