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Dresden 2003 – scientific programme

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M: Metallphysik

M 32: Intermetallische Phasen II

M 32.2: Talk

Wednesday, March 26, 2003, 16:45–17:00, IFW B

Nickel and Iron Tracer Diffusion in B2 Ni40Fe10Al50 Ternary Alloy — •S. Divinski1, F. Hisker1, Y.-S. Kang2, W. Löser3, U. Södervall4, and Chr. Herzig11Institut für Materialphysik, Universität Münster, Münster, Germany — 2Dep. Metallurgy and Materials Science, Hanyang University, Ansan, Korea — 3IFW Dresden, Dresden, Germany — 4Dep. Physics, Chalmers University of Technology, Göteborg, Sweden

The B2 binary alloy NiAl is a structural material for high-temperature applications. However, poor ductility at room temperature and insufficient creep resistance limits its industrial application. Addition of 10% of Fe was shown to improve the creep resistance. This finding was related to a minimum in the diffusion coefficient [1].

In the present work, Ni and Fe bulk diffusion in Ni40Fe10Al50 ternary alloy is investigated by means of radiotracer measurements (63Ni and 59Fe) and SIMS analysis (64Ni) in an extended temperature interval from 1000 to 1550 K. The results show that Ni and Fe diffuse in Ni40Fe10Al50 faster than in stoichiometric NiAl and the activation enthalpy of Ni diffusion is remarkably smaller in Ni40Fe10Al50 (∼250kJ/mol) as compared to stoichiometric NiAl (∼290kJ/mol). Moreover, the activation enthalpy of Ni diffusion in Ni50−xFexAl50 ternary alloys was found to reveal a minimum for ternary compositions with about 10% Fe addition. The diffusion mechanism and the controversial behavior of the creep resistance and the self-diffusivity in the NiFeAl ternary alloys is discussed.

[1] G. Sauthoff: Intermetallics (VCH Verlagsgesellschaft mbH, Weinheim, New York) 1995

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