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Key Accomplishments:

CAREER: Experimental Investigation of Plasticity at Nano-scale Julia R. Greer, California Institute of Technology, D MR 0748267.

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Key Accomplishments:

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  1. CAREER: Experimental Investigation of Plasticity at Nano-scale Julia R. Greer, California Institute of Technology, DMR 0748267 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: • Emergence of strain rate sensitivity in sub-250nm diameter single Xtalline FIB-less Cu nano-pillars due to surface source nucleation1 • Uniaxial compression on bi-crystalline Al pillars reveal identical size effect, stochastic signature. TEM analysis reveals no dislocation storage near boundary => dislocation sink2 • Nano-twinned Cu nano-pillars are brittle for TBs orthogonal to loading direction at D = 100nm and ductile when D = 50nm or TBs are slanted Deviation from Power-Law Small Pillars & Slow Strain Rates Size effect identical to single crystalline pillars Bi-crystalline Al

  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 NSF-SUPPORTED UNDERGRADUATE STUDENTS Luis Miramontes (East LA Com. College) Amy Wat (Cal State LA) Brian Okoro(Caltech SURF) Jarvis Li (Caltech SURF) Jennifer Zhu (Caltech SURF) Jeff Han(Caltech SURF) Liz Deconvelaere (Caltech SURF) HIGH SCHOOL STUDENTS Joanne Lynne, Margarette Aguinaldo NSF-SUPORTED POST-DOCS Dongchan Jang • RELEVANT PUBLICATIONS (2010-2011): • J.R. Greer and J. Th. M. de HossonProg in Mat Sci • (invited review)56, 654–724 (2011). • A.T. Jennings, et al J Mater Res (invited paper) (2011) • Q. Sun, et al Scripta Mater65, 473-476 (2011) • C.R. Weinberger, et al J Mech Phys Solids (submitted, 2011) • A.T. Jennings, et al Acta Mater. doi:10.1016/j.actamat.2011.05.038 (2011). • A. Kunz, et al Acta Mater. 59, 4416–4424 (2011) • N. Friedman, et al (submitted, 2011) • D. Jang et al NanoLett.11 (4), 1743-1746 (2011) NSF-SUPPORTED GRADUATE STUDENTS Andrew Jennings (3rd year) Allison Kunz* (2nd year) Zach Aitken (1st year) SEMINARS (2010-2011): Harvard, KAIST, UIUC, Brown, UC San Diego, Los Alamos NL, Sandia NL CONFERENCES (2010-11): MRS, TMS, APS, IIW4 ASME, ECI, Plasticity 2011, SES Several“Micromechanics” and “Nano-materials” workshops

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