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Characterization of CoTi Intermetallic Materials Produced by Electric Current Activated Sintering

100%
Ergin N., Ozdemir O.
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vol. 125
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issue 2
399-401
EN
In the present work, the characterization and production of CoTi intermetallic materials produced by electric current activated sintering under 300 MPa uniaxial pressure in open air at 2000 A for 6 min was investigated. Cobalt powder with 10 μm size and titanium powder < 40 μm size having 99.9% and 99.5% purity, respectively, were used. The elemental powders were mixed in the stoichiometric ratio corresponding to the CoTi intermetallic, in a molar proportion of 1:1. Scanning electron microscopy and X-ray diffraction analysis were used to characterize produced samples. In microstructural examinations it was found that the sample has multi-phase microstructure. X-ray diffraction studies revealed that the phases are CoTi, CoTi_2, TiCo_2, and CoTiO_3. The relative density of test materials measured according to Archimedes' principle was 87.6%, and the microhardness of materials was about 646.74 HV_{0.1}.
2
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An Investigation on TiNi Intermetallic Produced by Electric Current Activated Sintering

100%
Ergin N., Ozdemir O.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
248-249
EN
In this study, TiNi intermetallic compounds were produced by electric current activated sintering in open air under an uniaxial pressure of 200 MPa at a maximum of 1200 A for 10 min using Ni powder (99.8% purity, 4-7 μm), Ti powder (99.5% purity, less than 44 μm). The elemental powders were mixed in the stoichiometric ratio corresponding to the TiNi intermetallic at molar proportion of 1:1. Scanning electron microscopy and X-ray diffraction analysis were used to characterize produced samples. X-ray diffraction studies revealed that the dominant phases are TiNi, NiTi_2, Ni_3Ti, TiO, and Ni_2Ti_3. Scanning electron microscopy examinations showed a dense microstructure with very low amount of porosity. The relative density of test materials measured according to Archimedes' principle was 96.8%, and the microhardness of materials was about 773.6 ± 123 HV_{0.05}.
3
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Characterization of TiAl-Be Alloys Produced by Electric Current Activated Sintering

100%
Ergin N., Ozdemir O.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1103-1105
EN
In this study, TiAl-Be intermetallic alloys were produced by electric current-activated sintering (ECAS) method in open air under the uniaxial pressure of 200 MPa at a current of 1100-1200 A, applied for 2 minutes. Aluminum powder with 15 μm size (99%), titanium powder with less than 45 μm size (99.5%) and beryllium powder with size less than 44 μm size (99%) were used in order to produce the samples. The elemental powders were mixed in the stoichiometric ratio of 1:1, corresponding to molar proportion of TiAl intermetallic phases, and then the mixed powders were synthesized. While three phases were found in the TiAl samples after the microstructural examination, multi-phases were observed in the TiAl-5 wt.% Be samples. XRD studies revealed that the TiAl intermetallic alloys include TiAl, Ti₃Al and TiAl₃ phases. In addition to these three phases, Be₂Ti phase was also found in the TiAl-5 wt.% Be alloys. The relative densities of the TiAl and TiAl-5 wt.% Be samples, measured according to Archimedes' principle, were approximately 96.4% and 94.5%. Micro-hardness of TiAl and TiAl-5 wt.% Be samples was approximately 426± 34 and 478± 62 HV_{0.1}, respectively.
4
Content available remote

Characterization of Ni_3Al and Ti_3Al Coatings Produced by Electric Current Activated Sintering Method

81%
Ergin N., Yoruk G., Ozdemir O.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
245-247
EN
The present study reports on Ni_3Al and Ti_3Al-based intermetallics coated on AISI 1010 steel substrate by one-step pressure assisted electric current activated sintering method. Ni, Ti, and Al elemental powders were mixed in the stoichiometric ratio corresponding to the Ni_3Al and Ti_3Al intermetallics at molar proportion of 3:1. The mixed coating powders were placed onto the steel substrate in a mold, and pressed with compressive stress of 100 MPa and then, electric current: 1100-1200 A, voltage 2.9-3.4 V was applied for 15 min during coating. As-synthesized coatings seem to have good adherence with many small porosities. The phases formed in the Ni_3Al coating layer were Ni_3Al as a major phase beside NiO and NiAl_2O_4 trace phases, which were confirmed by X-ray diffraction analysis. However, TiAl and Ti trace phases besides major Ti_3Al phase were detected in the Ti_3Al coating. The hardness of the Ni_3Al, Ti_3Al coatings and AISI 1010 substrate was approximately 321 ± 18, 445 ± 13 and 157 HV_{0.5}, respectively.
5
Content available remote

Synthesis of Inconel 718 Superalloy by Electric Current Activated Sintering

71%
Ergin N., Ozdemir O., Demirkiran S., Sen S., Sen U.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1100-1102
EN
In the present study, the production of Inconel 718 nickel based superalloy was carried out in an electric current activated sintering in open air under a uniaxial pressure of 300 MPa using Al, Ni, Fe, Cr, Ti, Co, Fe-Nb and Fe-Mo powders. This alloy was heat treated, following the conventional treatment which consists of a 1 h solution treated at 980°C, followed by air cooling and double ageing, 8 h at 720°C, furnace cooling at 55°C/h down to 620°C and ageing for 8 h. Optical and SEM examinations showed a dense microstructure with low amount of porosity. XRD studies showed the existence of the γ and MC type carbide (M atom is a Nb, Ti combination) and δ phases. The relative density of sample measured according to Archimedes' principle was 93.7%, and the microhardness of sample was about 343.8 HV_{0.1}.
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