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VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:Department of Mechanical & Industrial Engineering(Engineering
  Leadership Lecture) Presents:  Nanotwinned Materials: Weird Kinks and Str
 ength at the Nanoscale\, by Dr. Frederic Sansoz  
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260610T024911Z
UID:tag:localist.com\,2008:EventInstance_879979
DTSTART:20140926T143000Z
DTEND:20140926T153000Z
DESCRIPTION:~~Abstract: This seminar will present our recent progress in un
 derstanding the plasticity\, fracture and thermal transport behavior of bu
 lk materials and nanowires strengthened by nanoscale twins using massively
 -parallel atomistic simulations and state-of-the-art nanomechanical experi
 ments. The ability of twin boundaries (TBs) in strengthening and maintaini
 ng ductility has been well documented\; yet most understanding of the orig
 in of these properties relies on perfect-interface assumptions. We will sh
 ow that as-grown TBs in nanotwinned Cu and Ag-Cu alloys are inherently def
 ective with kink-like steps and curvature\, and that these imperfections p
 lay a key role in plastic deformation mechanisms. Furthermore\, a new type
  of size effect is observed in the fracture of ultra-thin Au nanowires ass
 ociated with a ductile-to-brittle transition as the twin size decreases to
  the angstrom-scale that leads to tensile strengths near the maximum theor
 etical limit. Also\, the fundamental role played by the number\, size and 
 orientation of twins in nanoscale heat conduction was investigated. Therma
 l conductivity calculations in model silicon materials containing nano-twi
 ns oriented either perpendicular or parallel to the transport direction re
 veal an unusual twin-size dependence with a change from interface phonon s
 cattering to homogeneous heat conduction resulting from the intrinsic cont
 ribution of the hexagonal TB structure. These important results suggest ne
 w avenues for designing common crystalline materials with coherent interfa
 ces at atomic scale for high-performance structural and energy conversion 
 applications.\n\nBrief Bio: Dr. Sansoz earned an engineer diploma in mecha
 nical and aerospace engineering and M.S. in materials science and engineer
 ing from the Ecole Nationale Supérieure de Mécanique et Aérotechnique i
 n Poitiers\, France (1996) and a Ph.D. with Honors in materials science an
 d engineering from Ecole des Mines de Paris (2000). Before joining the Uni
 versity of Vermont in 2004\, Dr. Sansoz was a post-doctoral fellow in mech
 anical engineering at the University of Rhode Island (2001-2002) and the J
 ohns Hopkins University (2002-2003). Dr. Sansoz is the recipient of a 2008
  National Science Foundation CAREER award and the 2009 College of Engineer
 ing and Mathematical Sciences Milt Silveira Junior Faculty Award at the Un
 iversity of Vermont.
LOCATION:Shillman\, 305
SUMMARY:Department of Mechanical & Industrial Engineering(Engineering Lead
 ership Lecture) Presents:  Nanotwinned Materials: Weird Kinks and Strength
  at the Nanoscale\, by Dr. Frederic Sansoz  
URL;VALUE=URI:https://calendar.northeastern.edu/event/department_of_mechani
 cal_industrial_engineering_engineering_leadership_lecture_presents_nanotwi
 nned_materials_weird_kinks_and_strength_at_the_nanoscale_by_dr_frederic_sa
 nsoz
CATEGORIES:Lecture
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