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SUMMARY:Theoretical and Experimental Studies on Deformation and Fracture o
 f Metallic Glasses. - Dr Wenqing Zhu\, CUED 
DTSTART:20250214T140000Z
DTEND:20250214T143000Z
UID:TALK227773@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:Metallic glasses possess outstanding mechanical properties\, i
 ncluding high yield strength\, large elastic limits\, and excellent fractu
 re toughness\, positioning them as promising materials for applications in
  load-bearing structures\, sports equipment\, and beyond. However\, their 
 brittle fracture behavior\, characterized by localized shear band instabil
 ity\, remains a critical challenge. The lack of crystalline structures and
  well-defined defects in metallic glasses complicates the understanding of
  the underlying mechanisms responsible for such behavior. This talk presen
 ts a comprehensive investigation into the deformation mechanisms of metall
 ic glasses. A thermodynamically consistent continuum model is developed to
  capture viscoplastic deformation and the evolution of spatial heterogenei
 ty. The model\, which correlates local viscoplastic strain rates with the 
 atomic flux gradient tensor\, is implemented in the open-source finite ele
 ment platform FEniCS. It successfully reproduces key deformation phenomena
 \, including shear band localization\, creep\, and cavitation under divers
 e loading conditions. Additionally\, laser shock experiments were performe
 d to examine the fracture behavior of metallic glasses under ultrahigh str
 ain rates (>10⁷ s⁻¹). Cu₅₀Zr₅₀ metallic glass ribbons demonst
 rated near-ideal fracture strengths\, surpassing those of crystalline meta
 ls under similar conditions. The talk will also discuss void growth kineti
 cs during tension\, shedding light on the fracture processes of metallic g
 lasses at extreme strain rates.
LOCATION:Oatley 1 Meeting Room\, Department of Engineering
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