Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites

Aluminium (Al) based in-situ metal matrix composites (MMCs) have better properties and performance when compared to ex-situ MMCs. Al-MMCs alloys are quite attractive due to their low density, their capability to be strengthened by precipitation, their good corrosion resistance, high thermal and elec...

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Main Author:	Ramli, Rosmamuhamadani
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Metallic composites - Case studies Alloy Titanium diboride
Online Access:	http://psasir.upm.edu.my/id/eprint/70295/1/FK%202016%2045%20-%20IR.pdf
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spelling	my-upm-ir.702952019-08-28T06:16:11Z Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites 2016-03 Ramli, Rosmamuhamadani Aluminium (Al) based in-situ metal matrix composites (MMCs) have better properties and performance when compared to ex-situ MMCs. Al-MMCs alloys are quite attractive due to their low density, their capability to be strengthened by precipitation, their good corrosion resistance, high thermal and electrical conductivity. Aluminium-copper (Al-Cu) alloys is the one of most MMCs have important high-strength Al alloys. The Al casting alloys, based on the Al-Cu system are widely used in light-weight constructions and transport applications requiring a combination of high strength and ductility. Recently, in-situ techniques have been developed to fabricate Al-based MMCs, which can lead to better adhesion at the interface and hence better mechanical properties. These in-situ routes provide many advantages such as the in-situ formed reinforcement phases are thermodynamically stable, disperse more uniformly in matrix, free of surface contamination and leading to stronger particle matrix bonding.In this research, Al-Cu master alloy was reinforced with 1 to 6wt.% titanium diboride (TiB2) obtained from salts route reactions which were potassium hexafluorotitanate (K2TiF6) and potassium tetrafluoroborate (KBF4) salts. The salts route reaction process done at 800 °C.. Then the Al-Cu alloy has characterized on the mechanical properties and microstructure characterization. The Instron tensile machine, Vickers and Rockwell hardness tester, and pin on-disc machine were used to characterize the tensile, hardness and wear properties of Al-Cu alloys respectively. Salts spray fog test and Gamry-electrode potentiometer were used to determine the corrosion rate of this alloys. From results obtained, the increasement of TiB2 contents will increased the value of tensile and hardness properties to Al-Cu alloy. The study also indicates that TiB2 particles have giving improvement the wear performance of the Al–6wt.%Cu alloy. For a constant load and sliding speed, the wear rate decreases as a function of amount of TiB2 in the composite. However, addition of TiB2 particle to the Al–6 wt%.Cu matrix has show the coefficient value of wear decreases regardless of applied load. Microstructure from scanning electron microscope (SEM) shows the composites synthesized using in-situ techniques exhibit the presence a uniform distribution of reinforcement that tends to be fine, and associated with a clean interface with the metallic matrix. Morphology observed that the particles of the TiB2 phase show a hexagonal morphology with straight and sharp edges. In order to achieve a good mechanical and wear properties it is important to control Al3Ti phase formation during the synthesis of in-situ Al-Cu/TiB2 composites. In corrosion test that conducted by salt spray fog and Gamry-electrode potentiometer, Al-Cu with composition of 3wt.%TiB2 gave the good properties in corrosion characterization compare to cast Al-Cu alloy itself. As comparison, Al-Cu with 3wt.%TiB2 gave the lowest value of corrosion rate, which means alloy has a good properties in corrosion characterization.The results obtained show that in-situ Al-Cu alloy composites containing different weight of TiB2 phase were synthesized successfully by the salt-metal reaction method and the particles were distributed evenly in the matrix of the composites. Metallic composites - Case studies Alloy Titanium diboride 2016-03 Thesis http://psasir.upm.edu.my/id/eprint/70295/ http://psasir.upm.edu.my/id/eprint/70295/1/FK%202016%2045%20-%20IR.pdf text en public doctoral Universiti Putra Malaysia Metallic composites - Case studies Alloy Titanium diboride
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Metallic composites - Case studies Alloy Titanium diboride
spellingShingle	Metallic composites - Case studies Alloy Titanium diboride Ramli, Rosmamuhamadani Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites
description	Aluminium (Al) based in-situ metal matrix composites (MMCs) have better properties and performance when compared to ex-situ MMCs. Al-MMCs alloys are quite attractive due to their low density, their capability to be strengthened by precipitation, their good corrosion resistance, high thermal and electrical conductivity. Aluminium-copper (Al-Cu) alloys is the one of most MMCs have important high-strength Al alloys. The Al casting alloys, based on the Al-Cu system are widely used in light-weight constructions and transport applications requiring a combination of high strength and ductility. Recently, in-situ techniques have been developed to fabricate Al-based MMCs, which can lead to better adhesion at the interface and hence better mechanical properties. These in-situ routes provide many advantages such as the in-situ formed reinforcement phases are thermodynamically stable, disperse more uniformly in matrix, free of surface contamination and leading to stronger particle matrix bonding.In this research, Al-Cu master alloy was reinforced with 1 to 6wt.% titanium diboride (TiB2) obtained from salts route reactions which were potassium hexafluorotitanate (K2TiF6) and potassium tetrafluoroborate (KBF4) salts. The salts route reaction process done at 800 °C.. Then the Al-Cu alloy has characterized on the mechanical properties and microstructure characterization. The Instron tensile machine, Vickers and Rockwell hardness tester, and pin on-disc machine were used to characterize the tensile, hardness and wear properties of Al-Cu alloys respectively. Salts spray fog test and Gamry-electrode potentiometer were used to determine the corrosion rate of this alloys. From results obtained, the increasement of TiB2 contents will increased the value of tensile and hardness properties to Al-Cu alloy. The study also indicates that TiB2 particles have giving improvement the wear performance of the Al–6wt.%Cu alloy. For a constant load and sliding speed, the wear rate decreases as a function of amount of TiB2 in the composite. However, addition of TiB2 particle to the Al–6 wt%.Cu matrix has show the coefficient value of wear decreases regardless of applied load. Microstructure from scanning electron microscope (SEM) shows the composites synthesized using in-situ techniques exhibit the presence a uniform distribution of reinforcement that tends to be fine, and associated with a clean interface with the metallic matrix. Morphology observed that the particles of the TiB2 phase show a hexagonal morphology with straight and sharp edges. In order to achieve a good mechanical and wear properties it is important to control Al3Ti phase formation during the synthesis of in-situ Al-Cu/TiB2 composites. In corrosion test that conducted by salt spray fog and Gamry-electrode potentiometer, Al-Cu with composition of 3wt.%TiB2 gave the good properties in corrosion characterization compare to cast Al-Cu alloy itself. As comparison, Al-Cu with 3wt.%TiB2 gave the lowest value of corrosion rate, which means alloy has a good properties in corrosion characterization.The results obtained show that in-situ Al-Cu alloy composites containing different weight of TiB2 phase were synthesized successfully by the salt-metal reaction method and the particles were distributed evenly in the matrix of the composites.
format	Thesis
qualification_level	Doctorate
author	Ramli, Rosmamuhamadani
author_facet	Ramli, Rosmamuhamadani
author_sort	Ramli, Rosmamuhamadani
title	Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites
title_short	Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites
title_full	Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites
title_fullStr	Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites
title_full_unstemmed	Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites
title_sort	characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites
granting_institution	Universiti Putra Malaysia
publishDate	2016
url	http://psasir.upm.edu.my/id/eprint/70295/1/FK%202016%2045%20-%20IR.pdf
_version_	1747812805658017792

Characterization and mechanical properties of in-situ titanium diboride fibre reinforced aluminium-copper alloy composites

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