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JWJ > Volume 25(3); 2007 > Article
Journal of KWJS 2007 June;25(3) :51-56.
Published online July 19, 2007.
Intermetallic Compounds Behavior at Laser Overlay Interface of Aluminum and Fe-based Powder
Namhyun Kang, Yeon-Gon Yoo, Chang-Woo Lee, Jeong-Han Kim



Correspondence:   Published online July 19, 2007
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 (Fe₃ Al, FeAl) as well as the brittle Al-rich IMC (Fe₂Al?, 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.
Keywords: CO₂ laser;Overlay;Fe-Al intermetallic compound;Interface;Micro vickers hardness;Nano indentation
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