Nanoindentation study on solid solution softening of Fe-rich Fe2Nb Laves phase by Ni in Fe–Nb–Ni ternary alloys |
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| Affiliation: | 1. Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan;2. School of Engineering, Brown University, Providence, RI 02912, USA;1. Forschungszentrum Juelich, IEK-2, 52425 Juelich, Germany;2. Now with: TU Wien, Institut of Materials Science and –Technology, Getreidemarkt 9, E308, 1060 Vienna, Austria;3. Thermochemistry of Materials Scientific Research Centre, NUST MISIS, Leninsky prosp. 4, 119049 Moscow, Russia;4. Institute for Materials Applications in Mechanical Engineering, RWTH Aachen University, Augustinerbach 4, 52062 Aachen, Germany;1. Centre for Advanced Steels Research, Box 4200, FI-90014 University of Oulu, Finland;2. Department of Process and Environmental Engineering, Box 4300, FI-90014 University of Oulu, Finland;1. Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Shagang School of Iron and Steel, Soochow University, Suzhou 215021, China;3. Department of Chemistry and Materials Science, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan;1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;2. State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, China;3. College of Science, Yanshan University, Qinhuangdao 066004, China |
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| Abstract: | In an attempt to understand the solid solution softening by Ni of an Fe-rich Fe2Nb Laves phase that is in equilibrium with γ-Fe, we have examined the defect structure in the Laves phase in Fe–Nb–Ni alloys by transmission electron microscopy, and its hardness as a function of orientation and solute (Ni) content by nanoindentation. The binary Fe-rich Laves phase and the ternary Laves phases with lower Ni content (18%) exhibit a featureless morphology with low dislocation density, whereas the ternary Laves phase with higher Ni content (33%) includes basal planar faults extending to several micrometers, producing a local change in the stacking sequence of the three 36-nets (triple layer) of the C14 structure. The hardness of the binary and the ternary Laves phases with 18% Ni in solution is almost constant and independent of orientation, whereas the ternary Laves phase with 33% Ni in solution exhibits a substantial dependence of hardness on orientation and this dependence appears associated with the ease of basal slips evidenced by slip traces around nanoindents. The relative ease in activating basal slip in the presence of a large amount of Ni in solution is thought to be the dominant contributor to the observed solid solution softening. |
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| Keywords: | Laves phases Plastic deformation Planar faults Transmission electron microscopy Nanoindentation |
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