The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Savko Malinov - One of the best experts on this subject based on the ideXlab platform.
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titanium Alloys after surface gas nitriding
Surface & Coatings Technology, 2006Co-Authors: A. Zhecheva, Savko MalinovAbstract:Abstract Experimental studies using differential scanning calorimetry (DSC) for nitriding of four titanium-Alloys near α Ti–8Al–1Mo–1V, near α Ti–6Al–2Sn–4Zr–2Mo, α + β Ti–6Al–4V and near β Ti–10V–2Fe–3Al at different temperatures and for different periods of time are presented. The X-ray diffraction (XRD) technique was used in order to study the phase transformations that occur during gas nitriding. As a result of the nitrogen interaction, a nitrided layer was formed that consists of titanium nitrides, followed by an interstitial solution of nitrogen in the hcp α titanium phase. The microstructural changes of these Alloys in relation to the Alloy Composition and processing parameters were studied. It was found that the microstructure of Alloys nitrided at temperatures below their β transus temperatures for various periods of time is uniform and homogeneous. With the increase of the temperature above their β transus temperatures the microstructure changes to irregular. Microindentation hardness testing using a Knoop indenter was conducted on the nitrided titanium Alloys to analyse their hardness evolution in relation to the nitriding processing parameters and Alloy Composition. It was found that the microhardness increases with the increase of the temperature and time of nitriding. The surface morphology of the Ti–6Al–2Sn–4Zr–2Mo Alloy in relation to the nitriding processing parameters was analysed.
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titanium Alloys after surface gas nitriding
Surface & Coatings Technology, 2006Co-Authors: A. Zhecheva, Savko MalinovAbstract:Abstract Experimental studies using differential scanning calorimetry (DSC) for nitriding of four titanium-Alloys near α Ti–8Al–1Mo–1V, near α Ti–6Al–2Sn–4Zr–2Mo, α + β Ti–6Al–4V and near β Ti–10V–2Fe–3Al at different temperatures and for different periods of time are presented. The X-ray diffraction (XRD) technique was used in order to study the phase transformations that occur during gas nitriding. As a result of the nitrogen interaction, a nitrided layer was formed that consists of titanium nitrides, followed by an interstitial solution of nitrogen in the hcp α titanium phase. The microstructural changes of these Alloys in relation to the Alloy Composition and processing parameters were studied. It was found that the microstructure of Alloys nitrided at temperatures below their β transus temperatures for various periods of time is uniform and homogeneous. With the increase of the temperature above their β transus temperatures the microstructure changes to irregular. Microindentation hardness testing using a Knoop indenter was conducted on the nitrided titanium Alloys to analyse their hardness evolution in relation to the nitriding processing parameters and Alloy Composition. It was found that the microhardness increases with the increase of the temperature and time of nitriding. The surface morphology of the Ti–6Al–2Sn–4Zr–2Mo Alloy in relation to the nitriding processing parameters was analysed.
Carolin Körner - One of the best experts on this subject based on the ideXlab platform.
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processing window and evaporation phenomena for ti 6al 4v produced by selective electron beam melting
Acta Materialia, 2014Co-Authors: Vera Juechter, Thorsten Scharowsky, Robert F Singer, Carolin KörnerAbstract:Abstract Additive manufacturing by selective electron beam melting is a promising way to fabricate complex Ti–6Al–4V components. Sound parts can be realized by applying quite different processing strategies, which have an influence not only on processing time but also on the microstructure and the Alloy Composition. In this work, the processing window for Ti–6Al–4V is determined for a wide range of scanning speeds and line energies. The influence of the energy input on the resulting heat-affected zone and Alloy Composition is discussed.
A. Zhecheva - One of the best experts on this subject based on the ideXlab platform.
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titanium Alloys after surface gas nitriding
Surface & Coatings Technology, 2006Co-Authors: A. Zhecheva, Savko MalinovAbstract:Abstract Experimental studies using differential scanning calorimetry (DSC) for nitriding of four titanium-Alloys near α Ti–8Al–1Mo–1V, near α Ti–6Al–2Sn–4Zr–2Mo, α + β Ti–6Al–4V and near β Ti–10V–2Fe–3Al at different temperatures and for different periods of time are presented. The X-ray diffraction (XRD) technique was used in order to study the phase transformations that occur during gas nitriding. As a result of the nitrogen interaction, a nitrided layer was formed that consists of titanium nitrides, followed by an interstitial solution of nitrogen in the hcp α titanium phase. The microstructural changes of these Alloys in relation to the Alloy Composition and processing parameters were studied. It was found that the microstructure of Alloys nitrided at temperatures below their β transus temperatures for various periods of time is uniform and homogeneous. With the increase of the temperature above their β transus temperatures the microstructure changes to irregular. Microindentation hardness testing using a Knoop indenter was conducted on the nitrided titanium Alloys to analyse their hardness evolution in relation to the nitriding processing parameters and Alloy Composition. It was found that the microhardness increases with the increase of the temperature and time of nitriding. The surface morphology of the Ti–6Al–2Sn–4Zr–2Mo Alloy in relation to the nitriding processing parameters was analysed.
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titanium Alloys after surface gas nitriding
Surface & Coatings Technology, 2006Co-Authors: A. Zhecheva, Savko MalinovAbstract:Abstract Experimental studies using differential scanning calorimetry (DSC) for nitriding of four titanium-Alloys near α Ti–8Al–1Mo–1V, near α Ti–6Al–2Sn–4Zr–2Mo, α + β Ti–6Al–4V and near β Ti–10V–2Fe–3Al at different temperatures and for different periods of time are presented. The X-ray diffraction (XRD) technique was used in order to study the phase transformations that occur during gas nitriding. As a result of the nitrogen interaction, a nitrided layer was formed that consists of titanium nitrides, followed by an interstitial solution of nitrogen in the hcp α titanium phase. The microstructural changes of these Alloys in relation to the Alloy Composition and processing parameters were studied. It was found that the microstructure of Alloys nitrided at temperatures below their β transus temperatures for various periods of time is uniform and homogeneous. With the increase of the temperature above their β transus temperatures the microstructure changes to irregular. Microindentation hardness testing using a Knoop indenter was conducted on the nitrided titanium Alloys to analyse their hardness evolution in relation to the nitriding processing parameters and Alloy Composition. It was found that the microhardness increases with the increase of the temperature and time of nitriding. The surface morphology of the Ti–6Al–2Sn–4Zr–2Mo Alloy in relation to the nitriding processing parameters was analysed.
Vera Juechter - One of the best experts on this subject based on the ideXlab platform.
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processing window and evaporation phenomena for ti 6al 4v produced by selective electron beam melting
Acta Materialia, 2014Co-Authors: Vera Juechter, Thorsten Scharowsky, Robert F Singer, Carolin KörnerAbstract:Abstract Additive manufacturing by selective electron beam melting is a promising way to fabricate complex Ti–6Al–4V components. Sound parts can be realized by applying quite different processing strategies, which have an influence not only on processing time but also on the microstructure and the Alloy Composition. In this work, the processing window for Ti–6Al–4V is determined for a wide range of scanning speeds and line energies. The influence of the energy input on the resulting heat-affected zone and Alloy Composition is discussed.
Filip Tuomisto - One of the best experts on this subject based on the ideXlab platform.
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effects of Alloy Composition and si doping on vacancy defect formation in inxga1 x 2o3 thin films
Journal of Applied Physics, 2018Co-Authors: V Prozheeva, R Holldobler, H Von Wenckstern, M Grundmann, Filip TuomistoAbstract:Various nominally undoped and Si-doped (InxGa1–x)2O3 thin films were grown by pulsed laser deposition in a continuous Composition spread mode on c-plane α-sapphire and (100)-oriented MgO substrates. Positron annihilation spectroscopy in the Doppler broadening mode was used as the primary characterisation technique in order to investigate the effect of Alloy Composition and dopant atoms on the formation of vacancy-type defects. In the undoped samples, we observe a Ga2O3-like trend for low indium concentrations changing to In2O3-like behaviour along with the increase in the indium fraction. Increasing indium concentration is found to suppress defect formation in the undoped samples at [In] > 70 at. %. Si doping leads to positron saturation trapping in VIn-like defects, suggesting a vacancy concentration of at least mid-1018 cm−3 independent of the indium content.Various nominally undoped and Si-doped (InxGa1–x)2O3 thin films were grown by pulsed laser deposition in a continuous Composition spread mode on c-plane α-sapphire and (100)-oriented MgO substrates. Positron annihilation spectroscopy in the Doppler broadening mode was used as the primary characterisation technique in order to investigate the effect of Alloy Composition and dopant atoms on the formation of vacancy-type defects. In the undoped samples, we observe a Ga2O3-like trend for low indium concentrations changing to In2O3-like behaviour along with the increase in the indium fraction. Increasing indium concentration is found to suppress defect formation in the undoped samples at [In] > 70 at. %. Si doping leads to positron saturation trapping in VIn-like defects, suggesting a vacancy concentration of at least mid-1018 cm−3 independent of the indium content.