Nanoindentation studies and a alysis of the mechanical properties of Ti-Nb2O5 based composites
- Alaneme, Kenneth Kanayo, Fatokun, Ayoyemi Adebanji, Oke, Samuel Ranti, Olubambi, Peter Apata
- Authors: Alaneme, Kenneth Kanayo , Fatokun, Ayoyemi Adebanji , Oke, Samuel Ranti , Olubambi, Peter Apata
- Date: 2020
- Subjects: Titanium based composites , Niobium pentoxide , Nanoindentation
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/453348 , uj:40020 , Citation: Alaneme, K.K. et al. 2020. Nanoindentation studies and a alysis of the mechanical properties of Ti-Nb2O5 based composites. , DOI: https://doi.org/10.1051/mfreview/2020017
- Description: Abstract: In this study, nanoindentation tests were used to evaluate the mechanical properties of spark plasma sintered Ti based composites containing 5, 10 and 15 wt.% Nb2O5, targeted for potential use as biomedical material. Nanoindentation tests were performed on the samples using indenter loads of 20 and 100 mN, while the microstructures were characterized using scanning electron microscopy. It was noted that with increasing Nb2O5 wt.%, there is transition from the lamellar structure of pure Ti to fully bimodal structures for the Ti-10 wt.% Nb2O5 and Ti-15 wt.% Nb2O5 composites. The hardness (6.0–40.67 GPa (20 mN) and 2.4–12.03 GPa (100 mN)) and reduced elastic modulus (115–266.91 GPa (20 mN) and (28.05–96.873 GPa (100 mN)) of the composites increases with increase in the Nb2O5 content, attributed to contributions of load transfer from the Ti matrix to the relatively harder Nb2O5 particles, particle and dispersion strengthening mechanisms. The elastic recovery index also improved with increase in Nb2O5 content, while the inverse was noted with respect to plasticity index. The elastic strain to failure and yield pressure both improved with increase in Nb2O5 content, which suggests that the antiwear properties and resistance to impact loading equally improves with Nb2O5 addition.
- Full Text:
- Authors: Alaneme, Kenneth Kanayo , Fatokun, Ayoyemi Adebanji , Oke, Samuel Ranti , Olubambi, Peter Apata
- Date: 2020
- Subjects: Titanium based composites , Niobium pentoxide , Nanoindentation
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/453348 , uj:40020 , Citation: Alaneme, K.K. et al. 2020. Nanoindentation studies and a alysis of the mechanical properties of Ti-Nb2O5 based composites. , DOI: https://doi.org/10.1051/mfreview/2020017
- Description: Abstract: In this study, nanoindentation tests were used to evaluate the mechanical properties of spark plasma sintered Ti based composites containing 5, 10 and 15 wt.% Nb2O5, targeted for potential use as biomedical material. Nanoindentation tests were performed on the samples using indenter loads of 20 and 100 mN, while the microstructures were characterized using scanning electron microscopy. It was noted that with increasing Nb2O5 wt.%, there is transition from the lamellar structure of pure Ti to fully bimodal structures for the Ti-10 wt.% Nb2O5 and Ti-15 wt.% Nb2O5 composites. The hardness (6.0–40.67 GPa (20 mN) and 2.4–12.03 GPa (100 mN)) and reduced elastic modulus (115–266.91 GPa (20 mN) and (28.05–96.873 GPa (100 mN)) of the composites increases with increase in the Nb2O5 content, attributed to contributions of load transfer from the Ti matrix to the relatively harder Nb2O5 particles, particle and dispersion strengthening mechanisms. The elastic recovery index also improved with increase in Nb2O5 content, while the inverse was noted with respect to plasticity index. The elastic strain to failure and yield pressure both improved with increase in Nb2O5 content, which suggests that the antiwear properties and resistance to impact loading equally improves with Nb2O5 addition.
- Full Text:
Densification characteristics, microstructure and wear behaviour of spark plasma sintering processed titanium-niobium pentoxide (Ti-Nb2O5) based composites
- Alaneme, Kenneth Kanayo, Adu, Oluwaseun P., Oke, Samuel Ranti, Falodun, Oluwasegun Eso, Olubambi, Peter Apata
- Authors: Alaneme, Kenneth Kanayo , Adu, Oluwaseun P. , Oke, Samuel Ranti , Falodun, Oluwasegun Eso , Olubambi, Peter Apata
- Date: 2020
- Subjects: Metallic biomaterial , Ti based composite , Niobium pentoxide
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/457519 , uj:40601 , Citation: Kenneth Kanayo Alaneme, O.P. Adu, Samuel Ranti Oke et al., Densification characteristics, microstructure and wear behaviour of spark plasma sintering processed titanium-niobium pentoxide (Ti-Nb2O5) based composites, Journal of King Saud University – Engineering Sciences, https://doi.org/ 10.1016/j.jksues.2020.10.005
- Description: Abstract: Please refer to full text to view abstract.
- Full Text:
- Authors: Alaneme, Kenneth Kanayo , Adu, Oluwaseun P. , Oke, Samuel Ranti , Falodun, Oluwasegun Eso , Olubambi, Peter Apata
- Date: 2020
- Subjects: Metallic biomaterial , Ti based composite , Niobium pentoxide
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/457519 , uj:40601 , Citation: Kenneth Kanayo Alaneme, O.P. Adu, Samuel Ranti Oke et al., Densification characteristics, microstructure and wear behaviour of spark plasma sintering processed titanium-niobium pentoxide (Ti-Nb2O5) based composites, Journal of King Saud University – Engineering Sciences, https://doi.org/ 10.1016/j.jksues.2020.10.005
- Description: Abstract: Please refer to full text to view abstract.
- Full Text:
Nanoindentation studies and analysis of the mechanical properties of Ti-Nb2O5 based composites
- Alaneme, Kenneth Kanayo, Fatokun, Ayoyemi Adebanji, Oke, Samuel Ranti, Olubambi, Peter Apata
- Authors: Alaneme, Kenneth Kanayo , Fatokun, Ayoyemi Adebanji , Oke, Samuel Ranti , Olubambi, Peter Apata
- Date: 2020
- Subjects: Titanium based composites , Niobium pentoxide , Nanoindentation
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/464025 , uj:41433 , Citation: Alaneme, K.K. et al. 2020. Nanoindentation studies and analysis of the mechanical properties of Ti-Nb2O5 based composites. , DOI: https://doi.org/10.1051/mfreview/2020017
- Description: Abstract: Please refer to full text to view abstract.
- Full Text:
- Authors: Alaneme, Kenneth Kanayo , Fatokun, Ayoyemi Adebanji , Oke, Samuel Ranti , Olubambi, Peter Apata
- Date: 2020
- Subjects: Titanium based composites , Niobium pentoxide , Nanoindentation
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/464025 , uj:41433 , Citation: Alaneme, K.K. et al. 2020. Nanoindentation studies and analysis of the mechanical properties of Ti-Nb2O5 based composites. , DOI: https://doi.org/10.1051/mfreview/2020017
- Description: Abstract: Please refer to full text to view abstract.
- Full Text:
Influence of SiAlON ceramic reinforcement on Ti6Al4V alloy matrix via spark plasma sintering technique
- Falodun, Oluwasegun Eso, Oke, Samuel Ranti, Obadele, Babatunde Abiodun, Okoro, Avwerosuoghene Moses, Olubambi, Peter Apata
- Authors: Falodun, Oluwasegun Eso , Oke, Samuel Ranti , Obadele, Babatunde Abiodun , Okoro, Avwerosuoghene Moses , Olubambi, Peter Apata
- Date: 2019
- Subjects: Powder metallurgy , Ti6Al4V , SiAlON
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/406789 , uj:34215 , Citation: Falodun, O.E. et al. 2019 : Influence of SiAlON ceramic reinforcement on Ti6Al4V alloy matrix via spark plasma sintering technique. DOI: https://doi.org/10.1007/s12540-019-00553-3.
- Description: Abstract : The titanium-based composite was fabricated by strengthening Ti6Al4V alloy with addition of SiAlON ceramics utilizing spark plasma sintering technique. Ti6Al4V and SiAlON powders were mixed in a T2F Turbula mixer with different propor- tions (5, 10, 15 and 20 vol%) and the admixed powders were consolidated using spark plasma sintering to produce titanium matrix composites. The characterization of the sintered composites was performed using X-ray diffraction, optical microscopy and scanning electron microscopy. The influence of SiAlON additions on densification, microstructure, microhardness and fracture morphology were investigated on the sintered composites. The experimental results revealed that the densification of the sintered titanium matrix composites was in the range of 95%–98%, which decreased with an increase in SiAlON addition. However, an increase in microhardness values ranging from 363 to 574 HV0.1 was achieved. The microstructure shows that the SiAlON ceramic particle was uniformly distributed within the titanium matrix composites which comprises of a mixture of lamellar colonies with β grain boundaries. The fracture features of all composites exhibit mixed fracture of both intergranular and transgranular fracture mechanism.
- Full Text:
- Authors: Falodun, Oluwasegun Eso , Oke, Samuel Ranti , Obadele, Babatunde Abiodun , Okoro, Avwerosuoghene Moses , Olubambi, Peter Apata
- Date: 2019
- Subjects: Powder metallurgy , Ti6Al4V , SiAlON
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/406789 , uj:34215 , Citation: Falodun, O.E. et al. 2019 : Influence of SiAlON ceramic reinforcement on Ti6Al4V alloy matrix via spark plasma sintering technique. DOI: https://doi.org/10.1007/s12540-019-00553-3.
- Description: Abstract : The titanium-based composite was fabricated by strengthening Ti6Al4V alloy with addition of SiAlON ceramics utilizing spark plasma sintering technique. Ti6Al4V and SiAlON powders were mixed in a T2F Turbula mixer with different propor- tions (5, 10, 15 and 20 vol%) and the admixed powders were consolidated using spark plasma sintering to produce titanium matrix composites. The characterization of the sintered composites was performed using X-ray diffraction, optical microscopy and scanning electron microscopy. The influence of SiAlON additions on densification, microstructure, microhardness and fracture morphology were investigated on the sintered composites. The experimental results revealed that the densification of the sintered titanium matrix composites was in the range of 95%–98%, which decreased with an increase in SiAlON addition. However, an increase in microhardness values ranging from 363 to 574 HV0.1 was achieved. The microstructure shows that the SiAlON ceramic particle was uniformly distributed within the titanium matrix composites which comprises of a mixture of lamellar colonies with β grain boundaries. The fracture features of all composites exhibit mixed fracture of both intergranular and transgranular fracture mechanism.
- Full Text:
Synthesis and characterization of commercial pure titanium-nickel alloy behavior reinforced with titanium diboride
- Falodun, Oluwasegun Eso, Oke, Samuel Ranti, Olubambi, Peter Apata
- Authors: Falodun, Oluwasegun Eso , Oke, Samuel Ranti , Olubambi, Peter Apata
- Date: 2020
- Subjects: Titanium , Nickel , TiB2
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/458331 , uj:40705 , Falodun, O.E., Oke, S.R., Olubambi, P.A.: Synthesis and characterization of commercial pure titanium-nickel alloy behavior reinforced with titanium diboride.
- Description: Abstract: Commercial pure titanium alloy with Ni-TiB2 ceramic additions (5, 10, 15 and 20 vol.%) were synthesized through the spark plasma sintering approach with sintering temperature of 1000 oC, the heating rate of 100 oC/min, holding time of 5 min at a constant pressure of 50 MPa. The study investigated the effect of Ni-TiB2 on the densification, phase change, microhardness, microstructure, and wear properties of the sintered titanium-based composites. Results showed that Ti-Ni-TiB2 composites relative density ranges from 97 to 99 %, while microhardness values increase with addition of nickel and titanium diboride from 228 to 587 HV0.1. The microstructural evolution shows that pure titanium transformed from lamellar phase to equiaxed alpha phase upon addition of nickel alloy and further get refined with a distinct grain boundary comprises of titanium diboride around the boundaries. The average coefficient of friction for the titanium-based composite was higher for commercially pure titanium (0.73) while the addition of TiB2 exhibit (0.66, 0.63, 0.58, 0.55 and 0.46 respectively) improvement in the wear behavior.
- Full Text:
- Authors: Falodun, Oluwasegun Eso , Oke, Samuel Ranti , Olubambi, Peter Apata
- Date: 2020
- Subjects: Titanium , Nickel , TiB2
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/458331 , uj:40705 , Falodun, O.E., Oke, S.R., Olubambi, P.A.: Synthesis and characterization of commercial pure titanium-nickel alloy behavior reinforced with titanium diboride.
- Description: Abstract: Commercial pure titanium alloy with Ni-TiB2 ceramic additions (5, 10, 15 and 20 vol.%) were synthesized through the spark plasma sintering approach with sintering temperature of 1000 oC, the heating rate of 100 oC/min, holding time of 5 min at a constant pressure of 50 MPa. The study investigated the effect of Ni-TiB2 on the densification, phase change, microhardness, microstructure, and wear properties of the sintered titanium-based composites. Results showed that Ti-Ni-TiB2 composites relative density ranges from 97 to 99 %, while microhardness values increase with addition of nickel and titanium diboride from 228 to 587 HV0.1. The microstructural evolution shows that pure titanium transformed from lamellar phase to equiaxed alpha phase upon addition of nickel alloy and further get refined with a distinct grain boundary comprises of titanium diboride around the boundaries. The average coefficient of friction for the titanium-based composite was higher for commercially pure titanium (0.73) while the addition of TiB2 exhibit (0.66, 0.63, 0.58, 0.55 and 0.46 respectively) improvement in the wear behavior.
- Full Text:
Spark plasma sintering of duplex stainless steel reinforced with titanium nitride nanoparticles
- Authors: Oke, Samuel Ranti
- Date: 2019
- Subjects: Titanium-aluminum-vanadium alloys , Nanoparticles , Sintering
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/393783 , uj:32594
- Description: Abstract : In this study, duplex stainless steel (DSS) micro-powders and titanium nitride (TiN) nanopowders were blended in a tubular mixer. The motivation for choosing to incorporate TiN into duplex stainless steel is develop DSS with improved wear and mechanical properties. The Characterization of the mixed powders was performed using X-ray Diffraction, Transmission Electron Microscopy and Scanning Electron Microscopy. The mixed powders were consolidated using automated spark plasma sintering machine (model HHPD-25, FCT GmbH Germany). Characterization of sintered TiN nanoparticle reinforced DSS was performed using X-ray Diffraction (XRD) and Scanning Electron Microscopy equipped with Energy-dispersive X-ray spectroscopy (EDS), Electron backscattered diffractions (EBSD) and Transmission kikuchi diffraction (TKD). Densities and hardness of the developed composite were investigated. The mechanical properties and tribological properties of the DSS strengthened with varied amounts of TiN nanoparticles were evaluated using nanoindentation system and tribometers respectively. This study produced seven (7) papers, each of the paper respectively investigated (1) the past works that have been conducted on mechanical alloying and SPS of stainless steels and composites (2) the optimization of SPS process parameters in terms of in terms of sintering temperature, holding time and heating rate for the development of a nanostructured duplex stainless steel reinforced with titanium nitride (TiN), (3) the effect of sintering parameters (sintering temperature and holding time) on the microstructure, corrosion and wear behaviour of the nano-strutured stainless steel composite (4) the effects of TiN nanoparticles addition on displacement and shrinkage rate, microstructure, density, hardness and fracture surface of the duplex stainless steels composite (5) phase transformations and grain boundary interactions associated with the dispersion of TiN nanoparticles into DSS (6) the influence of TiN nanoparticle addition on mechanical properties such as elastic, plastic, strain-to-break (H/Er) and plastic deformation (H3 /Er2 ) parameters of the stainless steel composites (7) the effects of TiN reinforcement on wear properties of coefficient of friction, wear loss, wear and specific wear rates under dry sliding conditions and varying loads and worn surface. The following results were obtained. During optimization of SPS parameters, the XRD result showed the evolution of iron nitride phase while the EDS analysis revealed the presence of nano ranged nitride particles segregated at the grain boundaries of the duplex matrix. A decrease in hardness and densification was observed when sintering temperature and heating rate were 1200... , Ph.D. (Metallurgy)
- Full Text:
- Authors: Oke, Samuel Ranti
- Date: 2019
- Subjects: Titanium-aluminum-vanadium alloys , Nanoparticles , Sintering
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/393783 , uj:32594
- Description: Abstract : In this study, duplex stainless steel (DSS) micro-powders and titanium nitride (TiN) nanopowders were blended in a tubular mixer. The motivation for choosing to incorporate TiN into duplex stainless steel is develop DSS with improved wear and mechanical properties. The Characterization of the mixed powders was performed using X-ray Diffraction, Transmission Electron Microscopy and Scanning Electron Microscopy. The mixed powders were consolidated using automated spark plasma sintering machine (model HHPD-25, FCT GmbH Germany). Characterization of sintered TiN nanoparticle reinforced DSS was performed using X-ray Diffraction (XRD) and Scanning Electron Microscopy equipped with Energy-dispersive X-ray spectroscopy (EDS), Electron backscattered diffractions (EBSD) and Transmission kikuchi diffraction (TKD). Densities and hardness of the developed composite were investigated. The mechanical properties and tribological properties of the DSS strengthened with varied amounts of TiN nanoparticles were evaluated using nanoindentation system and tribometers respectively. This study produced seven (7) papers, each of the paper respectively investigated (1) the past works that have been conducted on mechanical alloying and SPS of stainless steels and composites (2) the optimization of SPS process parameters in terms of in terms of sintering temperature, holding time and heating rate for the development of a nanostructured duplex stainless steel reinforced with titanium nitride (TiN), (3) the effect of sintering parameters (sintering temperature and holding time) on the microstructure, corrosion and wear behaviour of the nano-strutured stainless steel composite (4) the effects of TiN nanoparticles addition on displacement and shrinkage rate, microstructure, density, hardness and fracture surface of the duplex stainless steels composite (5) phase transformations and grain boundary interactions associated with the dispersion of TiN nanoparticles into DSS (6) the influence of TiN nanoparticle addition on mechanical properties such as elastic, plastic, strain-to-break (H/Er) and plastic deformation (H3 /Er2 ) parameters of the stainless steel composites (7) the effects of TiN reinforcement on wear properties of coefficient of friction, wear loss, wear and specific wear rates under dry sliding conditions and varying loads and worn surface. The following results were obtained. During optimization of SPS parameters, the XRD result showed the evolution of iron nitride phase while the EDS analysis revealed the presence of nano ranged nitride particles segregated at the grain boundaries of the duplex matrix. A decrease in hardness and densification was observed when sintering temperature and heating rate were 1200... , Ph.D. (Metallurgy)
- Full Text:
Influence of aluminium content on the microstructure and densification of spark plasma sintered nickel aluminium bronze
- Okoro, Avwerosuoghene Moses, Lephuthing, Senzeni Sipho, Oke, Samuel Ranti, Olubambi, Peter Apata
- Authors: Okoro, Avwerosuoghene Moses , Lephuthing, Senzeni Sipho , Oke, Samuel Ranti , Olubambi, Peter Apata
- Date: 2021
- Subjects: Spark plasma sintering , Nickel aluminium bronze , Microstructure
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/480910 , uj:43551 , Citation: Okoro, A.M. et al. 2021. Influence of aluminium content on the microstructure and densification of spark plasma sintered nickel aluminium bronze. DOI: https://doi.org/10.1051/mfreview/2021006
- Description: Abstract: In this study, nickel aluminium bronze alloys (NAB) with appreciable densification and improved microhardness was consolidated via spark plasma sintering technique. The NAB alloy was synthesized from starting elemental powders comprised nickel (4 wt.%), aluminium (6, 8 & 10 wt.%) and copper using dry milling technique. Starting powders were homogeneously milled using gentle ball mill for 8 h at a speed of 150 rpm and a BPR of 10:1. Subsequently, the milled powders were consolidated using the spark plasma sintering technique at 750 °C under a compressive pressure of 50MPa and rate of heating (100 °C/min). Furthermore, the powders and sintered alloys were characterized using SEM and XRD to ascertain the microstructural and phase evolutions during the synthesis of the NAB. The density and microhardness of the alloys were further investigated to ascertain the integrity of the sintered alloys. The results indicated that the increase in aluminium content resulted in the formation of intermetallic and beta phases on the alloy after sintering and the microhardness of the alloys improved with the increase in aluminium content.
- Full Text:
- Authors: Okoro, Avwerosuoghene Moses , Lephuthing, Senzeni Sipho , Oke, Samuel Ranti , Olubambi, Peter Apata
- Date: 2021
- Subjects: Spark plasma sintering , Nickel aluminium bronze , Microstructure
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/480910 , uj:43551 , Citation: Okoro, A.M. et al. 2021. Influence of aluminium content on the microstructure and densification of spark plasma sintered nickel aluminium bronze. DOI: https://doi.org/10.1051/mfreview/2021006
- Description: Abstract: In this study, nickel aluminium bronze alloys (NAB) with appreciable densification and improved microhardness was consolidated via spark plasma sintering technique. The NAB alloy was synthesized from starting elemental powders comprised nickel (4 wt.%), aluminium (6, 8 & 10 wt.%) and copper using dry milling technique. Starting powders were homogeneously milled using gentle ball mill for 8 h at a speed of 150 rpm and a BPR of 10:1. Subsequently, the milled powders were consolidated using the spark plasma sintering technique at 750 °C under a compressive pressure of 50MPa and rate of heating (100 °C/min). Furthermore, the powders and sintered alloys were characterized using SEM and XRD to ascertain the microstructural and phase evolutions during the synthesis of the NAB. The density and microhardness of the alloys were further investigated to ascertain the integrity of the sintered alloys. The results indicated that the increase in aluminium content resulted in the formation of intermetallic and beta phases on the alloy after sintering and the microhardness of the alloys improved with the increase in aluminium content.
- Full Text:
- «
- ‹
- 1
- ›
- »