Influence of multi-pass friction stir processing on microstructure and mechanical properties of die cast Al-7Si-3Cu aluminium alloy
- Baruch, L. John, Raju, R., Balasubramanian, V., Rao, A.G., Dinaharan, I.
- Authors: Baruch, L. John , Raju, R. , Balasubramanian, V. , Rao, A.G. , Dinaharan, I.
- Date: 2016
- Subjects: Friction stir processing , Overlap multi-pass , Microstructure , Mechanical properties
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/93804 , uj:20393 , Citation: Baruch, L.J. et al. 2016. Influence of multi-pass friction stir processing on microstructure and mechanical properties of die cast Al-7Si-3Cu aluminium alloy.
- Description: Abstract: The influence of overlap multi-pass friction stir processing on the microstructure and mechanical properties, in particular, strength, ductility and hardness of die cast Al-7Si-3Cu aluminium alloy was investigated. It was observed that with the increasing number of overlap passes friction stir processing resulted in significant refinement and redistribution of aluminium silicon eutectic phase with elimination of casting porosities. The microstructural refinement by the friction stir processing not only increases the ultimate tensile strength from 121to 273 MPa, but also increases the ductility as observed by the increase in fracture strain from 1.8% to 10%. Analysis of the fractured surface reveal that microstructural refinement obtained by friction stir processing plays a vital role in transforming the fracture mode from completely mixed mode to ductile mode of fracture with increasing number of passes. Change in the size, shape, morphology and distribution of eutectic silicon particles and elimination of porosities are the main reasons for the increase in tensile strength and ductility due to friction stir processing.
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- Authors: Baruch, L. John , Raju, R. , Balasubramanian, V. , Rao, A.G. , Dinaharan, I.
- Date: 2016
- Subjects: Friction stir processing , Overlap multi-pass , Microstructure , Mechanical properties
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/93804 , uj:20393 , Citation: Baruch, L.J. et al. 2016. Influence of multi-pass friction stir processing on microstructure and mechanical properties of die cast Al-7Si-3Cu aluminium alloy.
- Description: Abstract: The influence of overlap multi-pass friction stir processing on the microstructure and mechanical properties, in particular, strength, ductility and hardness of die cast Al-7Si-3Cu aluminium alloy was investigated. It was observed that with the increasing number of overlap passes friction stir processing resulted in significant refinement and redistribution of aluminium silicon eutectic phase with elimination of casting porosities. The microstructural refinement by the friction stir processing not only increases the ultimate tensile strength from 121to 273 MPa, but also increases the ductility as observed by the increase in fracture strain from 1.8% to 10%. Analysis of the fractured surface reveal that microstructural refinement obtained by friction stir processing plays a vital role in transforming the fracture mode from completely mixed mode to ductile mode of fracture with increasing number of passes. Change in the size, shape, morphology and distribution of eutectic silicon particles and elimination of porosities are the main reasons for the increase in tensile strength and ductility due to friction stir processing.
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Microstructural characterization and sliding wear behavior of Cu/TiC copper matrix composites developed using friction stir processing
- Dinaharan, I., Akinlabi, Esther Titilayo, Hattingh, D.G.
- Authors: Dinaharan, I. , Akinlabi, Esther Titilayo , Hattingh, D.G.
- Date: 2018
- Subjects: Copper matrix composites , Friction stir processing , Titanium carbide
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290698 , uj:31562 , Citation: Dinaharan, I., Akinlabi, E.T. & Hattingh, D.G. 2018. Microstructural characterization and sliding wear behavior of Cu/TiC copper matrix composites developed using friction stir processing.
- Description: Abstract: The relatively new severe plastic deformation method, friction stir processing (FSP) is a cutting-edge process to synthesize surface and bulk metal matrix composites. The present work is focused to produce Cu/TiC copper matrix composites (CMCs) and investigate the microstructure and sliding wear behavior at room temperature without lubrication. In the beginning of the process, TiC particulates were pressed in a machined groove on the surface of copper plates. The dimensions of the groove were altered to produce four different volume fractions of TiC particulates (0, 6, 12, and 18 vol.%). FSP was accomplished by an optimized set of process parameters. The microstructure was observed using optical microscopy, scanning electron microscopy (SEM) and electron back scattered diffraction (EBSD). The microstructures showed a consistent dispersion of TiC particulates in the copper matrix irrespective of the volume fraction. The dispersion was observed to be uniform across the whole stir zone region. The interfacial bonding with the copper was proper. The reinforcement of TiC particulates enhanced the microhardness and led to a reduction the wear rate of the composite remarkably. TiC particulates changed the wear mechanism and the...
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- Authors: Dinaharan, I. , Akinlabi, Esther Titilayo , Hattingh, D.G.
- Date: 2018
- Subjects: Copper matrix composites , Friction stir processing , Titanium carbide
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290698 , uj:31562 , Citation: Dinaharan, I., Akinlabi, E.T. & Hattingh, D.G. 2018. Microstructural characterization and sliding wear behavior of Cu/TiC copper matrix composites developed using friction stir processing.
- Description: Abstract: The relatively new severe plastic deformation method, friction stir processing (FSP) is a cutting-edge process to synthesize surface and bulk metal matrix composites. The present work is focused to produce Cu/TiC copper matrix composites (CMCs) and investigate the microstructure and sliding wear behavior at room temperature without lubrication. In the beginning of the process, TiC particulates were pressed in a machined groove on the surface of copper plates. The dimensions of the groove were altered to produce four different volume fractions of TiC particulates (0, 6, 12, and 18 vol.%). FSP was accomplished by an optimized set of process parameters. The microstructure was observed using optical microscopy, scanning electron microscopy (SEM) and electron back scattered diffraction (EBSD). The microstructures showed a consistent dispersion of TiC particulates in the copper matrix irrespective of the volume fraction. The dispersion was observed to be uniform across the whole stir zone region. The interfacial bonding with the copper was proper. The reinforcement of TiC particulates enhanced the microhardness and led to a reduction the wear rate of the composite remarkably. TiC particulates changed the wear mechanism and the...
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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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Processing parameters influence on wear resistance behaviour of friction stir processed Al-TiC composites
- Akinlabi, Esther Titilayo, Mahamood, R. M., Akinlabi, S. A., Ogunmuyiwa, E.
- Authors: Akinlabi, Esther Titilayo , Mahamood, R. M. , Akinlabi, S. A. , Ogunmuyiwa, E.
- Date: 2014
- Subjects: Friction stir welding , Friction stir processing , Materials - Mechanical properties
- Type: Article
- Identifier: uj:4995 , http://hdl.handle.net/10210/13130
- Description: Friction stir processing (FSP) being a novel process is employed for the improvement of the mechanical properties of a material and the production of surface layer composites. The vital role of the integrity of surface characteristics in the mechanical properties of materials has made the research studies into surface modification important in order to improve the performance in practical applications. This study investigates the effect of processing parameters on the wear resistance behavior of friction stir processed Al-TiC composites. This was achieved through microstructural characterization by using both the optical and scanning electron microscope (SEM), microhardness profiling, and tribological characterization by means of the wear. The microhardness profiling of the processed samples revealed an increased hardness value, which was a function of the TiC particles incorporated when compared to the parent material. The wear resistance property was also found to increase as a result of the TiC powder addition. The right combination of processing parameters was found to improve the wear resistance property of the composites produced.
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- Authors: Akinlabi, Esther Titilayo , Mahamood, R. M. , Akinlabi, S. A. , Ogunmuyiwa, E.
- Date: 2014
- Subjects: Friction stir welding , Friction stir processing , Materials - Mechanical properties
- Type: Article
- Identifier: uj:4995 , http://hdl.handle.net/10210/13130
- Description: Friction stir processing (FSP) being a novel process is employed for the improvement of the mechanical properties of a material and the production of surface layer composites. The vital role of the integrity of surface characteristics in the mechanical properties of materials has made the research studies into surface modification important in order to improve the performance in practical applications. This study investigates the effect of processing parameters on the wear resistance behavior of friction stir processed Al-TiC composites. This was achieved through microstructural characterization by using both the optical and scanning electron microscope (SEM), microhardness profiling, and tribological characterization by means of the wear. The microhardness profiling of the processed samples revealed an increased hardness value, which was a function of the TiC particles incorporated when compared to the parent material. The wear resistance property was also found to increase as a result of the TiC powder addition. The right combination of processing parameters was found to improve the wear resistance property of the composites produced.
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