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Micro Arc Oxidation of Al-4Si, Al-4Mn and Al-4Mg Binary Alloys

100%

Oter Z., Gulec A., Gencer Y., Tarakci M.

Acta Physica Polonica A

2015

vol. 127

issue 4

1331-1335

Binary synthetic aluminum alloys Al-M (M = Mg, Mn, Si) containing 4 at.% alloying elements as substrate materials were prepared under controlled vacuum/argon atmosphere. The substrates were coated by micro arc oxidation (MAO) method for 120 minutes in aqueous alkaline electrolyte using the same electrical parameters. The phase constituents, chemical composition, surface roughness and the microstructure of the coatings were characterized by XRD, profilometry and SEM-EDS. The average coating thicknesses are 127 μm, 91 μm and 78 μm on Al-4Mn, Al-4Mg and Al-4Si alloys, respectively. All MAO coatings were composed of mullite (3Al₂O₃·2SiO₂) and γ-Al₂O₃ phases. In addition to these phases, α-Al₂O₃ phase, in the form of precipitates, was detected in coatings on Al-4Mn and Al-4Mg alloys. The presence of Si, Mn and Mg was detected in the coatings, depending of the chemical content of the substrate alloys.

Characterization of Ternary Mg-Sn-Mn Alloys

88%

Gulec A., Oter Z., Gunduz K., Tarakci M., Gencer Y.

Acta Physica Polonica A

2016

vol. 129

issue 4

596-599

Ternary Mg-2Sn-Mn (0.5, 1, 2, and 2.5 wt% Mn) alloys were prepared under vacuum/argon atmosphere controlled furnace to investigate their microstructural and mechanical properties as a potential biodegradable implant material. As-cast alloys were heat treated at 550°C for 24 h and then at 300°C for 16 h. The alloys were characterized as-cast and after the heat treatment by optical microscopy, scanning electron microscopy, X-ray diffraction, and microhardness measurement. Mg phase is evident for both as-cast and heat-treated alloys while Mg₂Sn intermetallic phase is detected in all heat treated alloys except Mg-2Sn-0.5Mn. The dendritic microstructure changed to a microstructure with equiaxed grains after the heat treatment. The increase of Mn in ternary Mg-2Sn-Mn alloys resulted in a microstructure composed of smaller grains. Moreover, microhardness of ternary alloys slightly increased with the addition of Mn.

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2 Acta Physica Polonica A

1 2016

1 2015

2 Gencer Y.

2 Gulec A.

2 Oter Z.

2 Tarakci M.

1 Gunduz K.

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Micro Arc Oxidation of Al-4Si, Al-4Mn and Al-4Mg Binary Alloys

Characterization of Ternary Mg-Sn-Mn Alloys