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3D Correlative Microscopy to Understand Processing-structure Relationships in Laser Powder Bed Fusion Aluminum Refined by in Situ Reactions
3D Correlative Microscopy to Understand Processing-structure Relationships in Laser Powder...
3D Correlative Microscopy to Understand Processing-structure Relationships in Laser Powder Bed Fusion Aluminum Refined by in Situ Reactions

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152946
ISBN  
9798342142700
DDC  
530.41
저자명  
Sinclair, Daniel.
서명/저자  
3D Correlative Microscopy to Understand Processing-structure Relationships in Laser Powder Bed Fusion Aluminum Refined by in Situ Reactions
발행사항  
[Sl] : Purdue University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
129 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
주기사항  
Advisor: Chawla, Nikhilesh;Titus, Michael;Trumble, Kevin;Zhang, Xinghang.
학위논문주기  
Thesis (Ph.D.)--Purdue University, 2024.
초록/해제  
요약The production of aluminum components by laser powder bed fusion additive manufacturing (LPBF-AM) offers simultaneous weight reduction benefits through low material density and topology optimization. The primary limitation of the method - hot cracking in high-strength compositions - is addressed by the reactive additive manufacturing (RAM) process, which introduces ceramic-forming metallic particles to powder feedstock. In situreactions subsequently inoculate equiaxed grains, prevent cracking, and strengthen the resulting alloy. The adoption of RAM alloys in aerospace applications requires the elimination of heterogeneous defects, requiring an understanding of laser processing effects and feedstock quality. To meet these needs, the collected work presents characterization methods based on x-ray tomography, seeking to establish novel descriptors for RAM feedstock and microstructures.In the first two chapters, x-ray microscopy (XRM) is applied to produce multi-dimensional particle measurements for feedstock powder qualification. Evolving existing measure-and-classify processes, a method is described to characterize AA7050-RAM2 feedstock that is rapid, interpretable, and descriptive of the highly deformed particles observed. Applying the developed methodology to an analysis of recycled AA7050-RAM2 rationalizes decreasing particle sizes by identifying the selective removal of specific shape classes. Combined with quantitative electron microscopy of particle microstructures, sieving and heat effects are comprehensively reported, demonstrating a modernized powder analysis workflow.In the second two chapters, the characteristic reactions seen in LPBF of AA7050-RAM2 are characterized. Correlative SEM/EDS and nanoindentation identified reactive phases and their mechanical properties and found a correlation between the extent of the Al-Ti reaction and the degree of particle remelting. Using 3D XRM measurements, the populations and distributions of low- and high-reaction particles were quantified, raising questions regarding homogenization mechanisms in laser-processed, particle-reinforced alloys. Thus, thin wall samples were produced and characterized to visualize convective and thermal history effects within symmetrical tracks. Novel observed mechanisms include thermal grain coarsening, keyhole-induced convection, and pore segregation by size. The accumulated microstructural quantification and novel perspective on pore movement provide a basis to improve contouring processes in RAM alloys and to better align fluid dynamics models of printing with experimental data.
일반주제명  
Solidification
일반주제명  
Fluid dynamics
일반주제명  
Homogenization
일반주제명  
Energy
일반주제명  
Grain size
일반주제명  
Cracks
일반주제명  
Microstructure
일반주제명  
Corrosion
일반주제명  
Raw materials
일반주제명  
Grain growth
일반주제명  
Metal fatigue
일반주제명  
Ductility
일반주제명  
Microscopy
일반주제명  
Aluminum alloys
일반주제명  
Design
일반주제명  
Eigenvalues
일반주제명  
Alloys
일반주제명  
Fluid mechanics
일반주제명  
Industrial engineering
일반주제명  
Materials science
기타저자  
Purdue University.
기본자료저록  
Dissertations Abstracts International. 86-04B.
전자적 위치 및 접속  
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MARC

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■0820  ▼a530.41
■1001  ▼aSinclair,  Daniel.
■24510▼a3D  Correlative  Microscopy  to  Understand  Processing-structure  Relationships  in  Laser  Powder  Bed  Fusion  Aluminum  Refined  by  in  Situ  Reactions
■260    ▼a[Sl]▼bPurdue  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a129  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-04,  Section:  B.
■500    ▼aAdvisor:  Chawla,  Nikhilesh;Titus,  Michael;Trumble,  Kevin;Zhang,  Xinghang.
■5021  ▼aThesis  (Ph.D.)--Purdue  University,  2024.
■520    ▼aThe  production  of  aluminum  components  by  laser  powder  bed  fusion  additive  manufacturing  (LPBF-AM)  offers  simultaneous  weight  reduction  benefits  through  low  material  density  and  topology  optimization.  The  primary  limitation  of  the  method  -  hot  cracking  in  high-strength  compositions  -  is  addressed  by  the  reactive  additive  manufacturing  (RAM)  process,  which  introduces  ceramic-forming  metallic  particles  to  powder  feedstock.  In  situreactions  subsequently  inoculate  equiaxed  grains,  prevent  cracking,  and  strengthen  the  resulting  alloy.  The  adoption  of  RAM  alloys  in  aerospace  applications  requires  the  elimination  of  heterogeneous  defects,  requiring  an  understanding  of  laser  processing  effects  and  feedstock  quality.  To  meet  these  needs,  the  collected  work  presents  characterization  methods  based  on  x-ray  tomography,  seeking  to  establish  novel  descriptors  for  RAM  feedstock  and  microstructures.In  the  first  two  chapters,  x-ray  microscopy  (XRM)  is  applied  to  produce  multi-dimensional  particle  measurements  for  feedstock  powder  qualification.  Evolving  existing  measure-and-classify  processes,  a  method  is  described  to  characterize  AA7050-RAM2  feedstock  that  is  rapid,  interpretable,  and  descriptive  of  the  highly  deformed  particles  observed.  Applying  the  developed  methodology  to  an  analysis  of  recycled  AA7050-RAM2  rationalizes  decreasing  particle  sizes  by  identifying  the  selective  removal  of  specific  shape  classes.  Combined  with  quantitative  electron  microscopy  of  particle  microstructures,  sieving  and  heat  effects  are  comprehensively  reported,  demonstrating  a  modernized  powder  analysis  workflow.In  the  second  two  chapters,  the  characteristic  reactions  seen  in  LPBF  of  AA7050-RAM2  are  characterized.  Correlative  SEM/EDS  and  nanoindentation  identified  reactive  phases  and  their  mechanical  properties  and  found  a  correlation  between  the  extent  of  the  Al-Ti  reaction  and  the  degree  of  particle  remelting.  Using  3D  XRM  measurements,  the  populations  and  distributions  of  low-  and  high-reaction  particles  were  quantified,  raising  questions  regarding  homogenization  mechanisms  in  laser-processed,  particle-reinforced  alloys.  Thus,  thin  wall  samples  were  produced  and  characterized  to  visualize  convective  and  thermal  history  effects  within  symmetrical  tracks.  Novel  observed  mechanisms  include  thermal  grain  coarsening,  keyhole-induced  convection,  and  pore  segregation  by  size.  The  accumulated  microstructural  quantification  and  novel  perspective  on  pore  movement  provide  a  basis  to  improve  contouring  processes  in  RAM  alloys  and  to  better  align  fluid  dynamics  models  of  printing  with  experimental  data.
■590    ▼aSchool  code:  0183.
■650  4▼aSolidification
■650  4▼aFluid  dynamics
■650  4▼aHomogenization
■650  4▼aEnergy
■650  4▼aGrain  size
■650  4▼aCracks
■650  4▼aMicrostructure
■650  4▼aCorrosion
■650  4▼aRaw  materials
■650  4▼aGrain  growth
■650  4▼aMetal  fatigue
■650  4▼aDuctility
■650  4▼aMicroscopy
■650  4▼aAluminum  alloys
■650  4▼aDesign
■650  4▼aEigenvalues
■650  4▼aAlloys
■650  4▼aFluid  mechanics
■650  4▼aIndustrial  engineering
■650  4▼aMaterials  science
■690    ▼a0791
■690    ▼a0389
■690    ▼a0204
■690    ▼a0546
■690    ▼a0794
■71020▼aPurdue  University.
■7730  ▼tDissertations  Abstracts  International▼g86-04B.
■790    ▼a0183
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164305▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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