Mechanism of solid-state eutectoid transformation in an aluminium-zinc alloy |
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Authors: | N A Razik S A Maksoud |
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Institution: | (1) Faculty of Education, Ain Shams University, Cairo, Egypt;(2) Faculty of Science, University of Mansoura, Egypt |
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Abstract: | The growth rate of pearlite during isothermal transformation of an aluminium-zinc eutectoid has been determined experimentally.
Different theoretical models, assuming either volume or boundary diffusion of zinc to be a rate controlling mechanism for
the eutectoid transformation, have been applied. With volume diffusion models, the calculated growth rates were lower than
the experimental growth rates by a factor of three orders of magnitude. Reasonable agreement between the calculated and experimental
growth rates has been obtained on applying the boundary diffusion models. The activation energy for boundary diffusion of
zinc in the aluminium-zinc alloy was estimated to be ≅11.6 kcals/mole. |
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Keywords: | 61 64 81 |
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