Functionally Graded Materials With Laser Cladding.
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J.T.M. De Hosson & Y.T. Pei
Functionally graded materials with laser cladding J.Th.M. De Hosson and Y.T. Pel Department of Applied Physics, Materials Science Center and Netherlands Institute for Metals Research, University of Groningen, The Netherlands. Abstract Al-40 w/o Si functionally graded materials (FGMs) were produced by a one- step laser cladding process on cast Al-alloy substrate as a possible solution for interfacial problems often present in laser coatings. The microstructure of the FGMs consists of a large amount of silicon primary particles surrounded by a-Al dendritic halos and by Al/Si eutectic. The Si particles exhibit a continuous increase in both size and volume fraction, from 8.5 urn and 22.7% at the bottom to 52um and 31.4% at the top of the FGM layer, respectively. Many five-fold branched Si particles (Sip) were observed in Al-40wt%Si functionally graded materials produced by a single step laser cladding process on cast Al-alloy substrate. In this paper in particul