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Summary of the Workshop on Structural Nanomaterials (2001) / Chapter Skim
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Session 2: Fabrication and Production
Pages 9-16

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From page 9...
... a hindrance in consolidation. Benefits in consolidation such as high driving forces, short diffusion distances, and increased sinterability at low temperatures were offset by agglomeration of the particles, high interparticle friction, absorbed gases, and low compressibility.
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From page 10...
... Each of these methods was said to produce consolidated materials with limited thickness. One processing factor discussed in detail was the effect of powder size distribution on the green density of tungsten powder compacts, with the green density in turn having an effect on the final consolidated density.
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From page 11...
... Professor Mayo replied that she hadn't seen an advantage to microwave sintering in her work. Jim Rawers commented that microwaving of metal powders can be tricky owing to the possibility of localized surface melting.
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From page 12...
... The third presentation of the session, by Terence Langdon of the University of Southern California, was entitled "Processing of Ultrafine Grained Materials Through Severe Plastic Deformation: Potential for Achieving High Strength and a Superplastic Forming Capability." It addressed the use of severe plastic deformation to attain ultrafine grain sizes. Professor Langdon began his presentation by stating that methods under investigation for producing ultrapure "rained structures are not sufficient clue to difficulty in eliminating porosity and the inability to produce large structures.
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From page 13...
... James Rawers of the Department of Energy's Albany Research Center gave the final presentation of session 2, "Large Scale Production of and Fabrication with Metallic Nanomaterials: Barriers to Commercial Development of Nanotechnology for Structural Material Products." 13 Dr. Rawers began his presentation by describing the benefits and advantages of using attrition milling to fabricate nanocrystalline powders.
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From page 14...
... Challenges: Barriers: Control powder sizing (size and size distribution) and characteristics; Solve the limitations of high-temperature processing; Solve the myriad science and engineering issues to fulfill the promise of wet processing in terms of its scalability, low stresses, high throughput, and high homogeneity; Control orientation of grain boundaries; Model densification mechanisms (e.g., what leacis to grain growths; Generate accurate phase diagrams at the nanoscaTe; and Pursue industrial innovation/automation.
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From page 15...
... for measuring properties.
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Key Terms

  • wet processing
  • grain size
  • professor langdon
  • plastic deformation
  • severe plastic

  • size distribution
  • dry pressing
  • pressureless sintering
  • nanocrystalline ceramics
  • low stresses

  • ecap process
  • ultrafine grain
  • phase diagram
  • angular pressing
  • mayo reported

  • grain sizes
  • nanomaterials information
  • low temperatures
  • channel angular
  • myriad science

  • aluminum alloys
  • ultrafine grained
  • powder characteristics
  • pressure compaction
  • green density

  • engineering issues
  • processing offers
  • powder sizing
  • microwave sintering
  • equal channel


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