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Structural Uses for Ductile Ordered Alloys (1984) / Chapter Skim
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'CURRENT RESEARCH ON ORDERED ALLOYS'
Pages 41-48

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From page 41...
... Noteworthy by its low level of support is the National Science Foundation, which is currently funding only two basic research efforts on aluminides, on the flow stress peak in Ni3Al, at the University of Pennsylvania, and some work on NiAl as part of a program at Case Western Reserve University to evaluate the effects of surface coatings on ductility of refractory metals. With the exception of some very innovative applications of alloying principles to produce fcc ordered alloys at Oak Ridge National Laboratory, there is no current effort to broaden our fundamental knowledge of structure, ordering kinetics, and mechanisms of plastic deformation in ordered alloys.
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From page 42...
... Blackburn Oak Ridge National Lab DOE (FeNi)
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From page 43...
... have related the high-temperature deformation behavior of Fe3Al in both the B2 and 003 forms to composition, degree of order, and ease of cross slip. The degree of order and cross slip are thought to explain the peak in strength below Tc; above Tc the cross slip of B2 superlattice dislocations is thought to be controlling, with the differences in various peak temperatures cited in the literature caused by slight variations in compositions.
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From page 44...
... . The temperature dependence of yield stress of Fe-Si and Fe-Al alloys has been related to the superlattice dislocation type, with this type thought to be dependent on the alloy composition (Glezer and Molotilov 1979)
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From page 45...
... CONCLUDING REMARKS Based on the information available in the open literature, the committee has concluded that coordinated efforts aimed at the development of new ordered alloys for structural applications are under way only in the United States and Japan. The two major efforts in the United States, at Wright-Patterson Air Force Base and at Oak Ridge National Laboratory, are, at present, the most productive and most highly successful.
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From page 46...
... 1979. Izvestiya Akademii Seriya Fizicheskaya 43:1426.
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From page 47...
... 1979. Izvestiya Vysshikh Uchebnykh Zavednenry Fizika 3:59.
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From page 48...
... F33615-78-C-5037 to Air Force Wright Aeronautical Laboratory. Dayton, Ohio: Systems Research Laboratories.
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Key Terms

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  • force wright
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  • temperature dependence
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  • force base

  • phase diagram
  • nasa feal
  • phase equilibria
  • structural applications
  • izvestiya vysshikh

  • byulleten vysshey
  • related work
  • vysshikh uchebnykh
  • aeronautical laboratory
  • mechanical behavior

  • vysshey attestatsionnoy
  • alloy research
  • heusler type
  • committee currently
  • solid state

  • representative recent
  • current effort
  • utilizing basic
  • eutectic superalloys
  • dislocation mobility


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