Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 34: Poster Session
MM 34.34: Poster
Dienstag, 1. April 2014, 18:00–20:00, P4
Interdiffusion studies of B2 Ni-Al-Si alloys at 1173 K — •Dandan Liu1,2, Lijun Zhang1, Yong Du1, Sergiy Divinski2, and Gerhard Wilde2 — 1State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, PR China — 2Institute of Materials Physics, Westfälische-Wilhelms University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
The knowledge of diffusion is fundamental for the production of B2 NiAl alloys as well as their use in technological applications. In the present work, Si was added to B2 NiAl alloys, and the interdiffusion of B2 Ni-Al-Si alloys at 1173 K was investigated via the Matano-Kirkaldy method by utilizing five groups of bulk diffusion couples and the electron probe microanalysis technique. The reliability of the obtained interdiffusivites was validated by thermodynamic constraints as well as by Fick*s second law applied to a numerical simulation. The results show that the presently obtained diffusivities can satisfactorily simulate the measured concentration profiles. Besides, the addition of Si was found to have different effect on the diffusion of Al in Ni-rich and nearly stoichiometric NiAl alloys. The possible reasons were interpreted in terms of cross diffusivities, site occupations, and different diffusion mechanisms. The present work provides valuable information for understanding diffusion in B2 NiAl-X alloys, where X occupies the Al sublattice.