Role of Si on machined surfaces of Al- based automotive alloys under varying machining parameters

Razin, Ahmed Asif; Ahammed, Dewan Sal-Sabil; Nur, Maglub Al; Kaiser, M. S.

doi:10.30464/jmee.2022.6.1.43

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…Machining was done to produce rectangular samples (5 mm × 5 mm x 12 mm) from the cast products. The samples were aged at 200°C for 4 hours for achieving peak strength [29]. The sample surfaces except the 5 mm × 5 mm surface were coated with PVC heat shrinkable tube so that other surfaces remain unaffected.…”

Section: Methodsmentioning

confidence: 99%

Investigation on electrochemical corrosion behavior of eutectic Al-Si automotive alloy in 0.2 M HCl, 0.2 M NaOH, and 0.2 M NaCl environments

Salim Kaiser,

Abdu

2023

JCTM

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This study aimed to evaluate the electrochemical corrosion behavior at the eutectic level of Al-Si automotive alloy in 0.2 M HCl, 0.2M NaCl, and 0.2M NaOH solutions at room temperature. By EIS method in accordance with the specific equivalent circuits of the system, and also by recording Tafel dependences, data were obtained on the kinetic and corrosion parameters in the studied environments for two types of alloys -Al-Si alloy with a eutectic composition of Si (12.7 wt. %) аnd Al-Si alloy containing traces of silicon (0.2 wt. %). Both the EIS data and the Tafel plots disclosed to addition of Si improved the corrosion resistance in the Al-Si alloy in NaCl and HCl environments. In contrast, the opposite phenomenon was observed in the NaOH environment. Added Si improved corrosion resistance by forming MgO and SiO 2 layers; nevertheless, OHmore aggressively attacks the surface than Clions, hindering the corrosion-resisting mechanism by Si. The alloys showed the best corrosion resistance in NaCl solution. In contrast, NaOH was the most destructive, followed by HCl solution, as a more compact and uniform film was formed in NaCl solution. The open circuit potential enthused to the nobler direction in eutectic alloys in NaCl and HCl solution, while NaCl showed comparatively higher open circuit potentials (OCP) than HCl and NaOH. The corrosion current from Tafel analysis and the polarization resistance from EIS analysis showed the maximum values in NaCl solution and the minimum in NaOH solution, as the corrosive attack by OHwas more damaging. The optical and SEM images revealed that scratch marks on polished surfaces were disappeared, and protective layers are formed after corrosion, which are thicker and more compact in the NaCl environment and in higher Si added alloy under NaCl and HCl solution, NaOH being an exception. These images depicted maximum damage in NaOH solution, and then in HCl solution, NaCl showed the minimum damage.

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Section: Methodsmentioning

confidence: 99%

Investigation on electrochemical corrosion behavior of eutectic Al-Si automotive alloy in 0.2 M HCl, 0.2 M NaOH, and 0.2 M NaCl environments

Salim Kaiser,

Abdu

2023

JCTM

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“…The rate of ductility minimizing with the Si content is easily understandable. Higher Si means the density of fine precipitates are maximum into the alloy, which makes the alloys brittle resulting in lower elongation [32]. Another cause of lower elongation is, higher amount of Si stays slackly into the alloy's matrix [20,33].…”

Section: Methodsmentioning

confidence: 99%

Wear studies on Al-Si automotive alloy under dry, fresh and used engine oil sliding environments

Khan¹,

Kaiser²

2022

Res. Eng. Struct. Mater.

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A comparative study has been made on the wear behavior of eutectic Al-Si automotive alloy under a dry, fresh and used engine oil sliding environment. The wear tests have been conducted using a standard pin-on-disc apparatus. The results show that with silicon content, the wear loss decreases up to the eutectic composition, mainly for an increase in strength through Si-rich intermetallics. Therefore the lower wear rate along with the coefficient of friction is observed under dry sliding environment. Under the engine oil environment, the lubricating film controls the wear, so the results are the lowest wear rate and coefficient of friction. Used oil shows both wear rate and friction coefficient to some extent higher due to the presence of heavy and harmful chemical compounds. Wear test surfaces are examined by optical and SEM analysis and found that higher abrasive wear and plastic deformation on the worn surfaces are created in dry sliding condition as well as lower Si added alloy. On the worn surface under engine oil lubricating condition, smooth surface morphology is observed as form a lubrication film and thumbs down any direct contact on the moveable surfaces. Higher Si-added alloys contain superior fine intermetallics due to ageing, which is responsible for such smooth worn surfaces.

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“…Samples of 14 mm length and 5 mm diameter were machined for using in a pin-on-disc wear apparatus. For reaching the peak-aged condition, the alloys were aged at 200 °C for 240 minutes [19][20][21]. An electric muffle furnace with a range of 900 ± 3.0 ºC was used.…”

Section: Methodsmentioning

confidence: 99%

Role of silicon on the tribological performance of Al-based automotive alloys and the effect of used motor oil

Kaiser¹,

Khan²

2022

Finnish J. Trib.

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A wear test in a used motor oil sliding environment was performed on Al-based automotive alloys with Silicon doped in various levels. Where a pin-on-disc wear testing equipment was used at a normal pressure of 1.53 MPa and a sliding speed of 0.51 m/s, kept constant. For comparison of the wear performance, dry and fresh motor oil sliding environments were also considered. The results showed that as silicon content was increased in the alloys, the wear rate decreased up to the eutectic composition, followed by an increase for all the environments. It was mainly for higher levels of Si-rich intermetallic Mg2Si precipitates in the α-aluminum matrix and made the alloys’ strength superior, in addition to increased wear resistance. In the post eutectic composition, primary silicon particles which are coarse and polyhedral appeared weakening the matrix. The coefficient of friction also decreased because of the higher hardness and the Si particles' employment as solid lubricants. In a dry environment, the wear rate and friction coefficient were much greater for their direct contact but lower under motor oil due to the reduced roughness caused by the sealing effects of the contact surfaces. Conversely, in oil environment, the opposite phenomenon was observed where a higher coefficient of friction was added to the alloy because the oil formed a thin film working as a lubricant between the contact surfaces which controlled the wear properties. Used oil demonstrates some degree of higher wear rate along with friction coefficient due to heavy and harmful chemical compounds in it. Examined by optical microscopy and SEM analysis, worn surfaces have shown that Si added alloy improved wear resistance through mild and smooth abrasive grooves filled with oxides in dry sliding conditions. In case of oil sliding environment smooth surfaces are created by the resistance of the oil film to the direct contact between the surfaces.

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Role of Si on machined surfaces of Al- based automotive alloys under varying machining parameters

Cited by 6 publications

References 19 publications

Investigation on electrochemical corrosion behavior of eutectic Al-Si automotive alloy in 0.2 M HCl, 0.2 M NaOH, and 0.2 M NaCl environments

Investigation on electrochemical corrosion behavior of eutectic Al-Si automotive alloy in 0.2 M HCl, 0.2 M NaOH, and 0.2 M NaCl environments

Wear studies on Al-Si automotive alloy under dry, fresh and used engine oil sliding environments

Role of silicon on the tribological performance of Al-based automotive alloys and the effect of used motor oil

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