Microstructure and tensile properties of cast Al-15%Mg <inf>2</inf>Si composite: Effects of phosphorous addition and heat treatment

Nasiri, N; Emamy, M; Malekan, A; Norouzi, MH

Microstructure and tensile properties of cast Al-15%Mg <inf>2</inf>Si composite: Effects of phosphorous addition and heat treatment

Nasiri, N

Emamy, M Malekan, A Norouzi, MH

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Publication Type:: Journal Article
Citation:: Materials Science and Engineering A, 2012, 556 pp. 446 - 453
Issue Date:: 2012-10-30

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Field	Value	Language
dc.contributor.author	Nasiri, N https://orcid.org/0000-0003-4738-098X	en_US
dc.contributor.author	Emamy, M	en_US
dc.contributor.author	Malekan, A	en_US
dc.contributor.author	Norouzi, MH	en_US
dc.date.issued	2012-10-30	en_US
dc.identifier.citation	Materials Science and Engineering A, 2012, 556 pp. 446 - 453	en_US
dc.identifier.issn	0921-5093	en_US
dc.identifier.uri	http://hdl.handle.net/10453/115354
dc.description.abstract	The effects of solution heat treatment and phosphorous addition on the microstructure and tensile properties of in situ Al-15%Mg 2Si composite specimens have been investigated. The Al-15%Mg 2Si composite ingot was made by in-situ process and different amounts of phosphorous (0.1, 0.3, 0.5, 0.7 and 1wt% P) were added to the remelted composite. Then, the specimens were subjected to solutionizing at 500°C for holding time of 4h followed by quenching. Optical microscopy (OM) and scanning electron microscopy (SEM) indicated that phosphorous addition not only changes the morphology of primary Mg 2Si particles from dendritic to a regular shape, but also it reduces Mg 2Si particle size. Solutionizing led to the dissolution of the Mg 2Si particles and changed their morphology to round shape. The results obtained from tensile testing revealed that both phosphorous addition and solution heat treatment improve ultimate tensile strength (UTS) and elongation (El.%) values. According to the results, the optimum tensile property was achieved by adding 0.5wt% P to the Al-Mg 2Si composite after solution heat treatment. Fractographic analysis revealed a cellular nature for the fracture surface of the MMC. As a result of P addition the potential sites for stress concentration and crack initiation areas were reduced due to microstructural modification, while increase in the number of fine dimples rendered the nature of fracture from brittle to ductile and also improved tensile properties. © 2012 Elsevier B.V.	en_US
dc.relation.ispartof	Materials Science and Engineering A	en_US
dc.relation.isbasedon	10.1016/j.msea.2012.07.011	en_US
dc.subject.classification	Materials	en_US
dc.title	Microstructure and tensile properties of cast Al-15%Mg <inf>2</inf>Si composite: Effects of phosphorous addition and heat treatment	en_US
dc.type	Journal Article
utslib.citation.volume	556	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	0910 Manufacturing Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	556	en_US

Abstract:

The effects of solution heat treatment and phosphorous addition on the microstructure and tensile properties of in situ Al-15%Mg 2Si composite specimens have been investigated. The Al-15%Mg 2Si composite ingot was made by in-situ process and different amounts of phosphorous (0.1, 0.3, 0.5, 0.7 and 1wt% P) were added to the remelted composite. Then, the specimens were subjected to solutionizing at 500°C for holding time of 4h followed by quenching. Optical microscopy (OM) and scanning electron microscopy (SEM) indicated that phosphorous addition not only changes the morphology of primary Mg 2Si particles from dendritic to a regular shape, but also it reduces Mg 2Si particle size. Solutionizing led to the dissolution of the Mg 2Si particles and changed their morphology to round shape. The results obtained from tensile testing revealed that both phosphorous addition and solution heat treatment improve ultimate tensile strength (UTS) and elongation (El.%) values. According to the results, the optimum tensile property was achieved by adding 0.5wt% P to the Al-Mg 2Si composite after solution heat treatment. Fractographic analysis revealed a cellular nature for the fracture surface of the MMC. As a result of P addition the potential sites for stress concentration and crack initiation areas were reduced due to microstructural modification, while increase in the number of fine dimples rendered the nature of fracture from brittle to ductile and also improved tensile properties. © 2012 Elsevier B.V.

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http://hdl.handle.net/10453/115354