Fe-Ti(O,N) composites produced from mechanically alloyed powders

J. M. Herrera-Ramírez, J. G. Cabañas-Moreno, O. Coreño-Alonso, F. Cruz-Gandarilla, K. Tsuchiya, M. Umemoto, R. Guardián

Research output: Contribution to conferencePaper

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Abstract

Spark plasma sintering of mechanically alloyed powders was used to obtain Fe-Ti(O,N) microcomposites, with nominal contents of 25 and 40 vol% of the ceramic phase. Sintering temperatures up to 900°C together with a pressure of 50 MPa were used in the a sintering process, resulting in densification levels of about 91%. The microstructure of the sintered microcomposites was characterized by x-ray diffraction, scanning electron microscopy, transmission electron microscopy and microanalysis techniques; additionally, Young's modulus, flexural strength and microhardness were also determined. In the bulk of sintered specimens, a dispersion of nanometric Ti(O,N) particles within alpha-iron grains was observed. A surface layer containing cementite was also found on the surfaces of specimens sintered at 900°C. As a result of this, a hardness of about 715-765 kg/mm2was measured on the specimen surface, while the value determined in the bulk was between 540 and 580 kg/mm2. The calculated values of Young's modulus were close to estimates made by the law of mixtures and proper consideration of the residual porosity. On the other hand, despite the similarities in microstructures and other characteristics (densification, hardness, Young's modulus) in specimens of nominally different ceramic content, the measured flexural strength changed from about 765 MPa for Fe-25vol%Ti(O,N) to about 225 MPa for Fe-40vol%Ti(O,N) composites. The surface layer rich in cementite increased the hardness and toughness of the composites.
Original languageAmerican English
Pages267-274
Number of pages239
DOIs
StatePublished - 1 Jan 2003
EventJournal of Metastable and Nanocrystalline Materials -
Duration: 1 Jan 2004 → …

Conference

ConferenceJournal of Metastable and Nanocrystalline Materials
Period1/01/04 → …

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Elastic Modulus
Hardness
Powders
Ceramics
Transmission Electron Microscopy
Alpha Particles
Porosity
Electron Scanning Microscopy
Iron
X-Rays
Pressure
Temperature

Cite this

Herrera-Ramírez, J. M., Cabañas-Moreno, J. G., Coreño-Alonso, O., Cruz-Gandarilla, F., Tsuchiya, K., Umemoto, M., & Guardián, R. (2003). Fe-Ti(O,N) composites produced from mechanically alloyed powders. 267-274. Paper presented at Journal of Metastable and Nanocrystalline Materials, . https://doi.org/10.4028/www.scientific.net/JMNM.15-16.267
Herrera-Ramírez, J. M. ; Cabañas-Moreno, J. G. ; Coreño-Alonso, O. ; Cruz-Gandarilla, F. ; Tsuchiya, K. ; Umemoto, M. ; Guardián, R. / Fe-Ti(O,N) composites produced from mechanically alloyed powders. Paper presented at Journal of Metastable and Nanocrystalline Materials, .239 p.
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Herrera-Ramírez, JM, Cabañas-Moreno, JG, Coreño-Alonso, O, Cruz-Gandarilla, F, Tsuchiya, K, Umemoto, M & Guardián, R 2003, 'Fe-Ti(O,N) composites produced from mechanically alloyed powders', Paper presented at Journal of Metastable and Nanocrystalline Materials, 1/01/04 pp. 267-274. https://doi.org/10.4028/www.scientific.net/JMNM.15-16.267

Fe-Ti(O,N) composites produced from mechanically alloyed powders. / Herrera-Ramírez, J. M.; Cabañas-Moreno, J. G.; Coreño-Alonso, O.; Cruz-Gandarilla, F.; Tsuchiya, K.; Umemoto, M.; Guardián, R.

2003. 267-274 Paper presented at Journal of Metastable and Nanocrystalline Materials, .

Research output: Contribution to conferencePaper

TY - CONF

T1 - Fe-Ti(O,N) composites produced from mechanically alloyed powders

AU - Herrera-Ramírez, J. M.

AU - Cabañas-Moreno, J. G.

AU - Coreño-Alonso, O.

AU - Cruz-Gandarilla, F.

AU - Tsuchiya, K.

AU - Umemoto, M.

AU - Guardián, R.

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N2 - Spark plasma sintering of mechanically alloyed powders was used to obtain Fe-Ti(O,N) microcomposites, with nominal contents of 25 and 40 vol% of the ceramic phase. Sintering temperatures up to 900°C together with a pressure of 50 MPa were used in the a sintering process, resulting in densification levels of about 91%. The microstructure of the sintered microcomposites was characterized by x-ray diffraction, scanning electron microscopy, transmission electron microscopy and microanalysis techniques; additionally, Young's modulus, flexural strength and microhardness were also determined. In the bulk of sintered specimens, a dispersion of nanometric Ti(O,N) particles within alpha-iron grains was observed. A surface layer containing cementite was also found on the surfaces of specimens sintered at 900°C. As a result of this, a hardness of about 715-765 kg/mm2was measured on the specimen surface, while the value determined in the bulk was between 540 and 580 kg/mm2. The calculated values of Young's modulus were close to estimates made by the law of mixtures and proper consideration of the residual porosity. On the other hand, despite the similarities in microstructures and other characteristics (densification, hardness, Young's modulus) in specimens of nominally different ceramic content, the measured flexural strength changed from about 765 MPa for Fe-25vol%Ti(O,N) to about 225 MPa for Fe-40vol%Ti(O,N) composites. The surface layer rich in cementite increased the hardness and toughness of the composites.

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Herrera-Ramírez JM, Cabañas-Moreno JG, Coreño-Alonso O, Cruz-Gandarilla F, Tsuchiya K, Umemoto M et al. Fe-Ti(O,N) composites produced from mechanically alloyed powders. 2003. Paper presented at Journal of Metastable and Nanocrystalline Materials, . https://doi.org/10.4028/www.scientific.net/JMNM.15-16.267