Influence of rotational speed of centrifugal casting process on appearance, microstructure, and sliding wear behaviour of Al-2Si cast alloy

Purpose – In the present work, thixoformed AlSi8Cu3Fe alloy was investigated for its tribological properties. The tribological analysis reveals good sliding wear behaviour for thixoformed alloy due to thixotropic microstructural character. The results are compared with sliding wear behaviour of conventional gravity cast alloy. This paper aims to discuss these subjects. Design/methodology/approach – In this study, thixoforming and gravity casting methods are used to produce materials. The ball-on-disc CSM tribometer was used to carry out the tribological tests that were performed under dry sliding conditions, under two different loads of 1N and 5N. Wear tests were performed first on the conventional gravity cast samples and then on the thixoformed counterparts in exactly the same fashion to facilitate a comparison. The microstructural characterizations are performed in optical microscopy, scanning electron microscopy and energy dispersive X-ray spectrometry. Findings – Thixoformed samples have better wear resistance than conventional gravity cast samples. The wear performance improves in thixoformed AlSi8Cu3Fe alloy thanks to changing the microstructure. The superiority of the former is attributed to its structural features. Originality/value – In this study, the thixoforming of AlSi8Cu3Fe alloy can provide important wear performance in comparison with conventional casting of AlSi8Cu3Fe alloy. This alloy is known to be used widely in automotive industry. Therefore, the alloy is highly exposed to wear and it is thought that thixoforming method can increase the wear resistant.

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Dry sliding wear behaviour of Al6061–5%SiC—TiB2 hybrid metal matrix composites synthesized by stir casting process

Materials Research Express ◽

10.1088/2053-1591/abd19b ◽

2020 ◽

Vol 7 (12) ◽

pp. 126519

Author(s):

J Justin Maria Hillary ◽

R Ramamoorthi ◽

Samson Jerold Samuel Chelladurai

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Sliding Wear ◽

Casting Process ◽

Stir Casting ◽

Wear Behaviour ◽

Dry Sliding Wear ◽

Dry Sliding ◽

Matrix Composites ◽

Sliding Wear Behaviour

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Dry Sliding Wear Behaviour of Rheocat Al-5.7si-2cu-0.3mg Alloy

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.17.16620 ◽

2018 ◽

Vol 7 (3.17) ◽

pp. 38 ◽

Cited By ~ 1

Author(s):

M A. Abdelgnei ◽

M Z. Omar ◽

M J. Ghazali ◽

Mohamed A. Gebril ◽

M N. Mohammed

Keyword(s):

Wear Mechanism ◽

Sliding Wear ◽

Cast Alloy ◽

Contact Point ◽

Optical Microscope ◽

Wear Behaviour ◽

Dry Sliding Wear ◽

Dry Sliding ◽

Pin On Disc ◽

Sliding Wear Behaviour

In this study, the effect of improved microstructure of Al-5.7Si-2Cu-0.3Mg alloys by using semisolid process on hardness and dry sliding wear behaviour were investigated. The microstructures of conventional cast alloy were totally dendritic, while in rheocasting the dendritic transfer to fine globular microstructures after using cooling slope casting. Tribological tests were carried out by using a pin-on-disc apparatus in dry sliding conditions. Wear tests were at low sliding speed 1ms-1 ,applied load at 50N and three different sliding distance (i.e., 1.8Km, 5.4Km and 9Km) respectively. An optical microscope and a scanning electron microscope were used to examine the microstructure and to understand the wear mechanism on the worn surface of both samples. The results showed that, the wear resistance of rheocast alloy was improved and higher than that those produce by conventional casting. The volume loss of rheocast alloy show reduction more than 18% at 1.8Km and 10% at 9Km compared to as-cast alloy. Moderate wear regimes were appeared in both alloys, according to the range of wear rate. The friction coefficient had increased due to increase in the contact point between pin and disc materials. The dominant wear mechanism for conventional and rheocasting alloys was adhesion wear and abrasive wear respectively.

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