scholarly journals Improving the Wear Properties of Aluminum 6082 Alloy by Surface Compositing with Zro2 Ceramic Particles Via Friction Stir Processing

2018 ◽  
Vol 15 (1) ◽  
pp. 68-74
Author(s):  
N. Yuvaraj
Keyword(s):  
Friction Stir Processing ◽  
Volume Content ◽  
Surface Engineering ◽  
Base Alloy ◽  
Base Material ◽  
Matrix Composites ◽  
Wear Properties ◽  
Friction Stir ◽  
Surface Composites ◽  
Lower Volume

Aluminum based metal matrix composites are given more attention in fabrication of surface engineering applications due to their excellent mechanical and wear properties. In this study, Friction stir processing (FSP) method was used to fabricate the surface composite with inserting different volume % of ZrO2 reinforcement particles in the Aluminum 6082 alloy. The hardness and triblogical characteristics of fabricated surface composites and base alloy were investigated. The higher volume content of reinforcement surface revealed higher hardness and higher wear resistance compared to the lower volume content reinforcement surface and base material. The wear worn-out of composite surfaces and base alloy were examined through SEM for understanding the wear mechanisms.

scholarly journals Mechanical and Microstructural Characterization of Friction Stir Welded SiC and B4C Reinforced Aluminium Alloy AA6061 Metal Matrix Composites

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3110
Author(s):  
Kaveripakkam Suban Ashraff Ali ◽  
Vinayagam Mohanavel ◽  
Subbiah Arungalai Vendan ◽  
Manickam Ravichandran ◽  
Anshul Yadav ◽  
...  
Keyword(s):  
Wear Rate ◽  
Aluminium Alloy ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Weld Zone ◽  
Base Material ◽  
Matrix Composites ◽  
Wear Properties ◽  
Friction Stir ◽  
Behavioural Aspects

This study focuses on the properties and process parameters dictating behavioural aspects of friction stir welded Aluminium Alloy AA6061 metal matrix composites reinforced with varying percentages of SiC and B4C. The joint properties in terms of mechanical strength, microstructural integrity and quality were examined. The weld reveals grain refinement and uniform distribution of reinforced particles in the joint region leading to improved strength compared to other joints of varying base material compositions. The tensile properties of the friction stir welded Al-MMCs improved after reinforcement with SiC and B4C. The maximum ultimate tensile stress was around 172.8 ± 1.9 MPa for composite with 10% SiC and 3% B4C reinforcement. The percentage elongation decreased as the percentage of SiC decreases and B4C increases. The hardness of the Al-MMCs improved considerably by adding reinforcement and subsequent thermal action during the FSW process, indicating an optimal increase as it eliminates brittleness. It was seen that higher SiC content contributes to higher strength, improved wear properties and hardness. The wear rate was as high as 12 ± 0.9 g/s for 10% SiC reinforcement and 30 N load. The wear rate reduced for lower values of load and increased with B4C reinforcement. The microstructural examination at the joints reveals the flow of plasticized metal from advancing to the retreating side. The formation of onion rings in the weld zone was due to the cylindrical FSW rotating tool material impression during the stirring action. Alterations in chemical properties are negligible, thereby retaining the original characteristics of the materials post welding. No major cracks or pores were observed during the non-destructive testing process that established good quality of the weld. The results are indicated improvement in mechanical and microstructural properties of the weld.

scholarly journals Fabrication of AA7075 Hybrid Green Metal Matrix Composites by Friction Stir Processing Technique

2020 ◽  
Vol 44 (4) ◽  
pp. 295-300
Author(s):  
Sanjay Kumar ◽  
Ashish Kumar Srivastava ◽  
Rakesh Kumar Singh
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Friction Stir Processing ◽  
Research Work ◽  
Processing Technique ◽  
Matrix Composites ◽  
Avant Garde ◽  
Friction Stir ◽  
Surface Composites ◽  
Tool Tilt Angle

Friction stir processing is an avant-garde technique of producing new surface composite or changing the different properties of a material through intense, solid-state localized material plastic deformation. This change in properties depends upon the deformation formed by inserting a non-consumable revolving tool into the workpiece and travels laterally through the workpiece. This research work highlights the effect of process parameters on mechanical properties of fabricated surface composites by friction stir processing. By using various reinforcing materials like Ti, SiC, B4C, Al2O3 with waste elements like waste eggshells, rice husks, coconut shell and coir will be used to fabricate the green composites which are environmentally friendly and reduces the problem of decomposition. The parameter for this experiment is considered as the reinforcing materials, tool rotation speed and tool tilt angle. The SiC/Al2O3/Ti along with eggshell are selected asreinforcement materials. The main effect of the reinforcement is to improve mechanical properties, like hardness, impact strength and strength. The results revealed that the process parameters significantly affect the mechanical properties of friction stir processed surface composites.

scholarly journals Optimization of Friction Stir Process Parameters for Enhancement in Surface Properties of Al 7075-SiC/Gr Hybrid Surface Composites

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 830 ◽  
Author(s):  
Namdev Ashok Patil ◽  
Srinivasa Rao Pedapati ◽  
Othman Bin Mamat ◽  
Abdul Munir Hidayat Syah Lubis
Keyword(s):  
Wear Rate ◽  
Surface Properties ◽  
Base Alloy ◽  
Nano Particles ◽  
Micro Hardness ◽  
Wear Properties ◽  
Friction Stir ◽  
Surface Composites ◽  
Al 7075 ◽  
Independent Parameters

Friction stir processing (FSP) has evolved as an important technique in fabrication of metal matrix composites. The surface properties enhancement is obtainable by insertion of desired discontinuous particular reinforcements into base alloy using FSP. Despite having high specific strength, more applications of Al alloys are restricted due to their poor surface properties under various loading conditions. In this study, the main focus is on enhancing the microhardness and wear properties of Al 7075 base alloy by means of uniform dispersion of silicon carbide and graphite (SiC/Gr) nano particles into the base alloy using the FSP technique. The tool rotational speed (w: 500, 1000, 1500 rpm), tool traverse speed (v: 20, 30, 40 mm/min), reinforcement particles hybrid ratio (HR: 60:40, 75:25, 90:10) and volume percentage (vol%: 4%, 8%, 12%) are used as independent parameters. The effect of these parameters on microstructure, micro hardness and wear properties of surface composites are studied in detail. For desired wear rate and microhardness as responses, the aforementioned independent parameters are optimized using response surface methodology (RSM). The significance of factors and their interactions for maximizing hardness and minimizing wear rate and coefficient of friction (COF) were determined. Analysis of variance (ANOVA) for responses has been carried out, and the models were found to be significant in all three responses. The minimum wear rate of 0.01194 mg/m was obtained for parameters w 1500 rpm, v 40 mm/min, HR 60:40, vol% 4 (Run 10). The maximum micro hardness of 300 HV obtained for parameters w 1000 rpm, v 30 mm/min, HR 75:25, vol% 12 (Run 14). The presence and uniform distribution of SiC and Gr into the base alloy was confirmed through field-emission scanning electron microscopy (FESEM) imaging, energy-dispersive X-ray spectroscopy (EDX) and mapping tests. The wear rate and COF decreased significantly due to graphitized mechanically mixed layer developed at the sliding contacts. The microhardness of resultant composites observed to be dependent on effect of the independent parameters on extent of inherent precipitates dissolution and grain size strengthening in the resultant materials.

Wear Characteristics of Friction Stir Processed Magnesium RZ 5 Composites

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
G. Vedabouriswaran ◽  
S. Aravindan
Keyword(s):  
Base Alloy ◽  
Wear Test ◽  
Mg Alloy ◽  
Matrix Composites ◽  
Multiwalled Carbon ◽  
Wear Rates ◽  
Friction Stir ◽  
Surface Composites ◽  
Developed Surface ◽  
Surface Metal

Friction stir processing is performed on RZ 5 Mg alloy to produce surface metal matrix composites reinforced with hard reinforcement particles. Boron carbide, multiwalled carbon nanotubes, and a mixture of zirconia and alumina particle reinforcements were introduced. The developed surface composites (SCs) exhibited lower wear rates at various normal loads than the base RZ 5 Mg alloy owing to their improved microhardness. The wear resistance of the composites was 1.2–1.9 times greater than the base alloy, and hence, the wear rates were 18–50% lower than the base alloy. Maximum reduction in wear rate is observed in B4C-reinforced SC. Abrasion, adhesion, and oxidative wear mechanisms are operational during the wear test performed at loads ranging between 10 N and 75 N.

Fabrication of AA6061-0/RHA Surface Composite via Friction Stir Processing

2014 ◽  
Vol 660 ◽  
pp. 214-218 ◽  
Author(s):  
Samir Sani Abdulmalik ◽  
Rosli Ahmad
Keyword(s):  
Rice Husk ◽  
Friction Stir Processing ◽  
Rice Husk Ash ◽  
Base Material ◽  
Homogeneous Distribution ◽  
Matrix Composites ◽  
Friction Stir ◽  
Mechanical Stirring ◽  
The Matrix ◽  
Surface Metal

Friction stir processing is a novel process evolved to fabricate surface metal matrix composites. Rice husk ash (RHA) is an agro-industrial waste and by product of rice husk. The feasibility of incorporating RHA powder into aluminium alloy AA6061-0 as reinforcement particles to make surface matrix composite via FSP is reported in this paper. The optical micrographs revealed a homogeneous distribution of RHA particles which were well bonded with the matrix in both first and fourth-passes of the FSP due to mechanical stirring. Microhardness of the stir zone SZ with the RHA particles of I-pass increased to about 106 HV, 40% higher than that of the base material 66 HV by dispersed RHA particles.

Effect of microstructure and precipitate formation on mechanical and corrosion behavior of friction stir processed AA6061 alloy using different cooling media

2021 ◽  
pp. 146442072110057
Author(s):  
Marukurti VNV Satyanarayana ◽  
Adepu Kumar ◽  
Shivraman Thapliyal
Keyword(s):  
Corrosion Resistance ◽  
Friction Stir Processing ◽  
Base Alloy ◽  
Base Material ◽  
Stir Zone ◽  
Grain Structure ◽  
Precipitate Formation ◽  
Friction Stir ◽  
Aa6061 Alloy ◽  
Effect Of Microstructure

The present work studies the effect of microstructure and precipitate formation on mechanical and corrosion characteristics of friction stir processed AA6061 alloy using different cooling technologies (cryogenic and water cooling). The results revealed that recrystallized fine grains formed in all friction stir processing samples (grain size within a range of 2–6 µm) as a result of dynamic recovery and recrystallization, while samples processed in cooling-assisted friction stir processing resulted in better grain refinement in the stir zone than in air-cooled friction stir processing. Three kinds of precipitates (Fe-based needle-shaped precipitates, Si-based round-shaped precipitates, and chain of small round-shaped Si-based precipitates) were identified in base material and friction stir processing samples. Compared to air-cooled friction stir processing, in cooling-assisted friction stir processing, the hardness and tensile strength increased but remained lower than for the base alloy due to the presence of high density Fe-based needle-shaped precipitates. The ductility after friction stir processing greatly improved due to thermal softening and dissolution of precipitates. The corrosion results demonstrated that the corrosion resistance greatly enhanced after friction stir processing due to uniform distribution of grain structure and discontinuous chain of small round-shaped Si-based precipitates in stir zone. Moreover, cooling-assisted friction stir processing resulted in improved corrosion resistance compared to air-cooled friction stir processing due to the formation of fine precipitates.

scholarly journals Technological Aspects of Producing Surface Composites by Friction Stir Processing—A Review

2021 ◽  
Vol 5 (12) ◽  
pp. 323
Author(s):  
Józef Iwaszko ◽  
Moosa Sajed
Keyword(s):  
Friction Stir Processing ◽  
Surface Engineering ◽  
Number Of Solutions ◽  
Friction Stir ◽  
Surface Composites ◽  
Refinement Method ◽  
Wide Range ◽  
Application Potential ◽  
Composite Microstructure ◽  
The Individual

FSP (friction stir processing) technology is a modern grain refinement method that is setting new trends in surface engineering. This technology is used not only to modify the microstructure of the surface layer of engineering materials, but increasingly more often also to produce surface composites. The application potential of FSP technology lies in its simplicity and speed of processing and in the wide range of materials that can be used as reinforcement in the composite. There are a number of solutions enabling the effective and controlled introduction of the reinforcing phase into the plasticized matrix and the production of the composite microstructure in it. The most important of them are the groove and hole methods, as well as direct friction stir processing. This review article discusses the main and less frequently used methods of producing surface composites using friction stir processing, indicates the main advantages, disadvantages and application limitations of the individual solutions, in addition to potential difficulties in effective processing. This information can be helpful in choosing a solution for a specific application.

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