The role of ceramic particle loading and the influence of hot extrusion on the tribological behaviour of aluminium alloy-SiCp composites

2020 ◽  
pp. 002199832095740
Author(s):  
S Dhanalakshmi ◽  
K ShanmugaSundaram ◽  
TR Tamilarasan ◽  
R Rajendran
Keyword(s):  
Wear Resistance ◽  
Base Alloy ◽  
Wear Test ◽  
Hot Extrusion ◽  
Stir Casting ◽  
Ceramic Particle ◽  
Constant Load ◽  
Tribological Behaviour ◽  
Wear Performance ◽  
Electron Microscopes

Aluminium matrix composites (AMC) are gaining wide popularity in various sectors due to their excellent properties which are synergic. Apart from strength, wear resistance of a material is also an essential criterion for the number of applications. Extensive studies are being carried out on the secondary processing of these materials to enhance the suitability of the AMC for engineering applications. In this study, initially, Al 2014 base alloy and their composites with 5, 10, and 15 wt.% SiCp fabricated by stir casting route were subjected to wear test. Based on the encouraging wear performance, the Al-10 wt.% SiC composite was further subjected to extrusion. Pin-on-disc sliding wear tests on the as-cast & extruded base alloy and the composite samples were carried out at a constant load of 20 N for a total sliding distance of 1000 m with a velocity of 2 m/s. Microhardness and porosity measurements were carried out besides the study of wear performance, such as coefficient of friction and wear by weight loss. The worn surfaces were analyzed both by optical and scanning electron microscopes. The effect of particle addition, extrusion, porosity, and microhardness on the wear performance of the samples was discussed. Among the samples studied, the Al-10 wt.% SiC composite extruded at a ratio of 8:1 is found to have the highest wear resistance.

scholarly journals Wear Behaviour of Eutectic Al-Si Alloy-Graphite Composites Fabricated by Combined Modified Two-Stage Stir Casting and Squeeze Casting Methods

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
P. Shanmughasundaram ◽  
R. Subramanian
Keyword(s):  
Wear Resistance ◽  
Wear Test ◽  
Stir Casting ◽  
Constant Load ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Sliding Velocity ◽  
Weight Percentage ◽  
Pin On Disc ◽  
Graphite Composites

Dry sliding wear behaviour of eutectic Al-Si alloy-graphite composites was investigated employing a pin-on-disc wear test rig. Results revealed that the wear and friction coefficients decreased linearly with increasing weight percentage of graphite particles. Wear resistance of the composite increased considerably with increasing sliding velocity at constant load. In contrast, the friction coefficient of Al-7.5 wt.% Gr composite increased when the sliding velocity was increased from 1 m/s to 2 m/s at 49 N. Worn-out surfaces of wear specimens after the test were examined by scanning electron microscopy to study the morphology of worn surfaces. EDS analysis was carried out to investigate the influence of mechanically mixed layer (MML) which comprises oxides and iron, and this acted as an effective tribolayer in enhancing the wear resistance at higher sliding velocity.

Tribological Behaviour of Hot Extruded Al6061-Si3N4 Composite

2013 ◽  
Author(s):  
Ramesh Chinnakurli Suryanarayana ◽  
Saleem Khan ◽  
Praveennath G. Koppad ◽  
Zulfiqar Khan
Keyword(s):  
Wear Resistance ◽  
Silicon Nitride ◽  
Metal Matrix ◽  
Friction And Wear ◽  
Hot Extrusion ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Light Weight ◽  
Matrix Composites ◽  
Tribological Behaviour

Silicon nitride (Si3N4) possesses excellent hot hardness, wear resistance coupled with good corrosion resistance. Further, it possesses high anti friction properties making it an ideal reinforcement in developing high quality light weight, metal matrix composites for tribological applications. Silicon nitride has been successfully dispersed in aluminum alloy matrices. Their tribological properties with the beneficial effect of silicon nitride in enhancing the wear resistance of metal matrix composite have been reported by several researchers. Most of the researchers have focused on development of silicon nitride reinforced aluminum composite by powder metallurgy and casting route. However, meager information is available as regards the secondary processing of these composites in particular hot extrusion. Several researchers have reported an improved tribological behaviour in composites after extrusion. Hot extrusion of light weight metal matrix composites is very challenging. In the light of the above, this paper discusses the tribological behaviour of hot extruded Al6061 aluminum composites, which were initially developed by stir casting technique. Nickel coated silicon nitride particles were dispersed in Al6061 alloy using stir casting process. The cast composites were extruded at an extrusion ratio of 1:10 adopting a temperature of 550°C. The hot extruded composite (6Wt% Si3N4) and the matrix alloy were subjected to metallographic studies, microhardness and friction and wear tests using a pin on disc machine. Friction and wear test were carried out at loads ranging from 10 to 60 N at a sliding velocity of 0.314m/s. The worn surfaces and wear debris analysis have been carried out to understand the mechanism of wear in the developed hot extruded composites. The developed hot extruded composites exhibited lower coefficient of friction and wear rates when compared with matrix alloy.

Tribological behaviour of A390/Grp metal—matrix composites fabricated using a combination of rheocasting and squeeze casting techniques

2008 ◽  
Vol 222 (2) ◽  
pp. 257-265 ◽  
Author(s):  
T S Mahmoud
Keyword(s):  
Wear Resistance ◽  
Sliding Wear ◽  
Squeeze Casting ◽  
Dry Sliding Wear ◽  
Matrix Composites ◽  
Tribological Behaviour ◽  
Wear Performance ◽  
The Coefficient Of Friction ◽  
Steel Disc ◽  
A390 Alloy

The dry sliding wear performance of hypereutectic A390 Al—Si alloy reinforced with graphite particulates (Grp) was investigated. Composites containing 4 and 8 wt% of Grp were produced by rheocasting technique followed by squeeze casting. Pins of the materials were rubbed against a 316 stainless steel disc using pin-on-ring type apparatus under various loads and speeds. It has been observed that both wear rate and the coefficient of friction of the composites decreased considerably with Grp additions. The A390/Grp composites exhibited higher wear resistance than those obtained for the monolithic A390 alloy. The formation of the hard tribo-layer on the surface of the composites assisted in increasing the wear resistance of these materials. It is believed that the reduction of the friction coefficient is attributed the presence of the graphite layers within the tribo-layer.

scholarly journals Effect of In-situ Tribo-oxide-layer on the Non-lubricated Tribological Behaviors of LM27/ SiCp Composites

2021 ◽  
Author(s):  
Pardeep Kumar Nagpal ◽  
Suresh Kumar ◽  
Ranvir Singh Panwar ◽  
J. D. Sharma ◽  
Neeru Singla ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Contact Region ◽  
Wear Test ◽  
Stir Casting ◽  
Friction Material ◽  
Wear Performance ◽  
Pin On Disc ◽  
Fine Size ◽  
Brake Lining

In this study, an investigation on the influence of In-situ tribo-oxide-layer on non-lubricated tribological behaviours of LM27/SiCp composites was carried out at different applied loads. The variations in wear performance and microstructure of brake lining friction material (LM27) with the addition of different amounts and sizes of SiCp are explored. For this purpose, LM27/SiCp composite materials were manufactured by stir casting route varying the amount of particle reinforced from 3wt.% to 12wt.% with a different size range (fine: 1-20µm and coarse: 106-125µm). Non-lubricated dry wear tests of LM27/SiCp composites samples were trialled at different loads from 9.8N to 49N by using a pin-on-disc machine system. At a contact pressure of 0.2-1 MPa, LM27/SiCp composites with 12wt.% reinforcement showed a lower coefficient of friction than other composites. In-situ formation of oxide layers on the contact region of the specimen supports the self-lubrication during the wear test, which is responsible for better wear performance of LM27/SiCp composites. However, these study portraits that composite with 12wt. % fine size SiCp exhibits better wear performance in comparison to the other developed composites.

scholarly journals Effect of WC Grain Size and Abrasive Type on the Wear Performance of HVOF-Sprayed WC-20Cr3C2-7Ni Coatings

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 660
Author(s):  
Qun Wang ◽  
Yingpeng Zhang ◽  
Xiang Ding ◽  
Shaoyi Wang ◽  
Chidambaram Seshadri Ramachandran
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Test ◽  
Binder Phase ◽  
Repeated Impact ◽  
Wear Performance ◽  
The Matrix ◽  
Three Body

In order to investigate the effect of WC grain size on coatings’ properties and abrasive wear performance, a few WC-20Cr3C2-7Ni coatings with three different WC grain sizes were deposited by the high-velocity oxy-fuel (HVOF) thermal spray process. The phase compositions, microstructures, and mechanical properties of the coatings were investigated. Furthermore, the two- and three-body abrasive wear performances of the three coatings were tested by using SiC and SiO2 abrasives, respectively. The results show that all the three coatings were composed of WC, Cr3C2, and the Ni binder as well as the (W,Cr)2C phase. The abrasive wear resistance of the WC-20Cr3C2-7Ni coating monotonously increased with increasing WC grain size when the SiC abrasive was used in the two- and three-body abrasive wear tests. However, the wear resistance trend was reversed when the SiO2 abrasive was used in the three-body abrasive wear test. The specific wear rate of the WC-20Cr3C2-7Ni coating exposed to the SiC abrasive under the two-body abrasive wear test was the largest. The wear resistance of the coatings was more significantly affected by the hardness of the abrasive particles than the size of carbides present within the coating. The high hardness of SiC can cut both the carbide and the binder phase of the WC-based cermet coatings, resulting in a high wear rate, whereas the low hardness of SiO2 cuts and/or scratches the binder initially, and then it dislodges the carbides from the matrix. The dislodged carbides which were subsequently pulled out from the matrix by the repeated impact of the SiO2 abrasives result in a milder wear rate.

Characterization and mechanical response of novel Al-(Mg–TiFe–SiC) metal matrix composites developed by stir casting technique

2019 ◽  
Vol 53 (28-30) ◽  
pp. 3929-3938 ◽  
Author(s):  
Samuel O Akinwamide ◽  
Serge M Lemika ◽  
Babatunde A Obadele ◽  
Ojo J Akinribide ◽  
Bolanle T Abe ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Metal Matrix ◽  
Mechanical Response ◽  
Frictional Coefficient ◽  
Stir Casting ◽  
Matrix Composites ◽  
Tribological Behaviour ◽  
Casting Technique ◽  
Electron Microscopes

This study was conducted to investigate the synthesis, characterization and mechanical properties of aluminium reinforced with ferrotitanium and silicon carbide via stir casting technique. Microstructures of as-cast samples were analysed using optical and scanning electron microscopes equipped with energy-dispersive X-ray spectroscopy. The mechanical properties in terms of hardness, tensile, tribological behaviour and fracture were assessed. Results showed that the homogeneous dispersion of reinforcement was within the metal matrix composite. Tribological study revealed a decrease in frictional coefficient of the composites with lowest frictional coefficient observed in composite with addition of silicon carbide as reinforcement. Morphology of fractured surface displayed a reduction in the size of dimples formed in reinforced aluminium composites when compared with larger dimple sizes observed in as-cast aluminium alloy.

Mechanical and Tribological Properties of A7050 Hybrid Composite Reinforced with Nano Al2O3/Micro ZrO2 Particles by Stir Casting Method

2019 ◽  
Vol 969 ◽  
pp. 576-581
Author(s):  
K. Sekar ◽  
Rahul Singh
Keyword(s):  
Hybrid Composites ◽  
Base Alloy ◽  
Charpy Impact ◽  
Stir Casting ◽  
Ceramic Particle ◽  
Wear Loss ◽  
Casting Method ◽  
Mechanical And Tribological Properties ◽  
New Generation ◽  
Charpy Impact Strength

The composite plays an important role in the new generation of engineering material with better tribological and mechanical properties. In this paper, the hybrid composites of A7050/Al2O3/ZrO2 with different wt. % of reinforcement materials (0.5, 1, 1.5wt. % ZrO2, and 1wt. % Al2O3 constant for all composites) were fabricated by stir casting method. From the results, it was observed that the good texture in microstructure without defect with an addition of constant 1wt% Al2O3 and varying 0.5, 1and 1.5 wt% ZrO2. The Hardness of hybrid composites is increased by 27% with addition of 1wt % of Al2O3 and 1.5 wt% ZrO2 compare to base alloy. Charpy impact strength decreased with the addition of Al2O3 and ZrO2 ceramic particle in all the composites. From the dry wear studies, the composite with 1wt% Al2O3 and 1wt% ZrO2 was observed with minimum wear loss and low coefficient of friction.

scholarly journals Microstructure, tribological performances, and wear mechanisms of laser-cladded TiC-reinforced NiMo coatings under grease-lubrication condition

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhu Weixin ◽  
Kong Dejun
Keyword(s):  
Wear Resistance ◽  
Wear Test ◽  
Depth Of Field ◽  
X Ray Diffraction ◽  
Grease Lubrication ◽  
Wear Performance ◽  
Friction Process ◽  
X Ray ◽  
Wear Rates ◽  
Lubrication Condition

Abstract NiMo-5%TiC, NiMo-15%TiC, and NiMo-25%TiC coatings were prepared on GCr15 steel by laser cladding (LC). The microstructure and the phases of the obtained coatings were analyzed using ultra-depth-of-field microscopy (UDFM) and X-ray diffraction (XRD), respectively. A ball-on-disk wear test was used to analyze the friction-wear performance of the substrate and the NiMo-TiC coatings under grease-lubrication condition. The results show that the grain shape of NiMo-TiC coatings is dendritic. The wear resistance of NiMo-TiC coatings is improved by the addition of TiC, and the depths of the worn tracks on the substrate and on the NiMo-5%TiC, NiMo-15%TiC, and NiMo-25%TiC coatings are 4.183 μm, 2.164 μm, 1.882 μm, and 1.246 μm, respectively, and the corresponding wear rates are 72.25 μm3/s/N, 32.00 μm3/s/N, 18.10 μm3/s/N, and 7.99 μm3/s/N, respectively; this shows that the NiMo-25%TiC coating has the highest wear resistance among the three kinds of coatings. The wear mechanism of NiMo-TiC coatings is abrasive wear, and the addition of TiC plays a role in resisting wear during the friction process.

scholarly journals Mechanical Properties and Tribological Behaviour of Reinforced Aluminium Metal Matrix Composites

2020 ◽  
Vol 8 (6) ◽  
pp. 1191-1195
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Wear Test ◽  
Stir Casting ◽  
Matrix Composites ◽  
Tribological Behaviour ◽  
Casting Method ◽  
Weight Percentage ◽  
Mechanical And Tribological Properties ◽  
Aluminium Metal

This paper focuses the Mechanical properties and tribological behaviour of aluminium (6063) metal which are reinforced with silicon carbide and graphite. Different percentages like7 %, 10%, 12% of silicon carbide and 3%, 5%, 8% of Graphite were added for reinforcement. The manufacturing of components is made by using stir casting method. Mechanical properties like (fatigue, impact, micro structure) and wear test are carried out in this paper. The result concluded that there is an increase in the mechanical and tribological properties with increase in weight percentage of reinforcement.

Optimum Composition of Aluminium Hybrid Composites for Maximum Wear Resistance

2021 ◽  
Vol 319 ◽  
pp. 18-23
Author(s):  
Kumar Prakash ◽  
Nilamber Kumar Singh
Keyword(s):  
Wear Resistance ◽  
Taguchi Method ◽  
Rotational Speed ◽  
Regression Models ◽  
Hybrid Composites ◽  
Stir Casting ◽  
Constant Load ◽  
Quadratic Regression ◽  
Pin On Disc ◽  
Wear Tests

Taguchi method is applied to optimize the compositions of Al-Mg-Ti-Cu-SiC hybrid composites for maximum wear resistance. Wear tests are performed on a pin-on-disc machine under a constant load of 3 kg on specimens of above composites prepared using Taguchi L9 orthogonal array through stir casting route. Each test is conducted for 30 minutes at disc rotational speed of 600 rpm. The contribution of each constituent is evaluated using ANOVA. Linear and quadratic regression models are also developed. The predicted results by these models are very close to the experimental results. It is found that Taguchi method is very successful in the optimization of particulate reinforcements (Mg, Ti, Cu and SiC) in the composites for maximum wear resistance.

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