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M: Metallphysik

M 49: Grenzfl
ächen I

M 49.4: Vortrag

Dienstag, 8. März 2005, 15:30–15:45, TU H2038

Effect of Impurities on Triple Junction Motion in Aluminum. — •V.A. Ivanov¹, D.A. Molodov¹, L.S. Shvindlerman^1,2, and G. Gottstein¹ — ¹Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, 52056 Aachen, Germany — ²Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Distr., 142432 Russia

The results of an investigation of the steady-state motion of grain boundary systems with triple junctions in aluminum with different magnesium content (0.1 ppm-1000 ppm) will be presented.

The migration of triple junction systems was studied in-situ in the temperature range between 543 and 723K using an SEM. The contact angle at the tip of the triple junctions was measured. The effect of the triple junction is discussed in term of a dimensionless criterion Λ which describes the drag influence of the triple junction on the motion of the entire boundary system.

The experiments revealed that the motion of boundary systems, studied in the entire temperature range, is controlled by grain boundary kinetics irrespective of the Mg content. The drag effect of triple junctions on grain growth in 2D systems will be discussed.

Grain boundary mobility was found to depend on material purity. The dependence of grain boundary activation parameters (activation enthalpy and pre-exponential factor) on the Mg content will be analyzed.