Intermetallics, for example Fe–Ni–Ti aluminides, possess many attractive structural and functional properties. The Fe–Ni–Ti system is important because of its relevance to various materials, ranging from steels and Ni-based superalloys to alloyed aluminides, and from Ti-based corrosion-resistant alloys to shape-memory alloys and amorphous materials. Fe–Ni–Ti is also a sub-system of the Fe–Ni–Ti–Al quaternary system, which is the core system of the COST action ‘Thermodynamics of alloyed aluminides’. A reliable knowledge of phase diagrams and the creation of a thermodynamic database for modelling would be of great importance for further development of these novel materials.
Primary objectives of this project are a more complete description of the ternary Fe–Ni–Ti system, and a screening of the quaternary Fe–Ni–Ti aluminide system using the diffusion couple technique and additional individual alloys. The latter should provide a basis for further investigation of the quaternary Fe–Ni–Ti–Al system in collaboration with other groups within the European COST action.
Fig. 1. Examples of diffusion multiples between pure metals and/or alloys like TiAl/NiAl/FeAl produced to investigate phase relations in the quaternary Fe– Ni–Ti–Al system.
Fig. 2. SEM images of the diffusion multiples after annealing at 1000°C. (a) Interface between Al2FeNi, TiAl and Ti, and (b) interface between NiTi2 and Fe.
Ph.D. thesis of Liliana Duarte (2005 - 2009)
(External Ph.D. student working at EMPA Dübendorf)
- L. I. Duarte, U. E. Klotz, C. Leinenbach, M. Palm, F. Stein, J. F. Löffler, 'Experimental study of the Fe–Ni–Ti system', Intermetallics 18 (2010) 374 – 384.
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