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Berlin 2005 – scientific programme

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M: Metallphysik

M 40: Diffusion I

M 40.4: Talk

Tuesday, March 8, 2005, 11:15–11:30, TU H2038

Nickel Radiotracer Diffusion in B2 Ordered Ni50−xFexAl50 Alloys — •Sergiy Divinski1, Frank Hisker1, Wolfgang Löser2, Ulf Södervall3, and Christian Herzig11Institut für Materialphysik, Universität Münster, Germany — 2IFW Dresden, Dresden, Germany — 3Department of Physics, Chalmers University of Technology,Göteborg, Sweden

Ni bulk diffusion was measured in a series of B2 ordered Ni50−xFexAl50 alloys. The 63Ni radioisotope in combination with the serial sectioning technique was applied at higher temperatures and the secondary ion mass spectrometry (the 64Ni isotope) was used in a low temperature range. In the temperature interval from 1050 to 1500 K, well-type Arrhenius temperature dependencies were established for all studied compositions. As the Fe content x in the Ni50−xFexAl50 ternary alloys increases, the Ni diffusivity generally increases. The activation enthalpy Q of Ni diffusion changes strongly non-monotonously in the ternary alloys between the binary end-members NiAl and FeAl revealing a pronounced minimum at the Ni40Fe10Al50 composition and a conspicuous maximum around the Ni25Fe25Al50 composition. The latter indicates additional ordering (e.g. of the L21 type) in the corresponding alloys.

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