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The kinetics of the internal nitriding of Fe-2 at. pct Al alloy

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Abstract

The kinetics of the precipitation of aluminum nitride on internal nitriding the Fe-2 at. pct Al alloy was investigated for cold-rolled and recrystallized specimens exhibiting “ideally weak” interaction behavior of the solutes Al and N. The kinetic analysis was performed using mass-increase data obtained for thin foils (thickness ⪯0.1 mm) upon nitriding in a NH3/H2 gas mixture at temperatures in the range 803 to 853 K. Activation-energy analysis revealed that precipitation of AlN in the recrystallized specimens is associated with a Gibbs free energy barrier for the formation of a precipitate of critical size; the precipitation rate is controlled by both nucleation and growth. On the other hand, precipitation of AlN in the cold-rolled specimens occurs without a Gibbs free energy barrier for formation of a precipitate of critical size; the precipitation rate is controlled by growth with kinetics governed by volume diffusion of alu-minum. Analysis of the total Gibbs free energy of formation of AlN in the α-Fe matrix showed that in the case of the recrystallized specimens, the formation of incoherent AlN precipitates with a hexagonal crystal structure is favored. In the case of the cold-rolled specimens, containing a high dislocation density, the formation of coherent AlN precipitates with cubic crystal structure is favored, at least in the beginning of precipitation.

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Authors and Affiliations

  1. Laboratory of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628, AL, Delft, The Netherlands

    M. H. Biglari Ph.D. Student, C. M. Brakman (Senior Researcher), E. J. Mittemeijer (Professor) & S. Van Der Zwaag (Professor)

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  1. M. H. Biglari Ph.D. Student
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  2. C. M. Brakman
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  3. E. J. Mittemeijer
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  4. S. Van Der Zwaag
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Biglari, M.H., Brakman, C.M., Mittemeijer, E.J. et al. The kinetics of the internal nitriding of Fe-2 at. pct Al alloy. Metall Mater Trans A 26, 765–776 (1995). https://doi.org/10.1007/BF02649075

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