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*   **  R&BD  ***   Abstract A CO2 laser overlay was conducted by using a Fe-based powder on the AC2B aluminum substrate. Cracks and intermetallic compounds (IMC) were observed inconsistently along the interface between the overlay and post-molten layer. A scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) detected some Fe-rich IMC (Fe3Al, FeAl) as well as the brittle Al-rich IMC (Fe2Al5, FeAl3). Micro vickers hardness proved the formation of Al-rich IMC (FeAl3) along the interface by showing HV0.1 800~900. Furthermore, nano indentation was successfully applied to investigate the behavior of IMC more precisely than the micro vickers hardness.

Intermetallic Compounds Behavior at Laser Overlay Interface of Aluminum and Fe-based Powder