Processing and characterization of laser cladded Cu-Sn-Zn coatings on cast aluminum alloys

摘要: This paper describes the preliminary results of laser cladding experimentation a Sn-bronze bearing alloy (88Cu, 10Sn, 2Zn, all wt %) onto cast aluminum alloys AA390 and AA333 for improving surface properties. Experiments were performed while varying key processing parameters which are power, traverse speed, powder flowrate. Select microstructural, microchemistry, microhardness, geometry, crystallographic analyses using optical (OM) scanning electron microscopy (SEM), x-ray energy dispersive spectroscopy (EDS) diffractometry (XRD) presented. The coatings found to have very fine microstructures from rapid solidification (secondary dendrite arm spacings 0.6 1.9 μm) with microhardnesses ranging about 150 290 kgf/mm2. interface has been primary lamellar eutectic CuAl2 intermetallics, Sn-rich secondary phases, in amounts depending on extent dilution. General observations coating characteristics (such as porosity, debonding, dilution) their dependence also discussed.This coating...