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Transmission Electron Microscopy of Fe2Nb Laves Phase with C14 structure in Fe-Nb-Ni Alloys

Published online by Cambridge University Press:  21 September 2018

Naoki Takata ,
Shigehiro Ishikawa ,
Takashi Matsuo  and
Masao Takeyama
Naoki Takata
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, JAPAN "Fundamental Studies on Technologies for Steel Materials with Enhanced Strength and Functions" Consortium of JRCM (The Japan Research and Development Center for Metals)
Shigehiro Ishikawa
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, JAPAN
Takashi Matsuo
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, JAPAN "Fundamental Studies on Technologies for Steel Materials with Enhanced Strength and Functions" Consortium of JRCM (The Japan Research and Development Center for Metals)
Masao Takeyama
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, JAPAN "Fundamental Studies on Technologies for Steel Materials with Enhanced Strength and Functions" Consortium of JRCM (The Japan Research and Development Center for Metals)
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Abstract

The lattice structure of the C14 Fe2Nb Laves phase with Ni in solution in Fe-Nb-Ni ternary alloys was examined by transmission electron microscopy. Binary stoichiometric Fe2Nb (Fe-33.3 at.% Nb) exhibits a featureless morphology with a low dislocation density. A similar morphology was observed in stoichiometric Fe2Nb containing 20 at.% Ni and in binary Fe-rich Fe2Nb (Fe-27.5 at.% Nb). In contrast, many planar faults parallel to the basal plane of the C14 structure were observed in Fe-rich Fe2Nb with Ni in solution, and the fault density increases with increasing Ni content up to 33.1 at.%. The high resolution transmission electron microscope (HRTEM) analysis revealed that the planar faults are related to the local change in the stacking sequence of the three 36-nets (triple layer) of the C14 structure. These results suggest that the presence of both, the point defects (Fe sublattice sites occupied by Ni atoms) and the anti-site defects (Nb sublattice sites occupied by excess Fe atoms), facilitate the formation of the planar faults.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U08-06
Copyright
Copyright © Materials Research Society 2009

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