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Original scientific paper

Laser Surface Treatment of Mg-Al-Zn Alloys

Leszek Adam DOBRZANSKI orcid id orcid.org/0000-0002-7584-8917 ; Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland
Tomasz TANSKI ; Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland
Szymon MALARA ; Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland
Justyna DOMAGALA ; Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland
Andrzej KLIMPEL ; Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland


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Abstract

In this paper the structure and properties investigations results of the cast
magnesium alloys in the as cast state, after heat treatment and laser surface
treatment are presented. The aim of this work was to improve the surface
layer properties of the Mg-Al-Zn cast magnesium alloys by melting and
feeding of TiC, VC, WC, SiC, NbC and Al2O3 particles onto the surface.
Laser processing was carried out using high diode power laser (HDPL).
A series of experiments was carried out with varying scan rates and laser
power. The resulting surface layers were examined using metallographic
optical microscopy, scanning electron microscopy, X-ray diffraction,
microhardness measurements and corrosion resistance tests. Mg-Al-Zn
alloys after laser treatment are characterized by two zones: alloyed zone
(AZ) and heat affected zone (HAZ) with different thickness and shape
depending on laser power and ceramic powder used. Alloyed zone is
composed mostly of dendrites with the Mg17Al12 lamellar eutectic and Mg
in the interdendritic areas. The increase of microhardness from about 50
HV0,1 to about 200 HV0,1 in alloyed zone were observed.

Keywords

HDPL; Laser alloying; Magnesium alloys; Mechanical properties; Structure

Hrčak ID:

74518

URI

https://hrcak.srce.hr/74518

Publication date:

28.2.2011.

Article data in other languages: croatian

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