Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated

Nickel–Aluminium Bronze (NAB) is copper-based alloy, which widely used in marine applications because it provides high mechanical strength and low corrosion rates under turbulent flow conditions. Belongs to group of aluminium bronzes it contains 5–12 wt. % aluminium with additions of iron and nickel...

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Main Author:	Razali, Nurhaulia
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/50840/25/NurhauliaRazaliMFKM2014.pdf
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id	my-utm-ep.50840
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spelling	my-utm-ep.508402020-07-13T02:22:27Z Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated 2014-06 Razali, Nurhaulia TJ Mechanical engineering and machinery Nickel–Aluminium Bronze (NAB) is copper-based alloy, which widely used in marine applications because it provides high mechanical strength and low corrosion rates under turbulent flow conditions. Belongs to group of aluminium bronzes it contains 5–12 wt. % aluminium with additions of iron and nickel up to 6 wt. %. Presence of aluminium increases the mechanical properties of the alloy by the establishment of a face-centered cubic (FCC) phase that could improve the casting and hot working properties of the alloy. With the use of computer aided cooling curve thermal analysis (CA-CCTA) the phase transformation during casting can be revealed which can be done by the first derivation from the cooling curve data of the NAB alloy. This method is can be useful for designing the casting parameter of the NAB alloy in order to improve its mechanical property and obtained desired mechanical properties. In this research, the effect of cooling rate during solidification is demonstrated by using different mould during casting of NAB alloy whereby high cooling rate will produces finer grain as compare to slow cooling. Similarly, at higher cooling rate will result in higher hardness in comparison with the slower cooling rate. The mechanical properties of the as cast alloy will be further improved by applying heat treatment at temperature of 900 oC for two hours and water quenched followed by ageing at temperature of 350 oC - 400 oC for 1-3 hours and air cooled. Aged samples from ceramic mould attained highest hardness after aged at 350 oC for 3 hours and samples from permanent mould gave higher hardness after aged at 350 oC for one hours. Prolonged soaking time and increasing ageing temperature resulted in reducing hardness due to over aged. 2014-06 Thesis http://eprints.utm.my/id/eprint/50840/ http://eprints.utm.my/id/eprint/50840/25/NurhauliaRazaliMFKM2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:86774 masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Razali, Nurhaulia Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated
description	Nickel–Aluminium Bronze (NAB) is copper-based alloy, which widely used in marine applications because it provides high mechanical strength and low corrosion rates under turbulent flow conditions. Belongs to group of aluminium bronzes it contains 5–12 wt. % aluminium with additions of iron and nickel up to 6 wt. %. Presence of aluminium increases the mechanical properties of the alloy by the establishment of a face-centered cubic (FCC) phase that could improve the casting and hot working properties of the alloy. With the use of computer aided cooling curve thermal analysis (CA-CCTA) the phase transformation during casting can be revealed which can be done by the first derivation from the cooling curve data of the NAB alloy. This method is can be useful for designing the casting parameter of the NAB alloy in order to improve its mechanical property and obtained desired mechanical properties. In this research, the effect of cooling rate during solidification is demonstrated by using different mould during casting of NAB alloy whereby high cooling rate will produces finer grain as compare to slow cooling. Similarly, at higher cooling rate will result in higher hardness in comparison with the slower cooling rate. The mechanical properties of the as cast alloy will be further improved by applying heat treatment at temperature of 900 oC for two hours and water quenched followed by ageing at temperature of 350 oC - 400 oC for 1-3 hours and air cooled. Aged samples from ceramic mould attained highest hardness after aged at 350 oC for 3 hours and samples from permanent mould gave higher hardness after aged at 350 oC for one hours. Prolonged soaking time and increasing ageing temperature resulted in reducing hardness due to over aged.
format	Thesis
qualification_level	Master's degree
author	Razali, Nurhaulia
author_facet	Razali, Nurhaulia
author_sort	Razali, Nurhaulia
title	Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated
title_short	Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated
title_full	Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated
title_fullStr	Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated
title_full_unstemmed	Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated
title_sort	relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2014
url	http://eprints.utm.my/id/eprint/50840/25/NurhauliaRazaliMFKM2014.pdf
_version_	1747817546671718400

Relationship between microstructure and mechanical property of nickel-aluminum bronze alloy solidified at different cooling rate and heat treated

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