scholarly journals Wear and Friction Behavior of Gr/Sn Solid Lubricated Dual Reinforced AMCs

2021 ◽  
Author(s):  
Varun Singhal ◽  
Om Prakash Pandey
Keyword(s):  
Wear Rate ◽  
Solid Lubricant ◽  
Stir Casting ◽  
Sem Analysis ◽  
Friction Behavior ◽  
Casting Technique ◽  
Aluminum Metal ◽  
Aluminum Metal Matrix Composite ◽  
Wear And Friction ◽  
The Matrix

Abstract The current work has been undertaken to see the effect of Gr/Sn as a solid lubricant for the development of hybrid aluminum metal matrix composite (HAMCs). HAMCs were fabricated by reinforcing 10 wt. % (sillimanite + ilmenite) minerals with or without 1 wt. % Sn/Gr/both solid via stir casting technique. Optical microscopy revealed a homogenous distribution of reinforced particles with the refinement of silicon. Vicker hardness of the HAMCs showed a good interfacial bonding of particles with the matrix. The wear rate and coefficient of friction of the HAMCs are reduced with a maximum of composite with tin and graphite as lubrication agents. The composite contained tin and graphite wear rate as lubrication agents were in tune with the cast-iron brake drum used in the automobile industries. Abrasive wear was dominant at low loads and adhesive wear at high load, as confirmed from SEM analysis.

Effect of Graphite Addition on the Mechanical Properties of Stir Cast Particulate Aluminum Metal Matrix Composite Reinforced with Alumina and Silicon Carbide

2014 ◽  
Vol 612 ◽  
pp. 163-168 ◽  
Author(s):  
Swanand R. Kulkarni ◽  
P.M. Sonawane ◽  
M.G. Karnik
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Casting Process ◽  
Stir Casting ◽  
Homogeneous Distribution ◽  
Aluminum Metal ◽  
Aluminum Metal Matrix Composite ◽  
Varied Temperature ◽  
The Matrix

Fabrication of PAMC by stir casting, at semisolid stage of the matrix results in homogeneous distribution of the reinforcements in the matrix, which leads to better mechanical and tribological property of the composite. In present study aluminum alloy Al6082 was reinforced with 1% Al2O3 and 3% SiC and 0 to 6% graphite particles by weight. We have varied temperature, speed of agitation and kept all other parameters constant. With present stir casting process, we have successfully processed the total reinforcement up to15% by weight. PAMC has shown 23% increase in hardness, 110% increase in tensile strength and 54% increase in the stiffness. With increase in the graphite reinforcement, coefficient of friction and wear rate of PAMC decreases. Coefficient of friction stabilizes between 0.3 to 0.33 and wear rate stabilizes near to 0.00005 mm3/Nm.

Mechanical characterization of LM25 alloy matrix composite reinforced with boron carbide

2021 ◽  
pp. 002199832110055
Author(s):  
Zeeshan Ahmad ◽  
Sabah Khan
Keyword(s):  
Tensile Strength ◽  
Boron Carbide ◽  
Mechanical Characterization ◽  
Stir Casting ◽  
Surface Mapping ◽  
Alloy Matrix ◽  
Casting Technique ◽  
The Matrix ◽  
Carbide Particles

Alumnium alloy LM 25 based composites reinforced with boron carbide at different weight fractions of 4%, 8%, and 12% were fabricated by stir casting technique. The microstructures and morphology of the fabricated composites were studied by scanning electron microscopy and energy dispersive spectroscopy. Elemental mapping of all fabricated composites were done to demonstrate the elements present in the matrix and fabricated composites. The results of microstructural analyses reveal homogenous dispersion of reinforcement particles in the matrix with some little amount of clustering found in composites reinforced with 12% wt. of boron carbide. The mechanical characterization is done for both alloy LM 25 and all fabricated composites based on hardness and tensile strength. The hardness increased from 13.6% to 21.31% and tensile strength 6.4% to 22.8% as reinforcement percentage of boron carbide particles increased from 0% to 12% wt. A fractured surface mapping was also done for all composites.

A study on tribological behaviour and analysis of ZnO reinforced AA6061 matrix composites fabricated by stir casting route

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sakthi Sadhasivam RM ◽  
Ramanathan K. ◽  
Bhuvaneswari B.V. ◽  
Raja R.
Keyword(s):  
Wear Rate ◽  
Sliding Wear ◽  
Stir Casting ◽  
Industrial Applications ◽  
Wear Behaviour ◽  
Matrix Composites ◽  
Tribological Behaviour ◽  
Content Type ◽  
Zno Particles ◽  
The Matrix

Purpose The most promising replacements for the industrial applications are particle reinforced metal matrix composites because of their good and combined mechanical properties. Currently, the need of matrix materials for industrial applications is widely satisfied by aluminium alloys. The purpose of this paper is to evaluate the tribological behaviour of the zinc oxide (ZnO) particles reinforced AA6061 composites prepared by stir casting route. Design/methodology/approach In this study, AA6061 aluminium alloy matrix reinforced with varying weight percentages (3%, 4.5% and 6%) of ZnO particles, including monolithic AA6061 alloy samples, is cast by the most economical fabrication method, called stir casting. The prepared sample was subjected to X-ray photoelectron spectroscopy (XPS) analysis, experimental density measurement by Archimedian principle and theoretical density by rule of mixture and hardness test to investigate mechanical property. The dry sliding wear behaviour of the composites was investigated using pin-on-disc tribometer with various applied loads of 15 and 20 N, with constant sliding velocity and distance. The wear rate, coefficient of friction (COF) and worn surfaces of the composite specimens and their effects were also investigated in this work. Findings XPS results confirm the homogeneous distribution of ZnO microparticles in the Al matrix. The Vickers hardness result reveals that higher ZnO reinforced (6%) sample have 34.4% higher values of HV than the monolithic aluminium sample. The sliding wear tests similarly show that increasing the weight percentage of ZnO particles leads to a reduced wear rate and COF of 30.01% and 26.32% lower than unreinforced alloy for 15 N and 36.35% and 25% for 20 N applied load. From the worn surface morphological studies, it was evidently noticed that ZnO particles dispersed throughout the matrix and it had strong bonding between the reinforcement and the matrix, which significantly reduced the plastic deformation of the surfaces. Originality/value The uniqueness of this work is to use the reinforcement of ZnO particles with AA6061 matrix and preparing by stir casting route and to study and analyse the physical, hardness and tribological behaviour of the composite materials.

Effects of Red Mud Reinforcement on Hardness, Wear Behaviour of Cast Al-6Si-0.45 Mg Alloy

2015 ◽  
Vol 787 ◽  
pp. 658-663 ◽  
Author(s):  
B. Geetha ◽  
K. Ganesan
Keyword(s):  
Mechanical Properties ◽  
Wear Rate ◽  
Red Mud ◽  
Tamil Nadu ◽  
Artificial Aging ◽  
Base Alloy ◽  
Solution Treatment ◽  
Stir Casting ◽  
Wear Behaviour ◽  
Casting Technique

An Investigation was carried out to study the effect of red mud reinforcement in Al-6Si-0.45Mg alloy (A356) for improving hardness, wear rate and co-efficient friction. The red mud 53 micron size particles collected from MALCO, Mettur, Tamil Nadu, India, was preheated in a furnace to 500o C and mixed with molten Al-6Si-0.45Mg alloy to make the composite specimens. Al-6Si-0.45Mg alloy-red mud composite specimens were manufactured by stir casting technique using Al-6Si-0.45Mg alloy as matrix and reinforced with 5%, 10%, 15% and 20% volume percentages red mud as the reinforcement. The Al-6Si-0.45Mg alloy–red mud composite specimens were T6 heat treated to improve the mechanical properties. The artificial aging time and aging duration were varied to study their effect on mechanical properties of the composites. Then the specimens hardness, wear rate and coefficient of friction were tested as per ASTM standards. It was found that the hardness increased when the red mud content was increased in the base alloy at all the heat treatment conditions. The peak age timing which gives highest hardness was found to decrease with increased red mud content. The wear rate was decreased when the hardness was increased. The effect of solution treatment and artificial aging on the microstructure was also studied by microscopy.

Mechanical properties and fracture mechanism of ZA-27/TiO2 particulate metal matrix composites

2003 ◽  
Vol 217 (3) ◽  
pp. 201-206 ◽  
Author(s):  
K H W Seah ◽  
S C Sharma ◽  
M Krishna
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Fracture Mechanism ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Primary Objective ◽  
Matrix Composites ◽  
Casting Technique ◽  
Titanium Dioxide Particle ◽  
The Matrix

The mechanical properties and the fracture mechanism of composites consisting of ZA-27 alloy reinforced with titanium dioxide particles were investigated with the primary objective of understanding the influence of the particulate reinforcement on the mechanical behaviour of the ZA-27 alloy. The titanium dioxide particle content in the composites ranged from 0 to 6 per cent, in steps of 2 wt %. The composites were fabricated by the stir casting technique in which the reinforcement particles were dispersed in the vortex created in the molten matrix alloy. The study revealed improvements in Young's modulus, ultimate tensile strength (UTS), compressive strength, yield strength and hardness of the composites as the titanium dioxide content was increased, but at the expense of ductility and impact strength. The fracture behaviour of the composite was also significantly influenced by the presence of titanium dioxide particles. Eventual fracture was a result of crack propagation through the matrix as well as through the reinforcing particles. Scanning electron microscopy and fractography analyses were carried out to provide suitable explanations for the observed phenomena.

scholarly journals Effect of addition of different reinforcements on the microstructure and mechanical characterization of the Al-Flyash composites

2021 ◽  
Vol 15 (56) ◽  
pp. 217-228
Author(s):  
Milind K. Wasekar ◽  
Mohan P. Khond
Keyword(s):  
Tensile Strength ◽  
Hybrid Composites ◽  
Tensile Tests ◽  
Stir Casting ◽  
Interface Bonding ◽  
Casting Technique ◽  
Testing Procedures ◽  
The Matrix ◽  
Aluminum 6061 Alloy

The aim of this work is to investigate the influence of the addition of silicon carbide and molybdenum disulfide on the microstructure and the tensile strength of the Al-Flyash hybrid composites prepared using the stir casting technique. The composite with aluminum 6061 alloy as the matrix and flyash as the reinforcement, with different weight fractions, is investigated to study its microstructure and the tensile strength. The same has been compared with the hybrid composites with Aluminum-Flyash/SiC and Aluminum-Flyash/MoS2 for different weight fractions of the reinforcements. The tensile tests were conducted as per ASTM standard testing procedures at room temperature. From the results it is identified that tensile strength of the Al6061-Flyash composite is lesser than the Al6061-Flyash/SiC and Al6061-Flyash/MoS2 hybrid composites. It is also observed that increment in the composition of the SiC and MoS2 causes the increment in the tensile strength of the hybrid composite. This increment in the tensile strength is due to good interface bonding and uniform distribution of the reinforcements in the composite.

scholarly journals Microstructure And Mechanical Properties of Ultrasonically Processed Al-7Si Alloy / Y2O3 Nanocomposite

2021 ◽  
Author(s):  
T. Satish Kumar ◽  
Jayakrishnan Nampoothiri ◽  
S. Shalini
Keyword(s):  
Mechanical Properties ◽  
Ultrasonic Treatment ◽  
A356 Alloy ◽  
Stir Casting ◽  
Porosity Level ◽  
Aluminum Metal ◽  
Microstructure And Mechanical Properties ◽  
Aluminum Metal Matrix Composite ◽  
Alloy Addition ◽  
A356 Aluminum

Abstract The aim of the present study is to investigate the microstructure and mechanical properties of the A356 aluminum metal matrix composite reinforced with Y2O3 particles. The composite is synthesized by adding 1 and 2 vol.% of reinforcement via stir casting assisted by ultrasonic treatment (UT). Microstructural contemplates shows improvement in the dispersion of nano Y2O3 particles and decrease in the porosity level due to the ultrasound aided synthesis. The UT refines the size of the Y2O3 particles as well as helps to improve its dispersion. The secondary dendrite arm spacing of 2 vol.% Y2O3 reinforced samples with 5 min UT is found to be significantly reduced to 12 µm as compared to that of the as-cast A356 alloy. Addition of 2 vol.% of nano Y2O3 has significantly improved the hardness of the A356 alloy from 60 HV to 108 HV. A considerable increment in the YS and TS of the A356 alloy is observed with the of Y2O3 and found to further improve with UT. However, small reduction in ductility is observed with the addition of Y2O3 as well as ultrasonic treatment.

Sign in / Sign up

Export Citation Format

Share Document