Structural Modification of Sand Cast Eutectic Al-Si Alloys with Sulfur/Sodium and Its Effect on Mechanical Properties

Onyia, C. W.; Okorie, B. A.; Neife, Simeon Ikechukwu; Obayi, Camillus Sunday

doi:10.4236/wjet.2013.12002

Cited by 17 publications

(15 citation statements)

References 15 publications

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“…6-9) machinability section support each other. The data obtained from the study are in compliance with literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Machining Propertiessupporting

confidence: 66%

“…Within this scope, among the significant aluminium alloys most commonly used in today's industries is Al-Si alloys [4,7,8,10]. It is observed that the studies conducted on aluminium alloys generally focus on such subjects as microstructure and mechanical properties analyses, hardness and creep properties analysis, porosity formation, ageing characteristics and surface roughness analyses.…”

Section: Introductionmentioning

confidence: 99%

“…Some aluminium alloys are quite important materials used in the manufacturing of various parts, predominantly in automotive, transport, aviation and aerospace sectors, in order to lower emissions that are harmful to the environment (SO X, CO 2 , and NO X emissions) and to use energy resources efficiently through weight decreases [2,[3][4][5][6]. Within this scope, among the significant aluminium alloys most commonly used in today's industries is Al-Si alloys [4,7,8,10].…”

Section: Introductionmentioning

confidence: 99%

“…Today, aluminium alloys are commonly used in numerous industries, predominantly in transport, automotive, aerospace and aviation industries [1][2][3][4][5][6][7][8]. The most important properties of aluminum alloys; in addition to aluminium alloys being plentiful in nature, its facility to produce, machine, and mould, being lightweight and its improvable mechanical properties also increase the place of use and the importance of these alloys even more in today's industries [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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EFFECT OF SILICON CONTENT ON MACHINABILITY OF Al-Si ALLOYS

Akyüz¹

2016

Adv. Sci. Technol. Res. J.

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In this study the effect of the change in the amount of Silicon (Si) occuring in Al-Si alloys on mechanical and machinability properties of the alloy was investigated. The change in mechanical properties and microstructure, which depends on the increase in Si percentage, and the effects of this change on Flank Build-up (FBU), wear on the cutting edge, surface roughness, and machinability were also studied. Alloys in different ratios of Si (i.e. 2 to 12 wt %), were employed in the study. The specimens for tests were obtained by casting into metal moulds. The results obtained from experimental studies indicate improved mechanical properties and machinability, depending on the rise in Si percentage in Al-Si alloys. It is also observed that the increase in Si percentage enhanced surface quality.

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“…6-9) machinability section support each other. The data obtained from the study are in compliance with literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Machining Propertiessupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

EFFECT OF SILICON CONTENT ON MACHINABILITY OF Al-Si ALLOYS

Akyüz¹

2016

Adv. Sci. Technol. Res. J.

View full text Add to dashboard Cite

show abstract

“…Today, aluminium alloys are commonly used in numerous industries, predominantly in automotive, transport, aviation, and aerospace industries [1][2][3][4][5][6][7][8]. In addition to aluminium alloys being plentiful in nature, their facility to produce, machine, and mould, being lightweight and their improvable mechanical properties also increase the place of use and importance of these alloys even more in today's industries [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Si content on machinability of Al-Si alloys

Akyüz¹

2021

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This study investigates the effect of the change in the amount of Si found in Al-Si alloys on mechanical properties and machinability properties of the alloy. The way the microstructure and the mechanical properties change depending on the increase in the %Si amount in the alloy and the effects of such changes on Flank Build-up (FBU), wear in the cutting edge, surface roughness, and machinability were analysed. To this end, alloys with varying amounts of silicon (i.e., 2 to 12 wt.% Si) were used in the study. Experimental samples were obtained by casting in sand moulds. It was observed in the study that, in Al-Si alloys, the mechanical properties and machinability of alloys increased depending on the rise in %Si in the alloy, that cutting forces decreased, and accordingly, machinability increased. It was also observed in the study that the increase in the %Si amount raised the surface quality (decrease in surface roughness).K e y w o r d s : machining, cutting force, mechanical properties, Al-Si alloys

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Microstructures and Mechanical Properties of In Situ Al2O3/Al-Si Composites Fabricated by Reaction Hot Pressing

Mokhnache

Wang

et al. 2014

Metall Mater Trans B

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Three in situ formed Al 2 O 3 /Al-Si composites with a different volume fraction of 10, 20, and 30 vol pct were fabricated using low energy ball milling and reaction hot pressing. The effect of reinforcement volume fraction on the microstructure and mechanical properties were studied. When the volume fraction was 30 vol pct, a massive primary Si (~130 lm) along with an increase of Al 2 O 3 (~2 lm) was observed. The YS, UTS, and Brinell hardness of the composites were significantly higher than the aluminum matrix. Mechanisms governing the tensile fracture process are discussed.Recently, aluminum matrix composites (AMCs) have been used widely as potential materials in many areas such as automobile, aerospace, and military applications. Moreover, their attractive mechanical and thermal properties including density vs strength, low thermal expansion, wear resistance, and resistance to elevated temperature make AMCs an excellent overcoming means to many technology progresses. [1][2][3][4] Reactive hot pressing (RHP) has been suggested to overcome the high concentration of porosity, which occurs during the in situ processing of composites. There, the in situ reinforcements are synthesized by an exothermic conversion of the reactants, followed by hot compaction to obtain near fully dense composites. [5,6] It has been reported that after the aluminum melts, the reduction of silica takes place forming Al 2 O 3 and Si. [7] Based on the following reaction, the in situ Al 2 O 3 /Al-Si composite can be synthesized as following:In this work, for the first time RHP was employed to fabricate Al 2 O 3 /Al-Si composites. Moreover, no reported works were carried out to clarify the effect of volume fraction of reinforcement in Al-SiO 2 system. Three composites reinforced with 10, 20, and 30 vol pct were fabricated by RHP, with the aim to investigate the effect of volume fraction of reinforcement on microstructure and tensile properties at room temperature. The tensile fracture mechanisms were also studied. Pure Al powders (99.6 pct purity) and SiO 2 powders (99.2 pct purity), with an average size of 30 and 2 lm, respectively, were used as raw materials. To produce, the in situ composites namely M10, M20, and M30 with different volume fractions 10 pct (stoichiometric starting materials were weighed according to the hypothetical Reaction [1]. The powder mixtures were ball milled using low energy at 160 rpm for 4 hours in a planetary ball mill under an argon atmosphere with a milled media to material ratio of 4:1. The mixture powders were transferred into the graphic mold pre-coated with boron nitride to avoid the reaction between the mold and the reactants. In a vacuum of 4.5 9 10 À2 Pa, different stages were used to fabricate the composites, at the first stage, the powders were heated to 873 K (600°C) and compacted with 25 MPa for 1 hour, at the second stage, the compact was heated to the synthesis temperature [1173 K (900°C)] for 1 hour to complete the reaction. At the final stage, the compact was cooled down to 853 K (580°C) and re...

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Structural Modification of Sand Cast Eutectic Al-Si Alloys with Sulfur/Sodium and Its Effect on Mechanical Properties

Cited by 17 publications

References 15 publications

EFFECT OF SILICON CONTENT ON MACHINABILITY OF Al-Si ALLOYS

EFFECT OF SILICON CONTENT ON MACHINABILITY OF Al-Si ALLOYS

Effect of Si content on machinability of Al-Si alloys

Microstructures and Mechanical Properties of In Situ Al2O3/Al-Si Composites Fabricated by Reaction Hot Pressing

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