Metals

Effect of alloying on the self-diffusion activation energy in $\gamma$-iron

A. A. Vasil'ev, S. F. Sokolov, N. G. Kolbasnikov, D. F. Sokolov

Peter the Great St. Petersburg Polytechnic University

Abstract: The experimental data on the self-diffusion coefficient of austenite with different chemical compositions obtained by the radioactive isotope method have been analyzed quantitatively. The self-diffusion activation energy in pure $\gamma$-iron is shown to be $\sim$312 kJ/mol. Alloying of austenite with such elements as Mn, Mo, Nb, Ti, and Si (to a lower degree) increases the self-diffusion activation energy, and alloying with C, V, or Cr (for the element content $\ge$ 3 at%) decreases it. The empirical formula is derived for calculation of the self-diffusion activation energy in austenite solid solutions with complex composition.

Received: 21.04.2011

 English version: Physics of the Solid State, 2011, 53:11, 2194–2200

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