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A Comparative Study on Boride Layer Morphology of Fe-4Co, Fe-4V and Fe-4W Binary Alloys

100%

Azakli Y., Gunduz K., Tarakci M., Gencer Y.

Acta Physica Polonica A

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2015

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vol. 127

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issue 4

1326-1330

EN

In this study, the pack boronizing behavior of Fe-4M alloys (at.% M=W, V, Co) along with pure iron was investigated. The boronizing process was carried out at 1100°C for 3 h. The morphology, microstructure, boride layer thickness and surface properties of the formed boride layers were characterized by XRD, SEM-EDS and profilometry. The average boride layer thicknesses were 85 μm, 130 μm, 275 μm and 280 μm for Fe-4W, Fe-4V, Fe-4Co binary alloys and pure Fe, respectively. The surface roughness was not changed with the addition of alloying element into the substrate. FeB and Fe₂B phases exist on all boronized samples, but their ratio changes owing to alloying elements in the substrate. The saw-tooth morphology has transformed to a smoother boride layer with the addition of alloying elements of W and V, though Co addition was ineffective on saw tooth morphology. In addition, a transition zone under the boride layer was observed for the boronized Fe-W and Fe-V alloys. The formation of precipitates of boride of alloying elements was evident in the boride layer and in the transition zone for borided Fe-4V and Fe-4W alloys. Co has made a solid solution with iron in boride by replacing iron in the boride lattice.

2

Characterization of Ternary Mg-Sn-Mn Alloys

88%

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

Acta Physica Polonica A

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2016

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vol. 129

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issue 4

596-599

EN

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.

3

Boriding of Equiatomic Fe-Mn Binary Alloy

88%

Calik A., Gencer Y., Tarakci M., Gunduz K., Gulec A.

Acta Physica Polonica A

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2013

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vol. 123

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issue 2

449-452

EN

Synthetic equiatomic Fe-Mn binary alloy was prepared under vacuum-argon controlled atmosphere. Fe-Mn alloy samples were boronized using the commercial Ekabor II powder at 900°C, 1000C and 1100C for 3 h. The borided samples were characterized by X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, and profilometry. The boride layers were composed of FeB, MnB, MnB_2 and Fe_2B phases for the samples borided at 1000C and 1100C while the sample borided at 900C was composed of only FeB and MnB. The boride layer was well adhered to the substrate with saw-tooth like morphology however some discontinuous band of cracks were observed in the boride layer. The concentration ratio of Fe and Mn were equal along the thickness of the coating though in some areas their ratio interchanged. The boride layer thickness and surface roughness increased with boronizing temperature.

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3 Acta Physica Polonica A

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3 Gencer Y.

3 Gunduz K.

3 Tarakci M.

2 Gulec A.

1 Azakli Y.

1 Calik A.

1 Oter Z.

A Comparative Study on Boride Layer Morphology of Fe-4Co, Fe-4V and Fe-4W Binary Alloys

Characterization of Ternary Mg-Sn-Mn Alloys

Boriding of Equiatomic Fe-Mn Binary Alloy