Browsing by Author "Anasyida, A. S"

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    Formation and Growth Kinetic of Intermetallic Layers on 304SS at Different Slurry Aluminizing Temperature and Time Using Si‑Al2O3‑Modified Aluminide Coating
    (Published by springer, 2025-05-18) AMBALI IBRAHIM OWOLABI; Anasyida, A. S; Abdullah, T. K; Dhindaw B. K
    The study explored how the presence of silicon (Si) and alumina influences the microstructures and growth kinetics of intermetallic compounds within aluminide coatings applied to 304 stainless steels. The aluminide coating was prepared via slurry aluminizing techniques and heat treated at 700 °C, 800 °C and 850 °C for 6, 8 and 10 h. The aluminide coating was characterized using field emission electron microscope-energy dispersive X-ray, X-ray diffraction and hardness. Multilayer phases were formed which comprise of binary phases ( Fe2Al5, FeAl3, FeAl and Fe3Al), and the Fe–Si–Al ternary phases ( Fe2Al3Si3, Fe4Al17.5Si1.5 and Fe4Al1.7Si). As the aluminizing temperature and time increase, the thickness of the brittle intermetallic layer ( Fe2Al5) layer decreases, while the thickness of the ductile intermetallic layers (FeAl and Fe3Al) increases. The growth rate of the layers obeyed a parabolic law. The activation energy for Fe2Al5 was − 174 kJ/mol, while the activation energy for FeAl and Fe3Al were 72 kJ/mol and 155 kJ/mol respectively. Microhardness measurement revealed that Fe2Al5, FeAl, and Fe3Al layers had hardness values of 880– 1010 HV, 570–630 HV, and 320–410 HV respectively at all aluminizing temperature and time. Fe2Al5 has the lowest toughness and the hardest zone in the aluminide coating. The Si addition effectively reduced the coating thickness of the brittle intermetallic layers and aided the growth of ductile intermetallic layers.