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Metallurgical and Materials Transactions A

, Volume 30, Issue 4, pp 991–1001 | Cite as

Slip transfer and dislocation nucleation processes in multiphase ordered Ni-Fe-Al alloys

  • A. Misra
  • R. Gibala
Article

Abstract

Directionally solidified (DS) alloys with the nominal composition Ni-30 at. pct Fe-20 at. pct Al having eutectic microstructures were used to study slip transfer across interphase boundaries and dislocation nucleation at the interfacial steps. The slip transfer from the ductile second phase, γ(fcc) containing ordered γ′(L12) precipitates, to the ordered β(B2) phase and the generation of dislocations at the interface steps were interpreted using the mechanisms proposed for similar processes involving grain boundaries in polycrystalline single-phase materials. The criteria for predicting the slip systems activated as a result of slip transfer across grain boundaries were found to be applicable for interphase boundaries in the multiphase ordered Ni-Fe-Al alloys. The potential of tailoring the microstructures and interfaces to promote slip transfer and thereby enhance the intrinsic ductility of dislocation-density-limited intermetallic alloys is discussed.

Keywords

Material Transaction Slip System Burger Vector Slip Plane Interphase Boundary 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1999

Authors and Affiliations

  • A. Misra
    • 1
  • R. Gibala
    • 2
  1. 1.Materials Science and Technology DivisionLos Alamos National LaboratoryLos Alamos
  2. 2.the Department of Materials Science and EngineeringUniversity of MichiganAnn Arbor

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