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SUMMARY:Applications of Non-Equilibrium Thermodynamics for Phase Transform
 ation in Materials that Exhibit Glassy Transition
DTSTART:20260429T053000Z
DTEND:20260429T073000Z
DTSTAMP:20260424T021800Z
UID:indico-event-198@indico.phys.nthu.edu.tw
CONTACT:kuoan.wu@gmail.com
DESCRIPTION:Speakers: Tomorr Haxhimali (Lawrence Livermore National Labora
 tory)\n\nIn this talk I will start by quickly giving an overview of the gl
 ass transition and associated phase transformation like crystallization an
 d melting for materials that exhibit complex disorder structures. These fa
 ll into two categories: i) Imposed glassy transition from overdriven condi
 tions\, like those due to rapid cooling in Additive Manufacturing f.e. or 
 in materials at the wake of a shock wave\; and ii) Complex materials with 
 many chemical components\, like high entropy alloys (HEAs) or ZBLAN glasse
 s\, whose disordered structure comes naturally at ambient conditions.\nI w
 ill briefly present a Statistical Mechanics framework for the glassy trans
 ition that hints at a putative connection with the hierarchical Parisi's T
 ree framework that is successfully used in Spin Glasses.\nI will continue 
 with a study of the glassy transition for binary alloy during rapid solidi
 fication at different cooling rates. We use atomistic simulations and meso
 scopic phase field. The latter is enhanced by the use of Extended Irrevers
 ible Thermodynamics (EIT) that captures the effect of the transient regime
  prevalent in these conditions. Extending this method to more complicated 
 High Entropy Alloys will be discussed.\nThe last part of the talk will be 
 dedicated to the study of the devitrification (crystallization) process in
  ZBLAN (ZrF4-BaF2-LaF3-ALF3-NaF) glasses. ZBLAN glasses have intermediate 
 properties between metallic glasses and "classical" Si-based glasses. Thes
 e make these glasses versatile\; analogous to the semiconductors in the se
 miconducting industry. In fiber optics ZBLAN glasses provide superior opti
 cal properties. Difficulties in reaching these parameters are attributed t
 o crystal imperfections during manufacturing that can be associated with t
 he shear thinning effect and existence of convection flows in gravitationa
 l conditions. In this effort we have developped nucleation models from ato
 mistic and experimentally informed phase-field studies\, that consider con
 vection flow and dissipative effects through viscosity. We will conclude b
 y discussing lesson learned by the versatility of ZBLAN.\n* This work was 
 performed under the auspices of the US Dept. of Energy by Lawrence Livermo
 re National Security\, LLC under Contract DE-AC52-07NA27344. LLNL-ABS-8350
 32\n\nhttps://indico.phys.nthu.edu.tw/event/198/
LOCATION:L124\, Physics Building (NTHU)
URL:https://indico.phys.nthu.edu.tw/event/198/
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