The role of tribo-layers on the sliding wear behavior of graphitic aluminum matrix composites

Riahi, A.R.; Alpas, A.T.

doi:10.1016/s0043-1648(01)00796-7

Cited by 247 publications

(115 citation statements)

References 21 publications

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“…Thereafter, the variation in the microhardness of the subsurface zone disappears in Zone 3. The increased hardness of Zone 1 may be attributed to the higher oxidation of the transferred material at the interface and the presence of surface film on the wear surface [13,71,72]. The variation in hardness of the wear surface of the Al/SiC composite at a sliding speed of 4.6 m/s is presented in Fig.…”

Section: Surface and Subsurface Behaviormentioning

confidence: 97%

“…However, Al composites consist of hard and 192 Friction 4(3): 191-207 (2016) brittle reinforcements protruding over the surface (acting as asperities). These asperities interact with the counterface and provide more strength to the composites during the initial run-in-period [12][13][14][15]. Increased strength results in low deformation of asperities, which leads to the abrasion of the wear surface [16].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication characteristics and tribological behavior of Al/SiC/Gr hybrid aluminum matrix composites: A review

Singh

2016

Friction

114

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Improvement in surface properties and retainment of bulk properties are essential requirements for the design of components for wear resistance applications. This paper summarizes various features of Al/SiC/Gr hybrid composites that can be employed in different tribological applications. The study has revealed that the processing route plays a significant role in obtaining a homogeneous structure of these composites. In powder metallurgy, the selection of sizes of the matrix and reinforcement powders is crucial, whereas the wettability between the reinforcement particles and molten alloy is a major challenge in liquid metallurgy. The incorporation of SiC particles increases the mechanical strength and wear performance of Al composites. However, ejection of these particles can reduce the wear performance of Al composites under severe conditions. The addition of Gr particles helps in the formation of a thick and extensive tribolayer on the wear surface. This layer reduces direct contact between the rubbing surfaces, thereby decreasing the wear rate under certain conditions. Morphological analysis of worn surfaces has confirmed that the hybrid composites exhibit superior wear properties than the pure Al alloy and the ceramic-reinforced composite. However, increase in the Gr content beyond a limiting value can deteriorate the tribological properties of these composites. Therefore, true optimization of a tribosystem (of the hybrid composite and counterface) can be achieved by selecting appropriate reinforcement contents.

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Section: Surface and Subsurface Behaviormentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Fabrication characteristics and tribological behavior of Al/SiC/Gr hybrid aluminum matrix composites: A review

Singh

2016

Friction

114

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“…An approach in SiC p /Al (SiC particles embedded in Al matrix) composite production is to incorporate graphite particles as additional reinforcement into the SiC p /Al composites. The graphite-embedded SiC p /Al composites showed better wear resistance and low coefficient of friction when compared to SiC p /Al composites without graphite reinforcement [3,6,7].…”

Section: Introductionmentioning

confidence: 96%

Tribology of Metal Matrix Composites

Rohatgi

Tabandeh-Khorshid

Omrani

et al. 2013

Tribology for Scientists and Engineers

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Metal matrix composites (MMCs) are an important class of engineering materials that are increasingly replacing a number of conventional materials in the automotive, aerospace, marine, and sports industries due to their lightweight and superior mechanical properties. In MMCs, nonmetallic materials are embedded into the metals or the alloys as reinforcements to obtain a novel material with attractive engineering properties, such as improved ultimate tensile strength, ductility, toughness, and tribological behavior. In this chapter, an attempt has been made to summarize the tribological performance of various MMCs as a function of several relevant parameters. These parameters include material parameters (size, shape, volume fraction, and type of the reinforcements), mechanical parameters (normal load and sliding speed), and physical parameters (temperature and the environment). In general, it was shown that the wear resistance and friction coefficient of MMCs are improved by increasing the volume fraction of the reinforcements. As the normal load and sliding speed increase, the wear rate of the composites increases and the friction coefficient of the composites decreases. The wear rate and friction coefficient decrease with increasing temperature up to a critical temperature, and thereafter both wear rate and friction coefficient increase with increasing temperature. The nano-composites showed best friction and wear performance when compared to micro-composites.

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“…Therefore, most of the new studies focus on the formation of structure and properties of hybrid composites [9][10][11][12][13][14][15][16]. Such composites (i.e: Al/SiC-Cg or Al/SiCgraphite) have better physical, mechanical and tribological properties than the composites, which are reinforced by only one type of reinforcements [12]. It has been shown that graphite particles may create a protective lubricating layer between two contact surfaces during sliding [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Sr and Mg Alloying Additions on the Bonding Between Matrix and Reinforcing Particles in the AlSi7Mg/SiC-Cg Hybrid Composite

Dolata-Grosz¹,

Dyzia²,

Boczkal³

2016

Archives of Metallurgy and Materials

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Influence of the Sr and Mg alloyIng addItIonS on the bondIng between MatrIx and reInforcIng partIcleS In the alSi7Mg/Sic-cg hybrId coMpoSIteThe aim of the work was to perform adequate selection of the phase composition of the composite designated for permanent -mould casting air compressor pistons. The hybrid composites based on AlSi7Mg matrix alloy reinforced with mixture of silicon carbide (SiC) and glassy carbon (Cg) particles were fabricated by the stir casting method. It has been shown that the proper selection of chemical composition of matrix alloy and its modification by used magnesium and strontium additions gives possibility to obtain both the advantageous casting properties of composite suspensions as well as good bonding between particles reinforcements and matrix.

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The role of tribo-layers on the sliding wear behavior of graphitic aluminum matrix composites

Cited by 247 publications

References 21 publications

Fabrication characteristics and tribological behavior of Al/SiC/Gr hybrid aluminum matrix composites: A review

Fabrication characteristics and tribological behavior of Al/SiC/Gr hybrid aluminum matrix composites: A review

Tribology of Metal Matrix Composites

Influence of the Sr and Mg Alloying Additions on the Bonding Between Matrix and Reinforcing Particles in the AlSi7Mg/SiC-Cg Hybrid Composite

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