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Study on Fe–Al layers of Fe/(Zn-11%Al-3%Mg-0.2%Si) solid–liquid diffusion couples

ABSTRACT In the present work, Fe/(Zn-11Al-3Mg-0.2Si) solid–liquid diffusion couples were held for different time periods at temperatures from 480 to 650°C to investigate the growth of Fe–Al layers. We found that FeAl3 and Fe2(Al, Si)5 phases formed on the diffusion couple interface; Si solubility in Fe2(Al, Si)5 was 1.4 at.% and the overall Fe–Al layer growth-rate time constant from 500 to 650°C ranged from 0.53 to 0.37. The layer growth rate was controlled by the inter-diffusion of Fe and Al. The overall Fe–Al layer kinetics of growth equation is . Overall Fe–Al layer thickness in the Fe/(Zn-11Al-3Mg-0.2Si) diffusion couple increased as temperature increased.