Liquid Phase Separation Behaviors in Cu-Fe Alloy Coatings Synthesized by Laser Cladding
A Fep/Cu composite coating was developed based on laser cladding process in immiscible liquid system. The microstructure of the coatings is characterized by a homogeneous distribution of Fe-rich spherical particles dispersed in the Cu-rich matrix. The size of the Fe-rich spheres decreases and their number density increases with the decrease of the heating input. The micro-hardness and wear resistance results show that the micro-hardness of the composite coating (spherical particle (380 ~ 450 HV0.2) and the Cu-rich matrix about 200 HV0.2) is far better than that of the copper (70 HV0.2), the wear resistance of the composite coating is almost twice of the copper. Such Fep/Cu structure composite coating have a good combination of high strength and corrosion resistance (Fe-rich phase) and high electric and thermal conductivities (Cu-rich phase) with many potential advanced applications in electronic devices.
Jian-Feng Nie and Allan Morton
Y. Lu and Y. Z. He, "Liquid Phase Separation Behaviors in Cu-Fe Alloy Coatings Synthesized by Laser Cladding", Materials Science Forum, Vols. 654-656, pp. 1864-1867, 2010