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The diffusion of antimony in alpha iron

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Abstract

Diffusion coefficients of antimony in α-iron were determined in the temperature range 700 to 900°C using the residual activity method. Specimens were large-grained polycrystals for the higher temperature measurements and single crystals for the low temperature measurements. Above 800°C the data may be represented by the equationD sb(cm2/s) = (440 ± 200) exp [- (270,000 ± 7000)/RT]. The activation energy (reported in J/mole) is approximately equal to that measured for iron self-diffusion in this same temperature range, although the antimony diffusion coefficients are a factor of ten larger than the iron self diffusion coefficients. The potential for strongly coupled vacancy-antimony motions is demonstrated, based on the observed enhancement of iron self diffusion in dilute iron-antimony alloys. Finally molybdenum is shown to have a negligible effect on the diffusion of antimony in α-iron. These results are discussed in relation to the phenomenon of temper brittleness in steels. Embrittlement kinetics in iron-antimony alloys are shown to be consistent with an antimony diffusion controlled segregation mechanism.

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Authors and Affiliations

  1. Materials Sciences Division, Army Materials and Mechanics Research Center, 02172, Watertown, Mass.

    G. A. Bruggeman (Metallurgist)

  2. Department of Materials Science and Engineering, University of California, 94720, Berkeley, Calif.

    J. A. Roberts (Graduate Student)

Authors
  1. G. A. Bruggeman
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  2. J. A. Roberts
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Bruggeman, G.A., Roberts, J.A. The diffusion of antimony in alpha iron. Metall Trans A 6, 755–760 (1975). https://doi.org/10.1007/BF02672296

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