A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process

This study introduces a new approach of direct recycling using the hot press forging process that eliminates the two intermediate processes of cold-compact and preheating. Thereby, it leads to low energy consumption without intervening the metallurgical processes. The mechanical and physics pro...

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Main Author:	Yusuf, Nur Kamilah
Format:	Thesis
Language:	English English English
Published:	2013
Subjects:	TA401-492 Materials of engineering and construction Mechanics of materials
Online Access:	http://eprints.uthm.edu.my/2044/1/24p%20NUR%20KAMILAH%20YUSUF.pdf http://eprints.uthm.edu.my/2044/2/NUR%20KAMILAH%20YUSUF%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2044/3/NUR%20KAMILAH%20YUSUF%20WATERMARK.pdf
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spelling	my-uthm-ep.20442021-10-31T01:26:50Z A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process 2013-05 Yusuf, Nur Kamilah TA401-492 Materials of engineering and construction. Mechanics of materials This study introduces a new approach of direct recycling using the hot press forging process that eliminates the two intermediate processes of cold-compact and preheating. Thereby, it leads to low energy consumption without intervening the metallurgical processes. The mechanical and physics properties of AA6061 aluminium alloy recycled by solid-state recycling were investigated. Amounts of oxide in recycled chips were measured by using oxygen-nitrogen analyser. Oxygen concentration in the recycled specimens increased proportionally with the total surface area of the machined chip per unit volume. The performance of recycled aluminium chip on their mechanical properties and microstructure were compared with the reference specimen. The recycled specimens exhibited a remarkable potential in the strength properties (Ultimate Tensile Strength, UTS = 30.73-117.85 MPa, Elongation to Failure, ETF = 3.84-11.84 %) where it increased with increment of total surface area of chips. This is mainly attributed to grain refinement (7.9019.50µm) of the microstucture. On the other hand, recycled specimens with medium surface area of chips posed highest elongation to failure (11.84%). Grain size and oxide amount of billet have an effect on the elongation of recycled materials. Analysis for different operating temperatures showed that the higher temperatures (520°C) gave better result on mechanical properties (UTS = 117.85 MPa) and finer microstructure (7.90µm). In this study, the recycled AA6061 chip showed the good potential as the comparison of using only 17.5% of suggested pressure where 70.0 MPa (maximum operating pressure) from 400.0 MPa (suggested optimum pressure) exhibited 35.8% the ultimate tensile strength where 117.85 MPa (maximum tensile strength for recycled billet) from 327.69 MPa (reference). This proved that hot forging process could be an acceptable alternative method for recycling of AA6061 aluminum alloy chips. 2013-05 Thesis http://eprints.uthm.edu.my/2044/ http://eprints.uthm.edu.my/2044/1/24p%20NUR%20KAMILAH%20YUSUF.pdf text en public http://eprints.uthm.edu.my/2044/2/NUR%20KAMILAH%20YUSUF%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/2044/3/NUR%20KAMILAH%20YUSUF%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TA401-492 Materials of engineering and construction Mechanics of materials
spellingShingle	TA401-492 Materials of engineering and construction Mechanics of materials Yusuf, Nur Kamilah A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process
description	This study introduces a new approach of direct recycling using the hot press forging process that eliminates the two intermediate processes of cold-compact and preheating. Thereby, it leads to low energy consumption without intervening the metallurgical processes. The mechanical and physics properties of AA6061 aluminium alloy recycled by solid-state recycling were investigated. Amounts of oxide in recycled chips were measured by using oxygen-nitrogen analyser. Oxygen concentration in the recycled specimens increased proportionally with the total surface area of the machined chip per unit volume. The performance of recycled aluminium chip on their mechanical properties and microstructure were compared with the reference specimen. The recycled specimens exhibited a remarkable potential in the strength properties (Ultimate Tensile Strength, UTS = 30.73-117.85 MPa, Elongation to Failure, ETF = 3.84-11.84 %) where it increased with increment of total surface area of chips. This is mainly attributed to grain refinement (7.9019.50µm) of the microstucture. On the other hand, recycled specimens with medium surface area of chips posed highest elongation to failure (11.84%). Grain size and oxide amount of billet have an effect on the elongation of recycled materials. Analysis for different operating temperatures showed that the higher temperatures (520°C) gave better result on mechanical properties (UTS = 117.85 MPa) and finer microstructure (7.90µm). In this study, the recycled AA6061 chip showed the good potential as the comparison of using only 17.5% of suggested pressure where 70.0 MPa (maximum operating pressure) from 400.0 MPa (suggested optimum pressure) exhibited 35.8% the ultimate tensile strength where 117.85 MPa (maximum tensile strength for recycled billet) from 327.69 MPa (reference). This proved that hot forging process could be an acceptable alternative method for recycling of AA6061 aluminum alloy chips.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Yusuf, Nur Kamilah
author_facet	Yusuf, Nur Kamilah
author_sort	Yusuf, Nur Kamilah
title	A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process
title_short	A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process
title_full	A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process
title_fullStr	A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process
title_full_unstemmed	A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process
title_sort	new approach of direct recycling of aluminium alloy chips (aa6061) in hot press forging process
granting_institution	Universiti Tun Hussein Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2013
url	http://eprints.uthm.edu.my/2044/1/24p%20NUR%20KAMILAH%20YUSUF.pdf http://eprints.uthm.edu.my/2044/2/NUR%20KAMILAH%20YUSUF%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2044/3/NUR%20KAMILAH%20YUSUF%20WATERMARK.pdf
_version_	1747830903459020800

A new approach of direct recycling of aluminium alloy chips (AA6061) in hot press forging process

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