Microstructure and mechanical characterization of in situ synthesized AA6061/(TiB2+Al2O3) hybrid aluminum matrix composites
- Selvam, J. David Raja, Dinaharan, I., Vibin Philip, S., Mashinini, P. M.
- Authors: Selvam, J. David Raja , Dinaharan, I. , Vibin Philip, S. , Mashinini, P. M.
- Date: 2018
- Subjects: Aluminum matrix composites , Casting , Microstructure
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/273033 , uj:29080 , Citation: Selvam, J.D.R., Dinaharan, I., Vibin Philip, S. & Mashinini, P. M. 2018. Microstructure and mechanical characterization of in situ synthesized AA6061/(TiB2+Al2O3) hybrid aluminum matrix composites.
- Description: Abstract: TiB2 and Al2O3 particulates reinforced AA6061 aluminum matrix composites (AMCs) were synthesized by in-situ reaction of titanium (Ti) and boric acid (H3BO3) powders with molten aluminum. AMCs were fabricated using an electric stir casting furnace under a controlled environment. Heat flow curves of differential thermal analysis (DTA) showed that the synthesis temperature for the formation of TiB2 and Al2O3 using Al-Ti-H3BO3 reaction system was 950°C. The in-situ synthesized composites were characterized using XRD, FESEM, TEM and EBSD. XRD results revealed the formation of TiB2 and Al2O3 particulates in the composite. FESEM micrographs revealed a homogenous distribution of both the particulates with good interfacial bonding. EBSD maps showed that the in-situ formed TiB2 and Al2O3 particulates refined the grains of the aluminum matrix from 103 μm at 0 wt.% to 14 μm at 15 wt.%. Al2O3 particles exhibited spherical shape while TiB2 particles displayed hexagonal and cubic shapes. The formation of ultrafine and nano scale thermodynamically stable TiB2 and Al2O3 particles enhanced the microhardness and the tensile strength of the 2 AMCs. The microhardness and the tensile strength were respectively 122 HV and 287 MPa at 15 wt.%.
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- Authors: Selvam, J. David Raja , Dinaharan, I. , Vibin Philip, S. , Mashinini, P. M.
- Date: 2018
- Subjects: Aluminum matrix composites , Casting , Microstructure
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/273033 , uj:29080 , Citation: Selvam, J.D.R., Dinaharan, I., Vibin Philip, S. & Mashinini, P. M. 2018. Microstructure and mechanical characterization of in situ synthesized AA6061/(TiB2+Al2O3) hybrid aluminum matrix composites.
- Description: Abstract: TiB2 and Al2O3 particulates reinforced AA6061 aluminum matrix composites (AMCs) were synthesized by in-situ reaction of titanium (Ti) and boric acid (H3BO3) powders with molten aluminum. AMCs were fabricated using an electric stir casting furnace under a controlled environment. Heat flow curves of differential thermal analysis (DTA) showed that the synthesis temperature for the formation of TiB2 and Al2O3 using Al-Ti-H3BO3 reaction system was 950°C. The in-situ synthesized composites were characterized using XRD, FESEM, TEM and EBSD. XRD results revealed the formation of TiB2 and Al2O3 particulates in the composite. FESEM micrographs revealed a homogenous distribution of both the particulates with good interfacial bonding. EBSD maps showed that the in-situ formed TiB2 and Al2O3 particulates refined the grains of the aluminum matrix from 103 μm at 0 wt.% to 14 μm at 15 wt.%. Al2O3 particles exhibited spherical shape while TiB2 particles displayed hexagonal and cubic shapes. The formation of ultrafine and nano scale thermodynamically stable TiB2 and Al2O3 particles enhanced the microhardness and the tensile strength of the 2 AMCs. The microhardness and the tensile strength were respectively 122 HV and 287 MPa at 15 wt.%.
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Microstructure and wear characterization of aluminum matrix composites reinforced with industrial waste fly ash particulates synthesized by friction stir processing
- Dinaharan, I., Nelson, R., Vijay, S. J., Akinlabi, Esther Titilayo
- Authors: Dinaharan, I. , Nelson, R. , Vijay, S. J. , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Aluminum matrix composites , Friction stir processing , Fly ash , Wear
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/93234 , uj:20321 , Citation: Dinaharan, I. et al. 2016. Microstructure and wear characterization of aluminum matrix composites reinforced with industrial waste fly ash particulates synthesized by friction stir processing.
- Description: Abstract: Fly ash (FA) is a waste product of coal combustion in thermal power plants which is available in massive quantities all over the world causing land pollution. This paper reports the characterization of AA6061 aluminum matrix composites (AMCs) reinforced with FA particles synthesized using friction stir processing (FSP). The volume fraction of FA particles was varied from 0 to 18 in steps of 6. The prepared AMCs were characterized using optical microscopy (OM), scanning electron microscopy (SEM) and electron backscattered diagram (EBSD). The wear rate was estimated using a pin-on-disc wear apparatus. FA particles were observed to be distributed homogeneously in the AMC irrespective of the location within the stir zone. The EBSD micrographs revealed remarkable grain refinement in the AMC. The 2 incorporation of FA particles enhanced the microhardness and wear resistance of the AMC. The strengthening mechanisms of the AMC were discussed and correlated to the observed microstructures. The wear mechanisms were identified by characterizing the wear debris and worn surfaces.
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- Authors: Dinaharan, I. , Nelson, R. , Vijay, S. J. , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Aluminum matrix composites , Friction stir processing , Fly ash , Wear
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/93234 , uj:20321 , Citation: Dinaharan, I. et al. 2016. Microstructure and wear characterization of aluminum matrix composites reinforced with industrial waste fly ash particulates synthesized by friction stir processing.
- Description: Abstract: Fly ash (FA) is a waste product of coal combustion in thermal power plants which is available in massive quantities all over the world causing land pollution. This paper reports the characterization of AA6061 aluminum matrix composites (AMCs) reinforced with FA particles synthesized using friction stir processing (FSP). The volume fraction of FA particles was varied from 0 to 18 in steps of 6. The prepared AMCs were characterized using optical microscopy (OM), scanning electron microscopy (SEM) and electron backscattered diagram (EBSD). The wear rate was estimated using a pin-on-disc wear apparatus. FA particles were observed to be distributed homogeneously in the AMC irrespective of the location within the stir zone. The EBSD micrographs revealed remarkable grain refinement in the AMC. The 2 incorporation of FA particles enhanced the microhardness and wear resistance of the AMC. The strengthening mechanisms of the AMC were discussed and correlated to the observed microstructures. The wear mechanisms were identified by characterizing the wear debris and worn surfaces.
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Predicting the influence of process parameters on tensile strength of AA6061/TiC aluminum matrix composites produced using stir casting
- Moses, J. Jebeen, Dinaharan, I., Sekhar, S. Joseph
- Authors: Moses, J. Jebeen , Dinaharan, I. , Sekhar, S. Joseph
- Date: 2016
- Subjects: Aluminum matrix composites , Stir casting , Titanium carbide , Tensile strength
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/93246 , uj:20322 , Citation: Moses, J. J., Dinaharan, I. & Sekhar, S. J. 2016. Predicting the influence of process parameters on tensile strength of AA6061/TiC aluminum matrix composites produced using stir casting.
- Description: Abstract: Stir casting is an economical method to produce aluminum matrix composites (AMCs). In this work, stir casting was used to produce AA6061/15wt. % TiC AMCs. An empirical relationship was developed to predict the effect of stir casting parameters on the ultimate tensile strength (UTS) of AA6061/TiC AMCs. A central composite rotatable design consisting of four factors and five levels was used to minimize the number of experiments i.e. castings. The factors considered were stirrer speed, stirring time, blade angle and casting temperature. The effect of those factors on the UTS of AA6061/TiC AMCs was derived using the developed empirical relationship and elucidated using microstructural characterization. Each factor significantly influenced the UTS. A higher or lower values of those factors resulted in poor tensile strength. The variation in the UTS was attributed to porosity content, cluster formation, segregation of TiC particles at the grain boundaries and 2 homogenous distribution in the aluminum matrix. The UTS was high when the porosity content was low and the distribution was homogenous. The present work concludes that a careful selection and control of stir casting parameters are necessary to reduce porosity content and obtain uniform distribution to improve the load bearing capacity of the AA6061/TiC AMCs.
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- Authors: Moses, J. Jebeen , Dinaharan, I. , Sekhar, S. Joseph
- Date: 2016
- Subjects: Aluminum matrix composites , Stir casting , Titanium carbide , Tensile strength
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/93246 , uj:20322 , Citation: Moses, J. J., Dinaharan, I. & Sekhar, S. J. 2016. Predicting the influence of process parameters on tensile strength of AA6061/TiC aluminum matrix composites produced using stir casting.
- Description: Abstract: Stir casting is an economical method to produce aluminum matrix composites (AMCs). In this work, stir casting was used to produce AA6061/15wt. % TiC AMCs. An empirical relationship was developed to predict the effect of stir casting parameters on the ultimate tensile strength (UTS) of AA6061/TiC AMCs. A central composite rotatable design consisting of four factors and five levels was used to minimize the number of experiments i.e. castings. The factors considered were stirrer speed, stirring time, blade angle and casting temperature. The effect of those factors on the UTS of AA6061/TiC AMCs was derived using the developed empirical relationship and elucidated using microstructural characterization. Each factor significantly influenced the UTS. A higher or lower values of those factors resulted in poor tensile strength. The variation in the UTS was attributed to porosity content, cluster formation, segregation of TiC particles at the grain boundaries and 2 homogenous distribution in the aluminum matrix. The UTS was high when the porosity content was low and the distribution was homogenous. The present work concludes that a careful selection and control of stir casting parameters are necessary to reduce porosity content and obtain uniform distribution to improve the load bearing capacity of the AA6061/TiC AMCs.
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