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Laser-modified aluminium surfaces with iron

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Abstract

Possible improvements in the mechanical properties of surface-coated aluminium have been investigated. Aluminium plasma sprayed with iron powder was processed using two different laser-beam settings (integrated and defocused) with varying processing parameters. Mechanical and microstructural characterizations of the specimens revealed great differences between the two laser-beam settings. The defocused laser beam showed a clear improvement of hardness which was not observed for the integrated laser beam. The integrated laser beam gave deep melt pools with large Al3Fe particles (10–200 μm) in the top layer, and smaller α-Al (Fe, Mn)Si particles (0.1–0.3 μm) throughout the melt pool. Small, partly coherent Al3Fe precipitates (0.25 μm long) were found between the large Al3Fe particles. Processing with a defocused laser beam produced a shallower melt pool with a homogeneous distribution of the iron in the form of Al3Fe particles.

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Author notes

  1. L. Gjønnes

    Present address: SINTEF SI, P.O. Box 124 Blindern, 0314, Oslo, Norway

Authors and Affiliations

  1. Center for Materials Research/Department of Physics, University of Oslo, P. O. Box 1048, 0316, Oslo, Norway

    L. Gjønnes & A. Olsen

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  1. L. Gjønnes
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  2. A. Olsen
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Gjønnes, L., Olsen, A. Laser-modified aluminium surfaces with iron. Journal of Materials Science 29, 728–735 (1994). https://doi.org/10.1007/BF00445986

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