Tribological and mechanical behavior of multilayer Cu/SiC + Gr hybrid composites for brake friction material applications
TL;DR: In this paper, the wear surface morphology and mechanisms were studied using scanning electron microscopy (SEM), XRD, and stereoscopy, and the microstructure of the composites was also characterized using SEM and optical microscopy.
About: This article is published in Wear.The article was published on 2014-09-15. It has received 81 citations till now. The article focuses on the topics: Metal matrix composite & Tribology.
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TL;DR: Hybrid Cu-ZrO2/GNPs nanocomposites were successfully produced using powder metallurgy technique as discussed by the authors, where high energy ball milling was applied for mixing powders and compaction and sintering were applied for consolidation.
81 citations
TL;DR: In this paper, the effects of solid lubricants, braking load and sliding speed on the tribological behavior of Cu/silica composites were investigated using design of experiments and statistical methods.
70 citations
TL;DR: In this article, the performance of continuous graded AA 7075 Al/SiC composites (Al-6.5%SiC and Al-9.5%) was investigated for wear, hardness, strength, and microstructure properties.
68 citations
TL;DR: Results suggested that the addition of B4C particles provided lower tendency to corrosion and lower corrosion kinetics under sliding, along with significantly reduced wear loss, mainly due to the load carrying effect given by the reinforcement particles.
Abstract: Poor wear resistance of titanium is a major concern since relative movements due to the cyclic loads in body environment cause wear between the bone and the implant material leading to detachment of the wear debris and release of metal ions due to the simultaneous action of corrosion and wear, defined as tribocorrosion. In order to increase the tribocorrosion resistance, Grade 2 Ti matrix 24vol% B4C particle reinforced composites were processed by hot pressing. Corrosion behaviour was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization in 9g/L NaCl solution at body temperature. Tribocorrosion tests were performed under open circuit potential, as well as under potentiodynamic polarization using a reciprocating ball-on-plate tribometer. Results suggested that the addition of B4C particles provided lower tendency to corrosion and lower corrosion kinetics under sliding, along with significantly reduced wear loss, mainly due to the load carrying effect given by the reinforcement particles.
52 citations
Cites background from "Tribological and mechanical behavio..."
...However, if the interfacial bonding between the matrix and the reinforcement is not strong enough, the reinforcing phases can be pulled-out during the wear action, eventually resulting in catastrophic wear by acting as extra abrasives (Ram Prabhu et al., 2014)....
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TL;DR: In this article, a copper based hybrid composites comprising of multiple reinforcements like silicon carbide and multiwalled carbon nanotubes were synthesized via mechanical milling followed by spark plasma sintering.
45 citations
References
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TL;DR: The physical and mechanical properties that can be obtained with metal matrix composites (MMCs) have made them attractive candidate materials for aerospace, automotive and numerous other applications as discussed by the authors.
Abstract: The physical and mechanical properties that can be obtained with metal matrix composites (MMCs) have made them attractive candidate materials for aerospace, automotive and numerous other applications. More recently, particulate reinforced MMCs have attracted considerable attention as a result of their relatively low costs and characteristic isotropic properties. Reinforcement materials include carbides, nitrides and oxides. In an effort to optimize the structure and properties of particulate reinforced MMCs various processing techniques have evolved over the last 20 years. The processing methods utilized to manufacture particulate reinforced MMCs can be grouped depending on the temperature of the metallic matrix during processing. Accordingly, the processes can be classified into three categories: (a) liquid phase processes, (b) solid state processes, and (c) two phase (solid-liquid) processes. Regarding physical properties, strengthening in metal matrix composites has been related to dislocations of a very high density in the matrix originating from differential thermal contraction, geometrical constraints and plastic deformation during processing.
1,624 citations
TL;DR: This review assesses the current understanding of the resistance of graded materials to contact deformation and damage, and outlines future research directions and possible applications for graded materials.
Abstract: The mechanical response of materials with spatial gradients in composition and structure is of considerable interest in disciplines as diverse as tribology, geology, optoelectronics, biomechanics, fracture mechanics, and nanotechnology. The damage and failure resistance of surfaces to normal and sliding contact or impact can be changed substantially through such gradients. This review assesses the current understanding of the resistance of graded materials to contact deformation and damage, and outlines future research directions and possible applications for graded materials.
741 citations
TL;DR: In this article, the main focus is on wrought particulate reinforced light alloy matrix systems, with a particular emphasis on tensile, creep, and fatigue behavior, and a review captures the salient features of experimental as well as analytical and computational characterization of the mechanical behavior of MMCs.
Abstract: Metal matrix composites provide significantly enhanced properties — like higher strength, stiffness and weight savings — in comparison to conventional monolithic materials. Particle reinforced MMCs are attractive due to their cost-effectiveness, isotropic properties, and their ability to be processed using similar technology used for monolithic materials. This review captures the salient features of experimental as well as analytical and computational characterization of the mechanical behavior of MMCs. The main focus is on wrought particulate reinforced light alloy matrix systems, with a particular emphasis on tensile, creep, and fatigue behavior.
641 citations
TL;DR: In this paper, the authors proposed a method for reducing residual and thermal stresses and enhancing bonding strength by grading the material composition near the interfaces or through the coating, known as functionally graded materials (FGMs).
Abstract: In today's highly demanding technological environment, one of the main challenges in new material design is combining seemingly irreconcilable thermomechanical properties in the same component (e.g., high heat and corrosion resistance, high strength in elevated-temperature applications and high resistance to wear, and high toughness in load-bearing elements). In many cases, the problem may be solved by using coatings or by layering dissimilar materials. From a structural viewpoint, a major disadvantage of these techniques, particularly in ceramic coating of metals, has been the resulting high thermal and residual stresses and relatively poor bonding strength. Thus, in thin films, coatings, and layered materials, surface cracking and debonding or delamination have been common forms of mechanical failure. One effective way of reducing residual and thermal stresses and enhancing bonding strength has been to eliminate material-property discontinuities by grading the material composition near the interfaces or through the coating. These new materials, with continuously varying compositions or volume fractions, are known as functionally graded materials (FGMs).In developing FGMs, research on the mechanics, and particularly on the fracture mechanics of these inhomogeneous materials, is needed to provide technical support to materials scientists and to manufacturing and design engineers. In the past, fracture mechanics has been useful both as a screening tool during material processing and as a design and maintenance tool for service-life assessment. Broadly speaking, fracture mechanics involves studying the effect of the applied loads, the component/flaw geometry, and the environmental conditions on the fracture of engineering materials.
582 citations
TL;DR: In this article, the influence of applied load, sliding speed, wearing surface hardness, reinforcement fracture toughness and morphology are critical parameters in relation to the wear regime encountered by the material.
519 citations