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Investigation of the Capability of Molecular Dynamics Simulation in Interface Evolution: Uncertainties and Applications
Investigation of the Capability of Molecular Dynamics Simulation in Interface Evolution: U...
Investigation of the Capability of Molecular Dynamics Simulation in Interface Evolution: Uncertainties and Applications

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105223
ISBN  
9798291566466
DDC  
620.11
저자명  
Lyu, Meizhong.
서명/저자  
Investigation of the Capability of Molecular Dynamics Simulation in Interface Evolution: Uncertainties and Applications
발행사항  
[Sl] : University of Michigan, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
135 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: Holm, Elizabeth Ann.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2025.
초록/해제  
요약Molecular dynamics (MD) simulations serve as an indispensable complement to experimental research in materials science, offering unique capabilities to verify experimental observations, access to experimentally inaccessible quantities, and provide precise control over system parameters. This dissertation demonstrates the multifaceted applications of MD simulations across three distinct but interconnected research domains.The first study investigated uncertainty quantification and propagation in ensemble MD simulations of nickel grain growth. Aleatoric uncertainty was introduced through randomly assigned initial atomic velocities to individual atoms. This uncertainty propagated from the atomic scale to the microstructural scale during simulation evolution, and resulting in the differentiation of individual grain evolution trajectories across different simulation replicas. Visualization analysis of these parallel computational results revealed atomic-level velocity effects on microstructural evolution that are typically inaccessible through conventional experimental characterization methods. This study showed that even small differences in initial atomic velocities can lead to statistically significant divergences in microstructural evolution. It highlighted the necessity of ensemble simulations to accurately capture microstructural behavior.The second project developed a novel methodology for directly converting voxel-based experimental microstructural data into atomic-scale initial configurations for MD simulations. This approach preserves microstructural fidelity while accommodating different lattice types and multiple scaling requirements. Unlike experimental samples that inevitably contain impurities, MD simulations provide an idealized environment of pure materials without impurity interference. Comparison with experimental nickel polycrystal data demonstrated the method's capability to capture characteristic grain growth behavior. This chapter established a bridge between experimental and atomic-resolution simulations, successfully reproducing grain boundary characteristics observed in real materials. It further confirmed that the absence of a strong correlation between grain boundary migration velocity and curvature in polycrystals is unrelated to impurities, but instead arises from network-level effects.The third investigation addresses the challenging problem of calculating solid-liquid interfacial energy at non-melting temperatures using the energy conserving orientational force. While interfacial energy is crucial for solidification processes, it is experimentally difficult to measure, traditional MD approaches are limited to melting point calculations. This work employs simultaneous equation solving to determine both interfacial energy and mobility across supercooling temperature ranges. The results revealed a non-monotonic temperature dependence of interfacial energy and a positive temperature dependence of interfacial mobility. The application of synthetic driving forces enabled MD simulations under previously inaccessible conditions and provided new insights into the temperature dependence of solid-liquid interfacial properties.These studies illustrate the multifaceted capability of MD simulations in connecting atomic-scale phenomena to macroscopic properties, delivering mechanistic insights, and achieving systematic parameter control beyond the reach of conventional experimental approaches.
일반주제명  
Materials science
일반주제명  
Molecular physics
일반주제명  
Applied physics
일반주제명  
Physical chemistry
일반주제명  
Thermodynamics
키워드  
Computational material science
키워드  
Molecular dynamics simulation
키워드  
Interface physics
키워드  
Grain boundary
키워드  
Equilibrium
기타저자  
University of Michigan Materials Science and Engineering
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■24510▼aInvestigation  of  the  Capability  of  Molecular  Dynamics  Simulation  in  Interface  Evolution:  Uncertainties  and  Applications
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a135  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  Holm,  Elizabeth  Ann.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2025.
■520    ▼aMolecular  dynamics  (MD)  simulations  serve  as  an  indispensable  complement  to  experimental  research  in  materials  science,  offering  unique  capabilities  to  verify  experimental  observations,  access  to  experimentally  inaccessible  quantities,  and  provide  precise  control  over  system  parameters.  This  dissertation  demonstrates  the  multifaceted  applications  of  MD  simulations  across  three  distinct  but  interconnected  research  domains.The  first  study  investigated  uncertainty  quantification  and  propagation  in  ensemble  MD  simulations  of  nickel  grain  growth.  Aleatoric  uncertainty  was  introduced  through  randomly  assigned  initial  atomic  velocities  to  individual  atoms.  This  uncertainty  propagated  from  the  atomic  scale  to  the  microstructural  scale  during  simulation  evolution,  and  resulting  in  the  differentiation  of  individual  grain  evolution  trajectories  across  different  simulation  replicas.  Visualization  analysis  of  these  parallel  computational  results  revealed  atomic-level  velocity  effects  on  microstructural  evolution  that  are  typically  inaccessible  through  conventional  experimental  characterization  methods.  This  study  showed  that  even  small  differences  in  initial  atomic  velocities  can  lead  to  statistically  significant  divergences  in  microstructural  evolution.  It  highlighted  the  necessity  of  ensemble  simulations  to  accurately  capture  microstructural  behavior.The  second  project  developed  a  novel  methodology  for  directly  converting  voxel-based  experimental  microstructural  data  into  atomic-scale  initial  configurations  for  MD  simulations.  This  approach  preserves  microstructural  fidelity  while  accommodating  different  lattice  types  and  multiple  scaling  requirements.  Unlike  experimental  samples  that  inevitably  contain  impurities,  MD  simulations  provide  an  idealized  environment  of  pure  materials  without  impurity  interference.  Comparison  with  experimental  nickel  polycrystal  data  demonstrated  the  method's  capability  to  capture  characteristic  grain  growth  behavior.  This  chapter  established  a  bridge  between  experimental  and  atomic-resolution  simulations,  successfully  reproducing  grain  boundary  characteristics  observed  in  real  materials.  It  further  confirmed  that  the  absence  of  a  strong  correlation  between  grain  boundary  migration  velocity  and  curvature  in  polycrystals  is  unrelated  to  impurities,  but  instead  arises  from  network-level  effects.The  third  investigation  addresses  the  challenging  problem  of  calculating  solid-liquid  interfacial  energy  at  non-melting  temperatures  using  the  energy  conserving  orientational  force.  While  interfacial  energy  is  crucial  for  solidification  processes,  it  is  experimentally  difficult  to  measure,  traditional  MD  approaches  are  limited  to  melting  point  calculations.  This  work  employs  simultaneous  equation  solving  to  determine  both  interfacial  energy  and  mobility  across  supercooling  temperature  ranges.  The  results  revealed  a  non-monotonic  temperature  dependence  of  interfacial  energy  and  a  positive  temperature  dependence  of  interfacial  mobility.  The  application  of  synthetic  driving  forces  enabled  MD  simulations  under  previously  inaccessible  conditions  and  provided  new  insights  into  the  temperature  dependence  of  solid-liquid  interfacial  properties.These  studies  illustrate  the  multifaceted  capability  of  MD  simulations  in  connecting  atomic-scale  phenomena  to  macroscopic  properties,  delivering  mechanistic  insights,  and  achieving  systematic  parameter  control  beyond  the  reach  of  conventional  experimental  approaches.
■590    ▼aSchool  code:  0127.
■650  4▼aMaterials  science
■650  4▼aMolecular  physics
■650  4▼aApplied  physics
■650  4▼aPhysical  chemistry
■650  4▼aThermodynamics
■653    ▼aComputational  material  science
■653    ▼aMolecular  dynamics  simulation
■653    ▼aInterface  physics
■653    ▼aGrain  boundary
■653    ▼aEquilibrium
■690    ▼a0794
■690    ▼a0215
■690    ▼a0348
■690    ▼a0609
■690    ▼a0494
■71020▼aUniversity  of  Michigan▼bMaterials  Science  and  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359845▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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