A study of sliding wear behaviors of Al-7075 alloy and Al-7075 hybrid composite by response surface methodology analysis

Chauhan

2014

Tribology Online

The aluminium matrix composites, particularly with hybrid reinforcements are the advanced materials that have been widely used as a substitute material in the transport sector, to manufacture lighter-weight and higher-performance components. As these components are often subjected to sliding wear under working conditions, therefore several of these applications require enhanced frictional and wear resistance. The purpose of the current review is therefore aimed at highlighting the focus of the current research scenario, in the field of tribological behaviour of aluminium based hybrid composites, to explore the materials for automotive applications. A significant experimental data has been reported in this area, and it has been revealed that the materials possessing high wear resistance are associated with formation of a stable tribolayer on the wear surface and the fine equiaxed wear debris. The operating variables such as applied load, sliding distance and sliding speed, temperature, wearing surface hardness, reinforcement contents and morphology have been found as critical parameters in relation to the wear regime, encountered by the material during operation. An attempt has been made to present and review the various aspects relevant to sliding wear behaviour of aluminium alloys and the hybrid composites, with different combinations of reinforcements. Further, it has been found that the cost and the weight of the aluminium matrix composites can be considerably controlled, by addition of hybrid reinforcements, without compromising the tribological properties.

Section: Influence Of Mechanically Mixed Layer (Mml)supporting

confidence: 85%

Section: Reinforcing Solid Lubricants and Ceramic Particlesmentioning

confidence: 99%

Section: Reinforcing Solid Lubricants and Ceramic Particlesmentioning

confidence: 99%

See 1 more Smart Citation

A Review on Sliding Wear Behaviour of Aluminium Matrix Composites with Hybrid Reinforcements for Automotive Applications

Chauhan

2014

Tribology Online

“…The Al/SiC/Gr composites perform better than the Al/SiC composites under optimum working conditions (load, speed, and velocity) and reinforcement contents (solid lubricating particles) [45,[50][51][52]. Therefore, the reinforcement contents of the solid lubricating particles must be optimized.…”

Section: Influence Of Gr Additionmentioning

confidence: 99%

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

2016

Friction

123

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.

“…The diameter of the wire was kept fixed keeping in view the use of the wire in the FDM machine. Optimisation of the parameters was carried out using the RSM approach [22]. The historical data used are shown in Table 2.…”

Section: Model Development For Ultimate Strengthmentioning

confidence: 99%

Investigations for obtaining desired strength of Nylon6 and Fe powder-based composite wire for FDM feedstock filament

Garg

2017

Prog Addit Manuf

In the present work, an effort has been made for modelling the peak strength of Nylon6-Fe powder composite-based feedstock filament (wire) for fused deposition modelling (FDM) process. The developed filament has been used to prepare functional prototypes with ferromagnetic characteristics. The methodology involves the use of historical data approach of response surface methodology (RSM) to study the effect of input process parameters (namely: barrel temperature, die temperature, screw speed, speed of the winding machine of single screw extruder and melt flow index of composite material as rheological property) on peak strength of the filament developed. The model for prediction of peak strength of Nylon6-Fe powder composite filament has been counter verified by actual experimentation. Further, the results of the study also highlights that Nylon6-Fe composite-based FDM filament enabled successful run of this material without any change in hardware/software of the commercial FDM setup.