Diffusion mechanism of iron in ternary (Ni,Fe)Al alloys with B2-structure

We have directly determined the atomistic diffusion mechanism of iron atoms in Ni 40Fe 10Al 50 and Ni 45Fe 5Al 50 intermetallic B2 alloys with quasielastic Mössbauer spectroscopy. Our measurements show a clear nearest-neighbour jump of Fe with an activation energy of 4.0(3) eV for both compositions...

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Bibliographic Details
Published in:Intermetallics 2003-06, Vol.11 (6), p.573-580
Main Authors: Rennhofer, M., Sepiol, B., Löser, W., Vogl, G.
Format: Article
Language:English
Subjects:
A. Nickel aluminides based on NiAl
B. Diffusion
D. Site occupancy
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Summary:We have directly determined the atomistic diffusion mechanism of iron atoms in Ni 40Fe 10Al 50 and Ni 45Fe 5Al 50 intermetallic B2 alloys with quasielastic Mössbauer spectroscopy. Our measurements show a clear nearest-neighbour jump of Fe with an activation energy of 4.0(3) eV for both compositions in agreement with recent tracer diffusion results for Ni diffusion in the NiAl compound with B2 structure. Direct next-nearest neighbour jumps can be definitely excluded as a jump mechanism for iron. Jump frequencies and the diffusion coefficient of iron have been measured. The diffusion of iron in ternary (Ni,Fe)Al is about two times faster than diffusion of nickel in the Ni 50Al 50 alloy.
ISSN:0966-9795
1879-0216
DOI:10.1016/S0966-9795(03)00039-6