Influence of Fe substitutions on the deformation behavior and fault energies of Ni3Ge-Fe3Ge L12 intermetallic alloys

T. J. Balk, Mukul Kumar, K. J. Hemker

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20 Scopus citations


Ni3Ge exhibits a yield strength anomaly, whereas the yield strength of Fe3Ge shows a normal decline with temperature, and there is a gradual transition from anomalous to normal behavior as Fe content increases. A dramatic strengthening for 77 K deformation has also been noted to occur in these alloys as a result of increasing Fe content. The combined use of transmission electron microscopy (TEM) and image simulations has facilitated identification of the operative deformation mechanisms and allowed for a quantitative measure of superdislocation dissociations. A transition from octahedral glide and Kear-Wilsdorf locking to cube glide of superdislocations has been observed to coincide with an increase in either deformation temperature or Fe content. The low-temperature strengthening has been correlated with enhanced cross-slip, which is aided by a significant lowering of the cube-plane antiphase boundary energy with increasing Fe content. It is proposed that the strengthening and the transition to cube glide are promoted by an increase in the complex stacking fault energy, which enhances both cross-slip and cube-plane mobility.

Original languageEnglish
Pages (from-to)1725-1736
Number of pages12
JournalActa Materialia
Issue number10
StatePublished - Jun 13 2001

Bibliographical note

Funding Information:
This work was supported by the US Air Force Office of Scientific Research (#F49620-95-1-0280) and the NSF-NYI program (#DMR-9457964). The Electron Microscopy Center at Johns Hopkins University has been generously supported by the NSF (#EAR-9512438) and the W. M. Keck Foundation. The authors also wish to thank Dr D. M. Dimiduk of Wright-Patterson Air Force Base for help in alloy preparation for this study. Partial support for MK received under the auspices of the Department of Energy and Lawrence Livermore National Laboratory (University of California) through contract #W-7405-Eng-48 is gratefully acknowledged.


  • Dislocations (mobility)
  • Image simulation
  • Intermetallic compounds
  • Mechanical properties (plastic)
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys


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