Effect of Heat Treatment on Mechanical properties of Aluminium metal matrix composite (AA6061/MoS2)

Author(s):  
Chandra Sekhar Manda ◽  
B Surendra Babu ◽  
N. Ramaniah
2015 ◽  
Vol 787 ◽  
pp. 588-592 ◽  
Author(s):  
Radhakrishnan Ganesh ◽  
J. Saranesh Kumar ◽  
R. Satya Prakash ◽  
K. Chandrasekaran

The paper presents the results of investigation on physical, mechanical and wear properties of SiC particulate reinforced aluminium metal matrix composite. The influence of reinforced ratios of 10, 15 and 20 wt. % of SiCp on mechanical properties and wear characters was examined. The effect of load and sliding velocity on wear behavior of composite was studied. It was observed that increase of weight fraction of reinforcement produced better physical and mechanical properties such as density and hardness with 37 µm SiC reinforced composite inspite of increased density the hardness drops above the critical sintering temperature of 550°C due to crazing of the matrix. With increased size of SiCp especially with higher temperature, density and hardness doesn’t supplement each other. Possible pooling/agglomeration in the case of medium and coarse sized reinforcement account for this. Wear decreases with increase in sintering temperature for 23 and 37 µm SiCp reinforced composites where as it increases for 67 µm SiCp reinforced composites. This could be attributed to formation of silanium compound contributing to discrete hardening of matrix. Wear tends to drop with sliding velocity being less contact between the pin and the disc but increases with normal load acting on the composite.


2017 ◽  
Vol 51 (30) ◽  
pp. 4261-4271 ◽  
Author(s):  
Shashi Prakash Dwivedi ◽  
Satpal Sharma ◽  
Raghvendra Kumar Mishra

The AA2014/5 wt. % carbonized eggshells metal matrix composite used in this study was fabricated by electromagnetic stir casting technique and immediately extruded on universal testing machine at 60 MPa using cylindrical H13 tool steel die coated with graphite to avoid upper flow of eggshells particles and to improve wettability of eggshells with AA2014 alloy. Microstructures of composites show some agglomerations in non-extruded samples while uniform distribution of carbonized eggshell particles. Optimum combination of precipitation hardening parameters achieved using response surface methodology to further improve the properties of AA2014/5 wt. % eggshell composites. Optimum values of solutionizing time, aging temperature and aging time were found to be 4.5 h, 250℃ and 13.5 h, respectively. More grain refinement of extruded AA2014/5 wt. % eggshell composites were observed after heat treatment at optimum precipitation hardening parameters. After heat treatment, fractographs of the AA2014/5 wt. % eggshells composite showed that fracture is dominated by trans-granular type. Density of the AA2014 is 5% higher than AA2014/5 wt. % eggshells metal matrix composite. It is observed that mechanical properties improve when carbonized eggshell particles are reinforced in matrix AA2014 aluminium alloy. After the heat treatment at optimum precipitation hardening parameters, mechanical properties are further improved.


2019 ◽  
Vol 18 ◽  
pp. 2461-2467
Author(s):  
Ankit Sharma ◽  
Bhuvanesh Vasudevan ◽  
Ravindran Sujith ◽  
Nitin Kotkunde ◽  
Kurra Suresh ◽  
...  

Author(s):  
R. Sathishbabu ◽  
P.K. Dash ◽  
R. Santhanakrishnan ◽  
S. Sathish

In this paper, an experimental based investigation of mechanical properties of SiC particles reinforced aluminium metal matrix composite (AMMC) manufactured by liquid metallurgy process has been carried out. The ultrasonic technique has been used for characterisation of material properties by correlating the attenuation of ultrasonic velocity with the amount of particle reinforcements. The amount of SiC particle loading has influenced the ultrasonic velocity at both manufacturing stage and forging test. The material properties like tensile strength, elongation percentage, hardness, wear resistance, impact strength and strength under different forging conditions have been significantly influenced by the weight percentage of SiC particles. The failure of AMMC specimens were characterized through SEM analysis.


Author(s):  
Umanath K ◽  
Nithyanandhan T ◽  
Adarsh Ajayan ◽  
Devika D ◽  
Gokul Prasath M ◽  
...  

Abstract Aluminium Metal Matrix Composite (AMMC) has broad uses in the medical, aerospace, and automobile industries, which have long sought lightweight materials with superior designs and improved properties to improve performance. This analysis has aimed to prepare an AMMC to investigate its machining and mechanical properties. The AMMC is produced using a stir casting process by reinforcing boron carbide and titanium with aluminium 6082. The material's mechanical properties are studied by using wear test, hardness test, and corrosion test. The wear rate increases when the load increases by varying the load and time with speed as a constant. It is found that the hardness of a material is increased due to titanium and boron carbide as the reinforcement particle in the fabricated AMMC. Using the pitting corrosion technique, the corrosion occurs on the AMMC under the estimated time at room temperature. In order to illustrate the machining characteristics of the aluminium metal matrix composite, an abrasive water jet machining process has been used. The experiments use L9 orthogonal Array using Taguchi's method and ANOVA analysis. The input parameters considered are Traverse rate, Stand-off distance, and Nozzle diameter. To find the optimum value of circularity, cylindricity, and surface roughness by varied input parameters. The respective graphs are also plotted. Scanning electron microscopic analysis was performed on the wear-tested specimen and machining surface of the material to determine the distribution of reinforced material and investigate the material's fracture mechanism. It is found that wear tracks, voids, delamination, micro pits, embedded garnet abrasive particles are located on the machined surface of the AMMC.


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