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1. E-beam patterning

(b). (a). CAREER: Experimental Investigation of Plasticity at Nano-scale Julia R. Greer, California Institute of Technology, DMR 0748267. 1. E-beam patterning. 2. Electroplating.

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1. E-beam patterning

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  1. (b) (a) CAREER: Experimental Investigation of Plasticity at Nano-scale Julia R. Greer, California Institute of Technology, DMR 0748267 1. E-beam patterning 2. Electroplating Motivation: Mechanical properties of materials are different when sample dimensions are reduced to nano-scale. Conducting in-situ experiments at that scale is challenging yet necessary to understand true deformation mechanisms and to develop new materials. • Key Accomplishments: • 1. Developed FIB-less nano-pillar fabrication methodology • 2. Uniaxial compression and tension experiments reveal: • Smaller is Stronger for fcc and bcc metals • Smaller is Weaker for nanocrystalline metals • Smaller is Stronger and more Ductile for metallic glasses • Tension-compression asymmetry and strain rate sensitivity in bcc nano-pillars • Cu nano-pillars are strain rate sensitive below 150nm implying surface dislocation nucleation 20 nm (d) (e) (c) 4. Free-standing pillar array 3. Pillars in PMMA matrix Figure 1. (a) Fabrication steps: E-beam lithography/electroplating. (b) TEM image of nano-twinned Cu pillar w periodic <111> twin boundaries (diffraction pattern in inset) (c ) ion image of Cu nano-pillar with some twin boundaries (d) 100nm single crystalline Cu nano-pillar for tensile testing (e) pillar array for testing (circles etched as markers post-fabrication)

  2. CAREER: Experimental Investigation of Plasticity at Nano-scale Julia R. Greer, California Institute of Technology, DMR 0748267 BROAD IMPACT PI is faculty advisor for Society of Women Engineers (SWE) and Women Mentoring Women UNDERGRADUATE STUDENTS Troy Sandberg (Caltech SURF) Cameron Gross (Caltech SURF) Sun Lin (Natl U of Signapour) Yeojun Chun (Caltech SURF) Warren Cai (Caltech SURF) Ana Fernandez (SURF) HIGH SCHOOL STUDENTS Nancy Fann, Jaya Chandra GRADUATE STUDENTS Shelby Hutchens (5th year) Andrew Jennings (3rd year) Allison Kunz* (2nd year) Clara Cho (2nd year) Joanna Kolodziejska (1st year) Zach Aitken (1st year) POST-DOCS Ju-Young Kim (Ph.D. SNU) Mingyuan Huang (Ph.D. Columbia U.) Dongchan Jang (PhD. U Mich.) • RELEVANT PUBLICATIONS (2009-2010): • Kaul, K.G. et al Nanotechnology21, 315501 (2010). • A.T. Jennings, et al Phys Rev Lett,104, 135503 (2010). • D. Jang, J.R. Greer Nature Materials,9, 215-219 (2010). • G. Lee, et al, Acta Materialia, 58 (4) 1361-1368 (2010). • J.-Y. Kim, et al, Acta Materialia 58 (2010) 2355-2363. • M. J. Burek, J. R. Greer Nano Letters, 10, 69-76 (2009). • J.R. Greer, et al, J of Materials 61 (12) 19-25 (2009). • J.R. Greer, et al Adv. Func. Materials 19, 2880-6 (2009) SEMINARS (2009-2010): UC Berkeley, Yale, Sandia NL, UC Riverside, Trinity College (Ireland) (2010), USC, Johns Hopkins U, USC ,MIT, U Michigan, Notre Dame CONFERENCES (2009-10): MRS, TMS, GRC, ASME, ECI, EIPBN (3-beam), Plasticity 2010, Several “Micromechanics” and “Nano-materials” workshops

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