Wear Characteristics of Recycled Cast Al-6Si-3Cu Alloys

Mwema, Fredrick Madaraka; Obiko, Japheth; Leso, T.; Mbuya, Thomas Ochuku; Mose, Bruno R.; Akinlabi, Esther Titilayo

doi:10.24874/ti.2019.41.04.13

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…These particles were then pulled off from the specimen surface layer due to the repetitive loads. This deepened the shallow grooves to fine grooves revealing a fresh layer of particles, which undergo uniform wear due to stress concentration after heat treatment [35,36]. As the sliding distance increased (1500 m), the wear rate decreased due to the slipping effect produced by the adhesion of specimen surface and undergo plastic deformation, as shown in Fig.…”

Section: Worn Surface Analysismentioning

confidence: 92%

Effect of Ni-Coated Reinforcement on Mechanical and Tribological Properties of Heat Treated Aluminium Composite

Prabhu¹,

Prasad²,

Radhika³

2020

Tribol. Ind.

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The present work focusses on improving the mechanical and tribological properties of Al-5Si-3Cu alloy and Ni-coated TiC reinforced composite fabricated through liquid metallurgy route, through T6 heat treatment. Good interfacial bonding was developed between the matrix and coated reinforcement on microstructural investigation. There was an improvement in hardness for heat-treated alloy and composite by 34.5% and 14.7% respectively. Tensile strength for heat-treated alloy and composite was enhanced by 25.9% and 30.6% respectively. Pin on disc dry sliding wear test was carried out for Ni-coated TiC heat-treated composite for varying loads (10, 20, 30N), distances (500, 1000, 1500m) and velocities (1, 2, 3m/s) by using Taguchi's L27 Orthogonal Array. It was concluded that load had the highest influence on wear rate (71.88%), whereas the effects of sliding distance (8.23%) and velocity (3.45%) were nominal. Wear analysis revealed that, wear rate increased with an increase in load and sliding velocity and decreased with increasing sliding distance. Defects like delamination, grooving, and protrusions were observed on the worn surface. Thus, this kind of Nicoated TiC reinforced composites can be used in camshafts, bearings and bushes for better wear resistance.

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Section: Worn Surface Analysismentioning

confidence: 92%

Effect of Ni-Coated Reinforcement on Mechanical and Tribological Properties of Heat Treated Aluminium Composite

Prabhu¹,

Prasad²,

Radhika³

2020

Tribol. Ind.

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“…To enable the production to be profitable, lower quality input materials are often used today, which, although they have the required chemical composition, may contain a relatively large number of impurities, originating not only from the original input materials, but also from their processing [ 12 , 13 ]. Impurities entering the process during remelting and casting are one of the primary causes of foundry defects and have negative impact on the mechanical properties of casted Al-Si components [ 14 , 15 ]. Solid impurities and various exotic inclusions are one of the primary impurities introduced in the process of implementation of the return material into the melt.…”

Section: Introductionmentioning

confidence: 99%

Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear

et al. 2022

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One of the most important indicators of casting quality is porosity. The formation of pores is largely conditioned by the presence of hydrogen in the batch and subsequently in the melt. The gasification of the melt is the primary factor increasing the porosity of casts. This paper addresses the issue of reducing the melt gasification by using FDU (Foundry Degassing Unit) unit. The gas content in the melt is evaluated by determining the Dichte Index depending on the geometry and the degree of the FDU unit rotor wear. For experiments performed under the operating conditions, three types of graphite rotors with different geometries are used. The extent of melt gasification and the Dichte Index are monitored during the rotor wear, at a rate of 0%, 25%, 50%, 75% and 100% rotor wear. Secondly, the chemical composition of the melt is monitored depending on the design and wear of the rotor. It is proven that the design and the degree of rotor wear do not have significant effect on the chemical composition of the melt and all evaluated samples fell within the prescribed quality in accordance with EN 1706. With regard to the overall comparison of the geometry and wear of individual rotor types, it has been proven that, in terms of efficiency, the individual rotors are mutually equivalent and meet the requirements for melt degassing throughout the service life.

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“…In these studies, it was shown that Al-Si alloy-based aviationgrade parts are commonly used while there are fatigue possibilities depending on the 2 working conditions of the aircraft. It is well established that Al-Si alloys are the most important alloys in terms of wear properties and improve with the concentration of Si in the alloys [9]. Wear is one of the most commonly encountered problems in industries, necessitating the replacement of mechanical components that are required but unserviceable.…”

Section: Introductionmentioning

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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Wear Characteristics of Recycled Cast Al-6Si-3Cu Alloys

Cited by 4 publications

References 17 publications

Effect of Ni-Coated Reinforcement on Mechanical and Tribological Properties of Heat Treated Aluminium Composite

Effect of Ni-Coated Reinforcement on Mechanical and Tribological Properties of Heat Treated Aluminium Composite

Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear

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

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