Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser

Aluminum is extensively utilized in industry due to its light weight, excellent workability and low cost. However, its wear resistance, hardness and mechanical properties are poor in comparison to steel. The technique of laser surface alloying was used to improve the aluminum surface properties such...

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Main Author:	Salim, Ali Aqeel
Format:	Thesis
Language:	English
Published:	2014
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/47976/25/AliAqeelSalimMFS2014.pdf
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id	my-utm-ep.47976
record_format	uketd_dc
spelling	my-utm-ep.479762017-08-16T00:55:27Z Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser 2014-04 Salim, Ali Aqeel Q Science (General) Aluminum is extensively utilized in industry due to its light weight, excellent workability and low cost. However, its wear resistance, hardness and mechanical properties are poor in comparison to steel. The technique of laser surface alloying was used to improve the aluminum surface properties such as hardness by modifying the composition and microstructure of the surface. A continuous wave (CW) CO2 laser beam was utilized for surface alloying in this research. The maximum output power of the CO2 laser is 27 W. The alloyed materials comprised of micro-powder of iron (Fe) and nickel (Ni). Pure aluminum substrate was pre-coated by a mixture of nickel and iron micro-powder with a ratio of 2:1. Hence, CO2 laser beam was irradiated on the pre-placed Fe-Ni powder to melt them together with the substrate at various times of exposure (10 - 60 s). The distance from output laser beam into the specimen was 20 cm. X-ray diffraction (XRD) and scanning electron microscope (SEM) were employed to analyze the alloying elements and study the microstructure of aluminum surface respectively. The hardness of alloyed surface was measured by using Vickers hardness tester. SEM analysis showed that the alloyed layer produced by a mixture of different elements is more homogenous and re-solidified. XRD results confirmed that several new intermetallic compounds such as Al5Fe2, Al6Fe, AlFe3, AlNi3 Al5FeNi, Al0.9Ni1.1 and Al76.8Fe14 are formed. The existence of these compounds confirmed that the aluminum surface has been alloyed. According to hardness test, the average micro-hardness of the treated surface increases approximately two times than the untreated surface. This technique is possible to alloy the surface of aluminum and improve its hardness 2014-04 Thesis http://eprints.utm.my/id/eprint/47976/ http://eprints.utm.my/id/eprint/47976/25/AliAqeelSalimMFS2014.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	Q Science (General)
spellingShingle	Q Science (General) Salim, Ali Aqeel Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser
description	Aluminum is extensively utilized in industry due to its light weight, excellent workability and low cost. However, its wear resistance, hardness and mechanical properties are poor in comparison to steel. The technique of laser surface alloying was used to improve the aluminum surface properties such as hardness by modifying the composition and microstructure of the surface. A continuous wave (CW) CO2 laser beam was utilized for surface alloying in this research. The maximum output power of the CO2 laser is 27 W. The alloyed materials comprised of micro-powder of iron (Fe) and nickel (Ni). Pure aluminum substrate was pre-coated by a mixture of nickel and iron micro-powder with a ratio of 2:1. Hence, CO2 laser beam was irradiated on the pre-placed Fe-Ni powder to melt them together with the substrate at various times of exposure (10 - 60 s). The distance from output laser beam into the specimen was 20 cm. X-ray diffraction (XRD) and scanning electron microscope (SEM) were employed to analyze the alloying elements and study the microstructure of aluminum surface respectively. The hardness of alloyed surface was measured by using Vickers hardness tester. SEM analysis showed that the alloyed layer produced by a mixture of different elements is more homogenous and re-solidified. XRD results confirmed that several new intermetallic compounds such as Al5Fe2, Al6Fe, AlFe3, AlNi3 Al5FeNi, Al0.9Ni1.1 and Al76.8Fe14 are formed. The existence of these compounds confirmed that the aluminum surface has been alloyed. According to hardness test, the average micro-hardness of the treated surface increases approximately two times than the untreated surface. This technique is possible to alloy the surface of aluminum and improve its hardness
format	Thesis
qualification_level	Master's degree
author	Salim, Ali Aqeel
author_facet	Salim, Ali Aqeel
author_sort	Salim, Ali Aqeel
title	Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser
title_short	Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser
title_full	Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser
title_fullStr	Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser
title_full_unstemmed	Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser
title_sort	laser surface alloying of pure aluminum with iron and nickel via low power co2 laser
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/47976/25/AliAqeelSalimMFS2014.pdf
_version_	1747817277499113472

Laser surface alloying of pure aluminum with iron and nickel via low power CO2 laser

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