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Structural Uses for Ductile Ordered Alloys (1984) / Chapter Skim
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'CONCLUSIONS AND RECOMMENDATIONS'
Pages 1-6

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From page 1...
... , a limited cross slip, impurity locking of dislocations, and intrinsically brittle grain boundaries. Recent work at a number of different laboratories, however, has shown that the ductilities of ordered alloys can be dramatically improved by the
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From page 2...
... The number of research programs in the United States that concentrate on ordered alloys is rather small, particularly when compared to 15 years ago when there were many more programs in both industrial and university laboratories. An extensive, long-term program at the Air Force Wright Aeronautical Laboratories under the direction of Harry A
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From page 3...
... An adequate body of data must be available when qualification testing is required in order to support a decision to undertake such testing and the high costs involved. The titanium aluminides developed under Air Force sponsorship are well along the path towards usage, but development of the iron aluminides and the ductile nickel aluminides has proceeded only to the laboratory stage with some processing work only recently begun.
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From page 4...
... If the results of Phase I show that these alloys have sufficient promise, Phase II should be started in which both experimental and production lots of material are tested, materials processing optimization is undertaken, the effects of multiaxial stress states and product anisotropy are studied, joining techniques are investigated, and compatibilities with various environments are studied. Phase III should involve testing of multiple production runs of material, development of statistical distributions of mechanical property data, and the development of specifications.
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From page 5...
... Over the longer term, the committee expects that quantum mechanical calculations of equilibrium properties of ordered alloys will have a major impact on the development of additional alloys. Since only some of the trends in properties with changes in composition, state of long-range order, and defect structure, are understood, the development of new alloys is necessarily Edisonian in nature.
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Key Terms

  • grain boundary
  • gas turbine
  • turbine engines
  • disordered alloys
  • low density

  • nickel aluminides
  • titanium aluminides
  • primary processing
  • boundary strength
  • ductile iron

  • processing methods
  • crack growth
  • iron aluminides
  • space power
  • engineering properties

  • creep rate
  • rocket propulsion
  • grain boundaries
  • improve grain
  • materials processing

  • national gas
  • deformation processing
  • brittle grain
  • powder metallurgical
  • turbine blade

  • boundary properties
  • specified performance
  • low ductility
  • disordered materials
  • ductile nickel


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