Effect of Reinforcement Type and Extrusion on the Microstructure and Mechanical Behavior of Al Alloy Composites

2015 ◽  
Author(s):  
Shanmuga Sundaram Karibeeran ◽  
Dhanalakshmi Sathishkumar ◽  
Balasubramanian Muthaih ◽  
Sivakumar Palanivelu
Keyword(s):  
Mechanical Properties ◽  
Base Alloy ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Extrusion Process ◽  
Al Alloy ◽  
Matrix Composites ◽  
Tension Tests ◽  
Cast Composites ◽  
The Matrix

Aluminum based metal matrix composites offer greater potential for light weight, wear resistant and high temperature applications. Secondary processing like extrusion results in the improvement of strength and ductility of the as-cast composites. The objective of this research is to investigate the effect of reinforcement type and extrusion process on the microstructure and mechanical properties of the hot extruded Al2014 aluminum alloy. Two different composites were made by reinforcing the alloy with 10 wt.% SiC and 10 wt.% Si3N4 particles using stir casting method. The particles were electroless Ni coated to improve the wettability of reinforcement by the matrix alloy. The composite ingots were further extruded at 475 °C with an extrusion ratio of 8:1. The microstructures and the mechanical properties of the base alloy and the composites were examined systematically. The extruded composites show more homogenous microstructure with uniform distribution of particles in the matrix alloy. Both the Al/SiC and Al/Si3N4 composites exhibited improved hardness compared to the base alloy in both as-cast and extruded conditions. It was also found from tension tests that the both the composites show higher yield strength, ductility and ultimate tensile strength (UTS) than the base alloy in the extruded condition. The reason for improvement in strength in the extruded conditions is explained in detail. Fracture surface analysis revealed the transition from brittle fracture mode in the as cast composites to the ductile fracture in the extruded condition.

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.

Mechanical Behavior of CNTs/SiCp/AZ91D Magnesium Matrix Composites

2011 ◽  
Vol 694 ◽  
pp. 635-639 ◽  
Author(s):  
Wei Xue Li ◽  
Yun Feng Nie ◽  
Dun Dong Wang
Keyword(s):  
Mechanical Properties ◽  
Casting Process ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Matrix Composites ◽  
Micro Hardness ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
Resistance To Deformation ◽  
The Matrix

AZ91D alloy composites reinforced by CNTs/SiCp were fabricated using stir casting process. The mechanical properties of the composites were tested, observed and analyzed the microstructure, the fractographs were observed and analyzed via scanning electron microscope. The results showed that CNTs/SiCp could not only refine the grains of the composites, but also bear the load of resistance to deformation. Compared with the matrix alloy, the tensile strength, the elastic modulus, the micro-hardness and the elongation rate of the composites had been enhanced significantly. But the mechanical properties would be fell down with the more addition of CNTs/SiCp.

Study on Mechanical Property of Aluminium 6061 with E Glass Fiber Reinforced Composite

2018 ◽  
Vol 877 ◽  
pp. 50-53 ◽  
Author(s):  
Vinayashree ◽  
R. Shobha
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
High Strength ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Reinforced Composite ◽  
Reinforcement Content ◽  
Glass Fiber Reinforced ◽  
The Matrix ◽  
Glass Fibre Reinforced

Aluminium composites are in predominant use due to their lower weight and high strength among the MMC’s. Aluminium 6061 is selected as matrix and E-glass fiber is selected as reinforcement. Fabrication of composite is done by stir casting method. Each fabrication carries the E-glass reinforcement content varied from 2% to 10%. The present article attempts to evaluate the mechanical properties of E-glass fibre reinforced composite and study the effect of reinforcement on the matrix alloy through mechanical properties. When compared to ascast mechanical properties the UTS has increased from 74.28 N/sq mm to 146.8 N/sq mm for a composite at 6% E-glass. The hardness of as-cast has also increased from 22 RHB to 43 RHB at 6% E-glass and the wear of composite has exhibited a decreasing tend with increase in reinforcement content along the sliding distance. The results are analyzed in certain depth in the current paper. The mechanical properties of composites have improved with the increase in the weigh percentage of glass fiber in the aluminium matrix.

Experimental Investigation of Tensile Properties and Fracture Mechanism of WCP/Cu Composites Reinforced with Different WCP Volume Fraction

2011 ◽  
Vol 415-417 ◽  
pp. 2244-2247 ◽  
Author(s):  
Feng Yan ◽  
Rong Xin Guo ◽  
Hai Ting Xia ◽  
Hai Yu ◽  
Yu Bo Zhang
Keyword(s):  
Mechanical Properties ◽  
Fracture Behavior ◽  
Volume Fraction ◽  
Copper Matrix ◽  
Matrix Composites ◽  
Fracture Surface Morphology ◽  
Test Results ◽  
Tension Tests ◽  
Tensile Performance ◽  
The Matrix

The copper matrix composites reinforced by different WCP volume fraction were fabricated via Vacuum Hot-pressed Sintering technique. The tensile performance and fracture behavior of WCP/Cu composites were studied by uniaxial tension tests and the fracture surfaces were examined by SEM. The test results of mechanical properties show that the WCP/Cu composites exhibit obvious improvement of tensile property comparing with that of the matrix. The fracture surface morphology indicate a trend that the fracture of WCP/Cu composites changes from debonding to cleavage with the increase of the WCP volume fraction.

Processing, Microstructure and Mechanical Properties of SiCp/AZ91 Mg Matrix Composites Fabricated by Squeeze Casting

2007 ◽  
Vol 546-549 ◽  
pp. 499-502
Author(s):  
X. Qiu ◽  
Xiao Jun Wang ◽  
Ming Yi Zheng ◽  
Kun Wu
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Squeeze Casting ◽  
Volume Fraction ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Magnesium Matrix Composites ◽  
The Matrix ◽  
Az91 Magnesium ◽  
Different Diameters

The fabrication processing, mechanical properties and fracture characters of SiCp/AZ91 magnesium matrix composites fabricated by squeeze casting were investigated. The SiC particles with different diameters (5μm, 20μm and 50μm) were employed as the reinforcement in the composites, the volume fraction of them was 50% in all cases. Experimental results showed that when the size of SiC particle decreased, the tensile properties of the composite increased. The tensile properties of SiCp/AZ91 composite with small particles are controlled by the properties of matrix alloy and the strength of the interface between the matrix and reinforcements, but the composites reinforced by large particles are controlled by the fracture of the particles.

scholarly journals Effect of fly ash particle reinfo rcement on microstructure, porosity and hardness in Al-(Si-Mg) cast composites

2017 ◽  
Vol 23 (1&2) ◽  
pp. 113 ◽  
Author(s):  
M.B. Harun ◽  
S.R. Shamsudin ◽  
H. Yazid ◽  
Z. Selamat ◽  
M.S. Sattar ◽  
...  
Keyword(s):  
Fly Ash ◽  
Casting Process ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Image Analyzer ◽  
Microscopy Image ◽  
Optical Microscopy Image ◽  
Cast Composites ◽  
The Matrix ◽  
Scanning Electron

The microstructure of cast Al-4Si-Mg reinforcedwith fly ash particles at various particlecontents has been studied. The composites were fabricated by stir casting process andcharacterized by optical microscopy, image analyzer, scanning electron microscopy and hardness measurements. The results showed that particle contents affected to the presence oforosities and hardness of the composites. It was observed that increasing the fly ash contentincrease the porosity in the composites, with the matrix alloy reinforced with 15 wt.% of fly ash particles having the highest porosity and lowest hardness.

Influence of Sic and Al2O3 Particulate Reinforcement on the Mechanical Properties of ZA27 Metal Matrix Composites

2019 ◽  
Vol 969 ◽  
pp. 122-127
Author(s):  
B.N. Anjan ◽  
G.V. Preetham Kumar
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Weight Percentage ◽  
Casting Technique ◽  
Fine Microstructure ◽  
Properties Of Composites

Zinc aluminum based matrix composites reinforced with SiC and Al2O3 particles have significant applications in the automobile field. Stir casting method followed by squeeze process was used for fabrication. ZA27 composites reinforced with SiC and Al2O3 particles (20-50µm) in various weight percentage (wt%) ranges from 0-10 in a step of 5 each was fabricated. OM, SEM and EDS analysis of microstructures obtained for matrix alloy and reinforced composites were performed in order to know the effect of varying wt% on physical and mechanical properties of composites. Squeeze casting technique shows better features such as fine microstructure as a result of low porosity and good bonding between matrix and reinforcement. Addition of reinforcements decreased the densities of matrix alloy. SiC reinforced composites showed better results as compared with Al2O3 reinforced ones. Hardness and ultimate tensile strength value of 10 wt% reinforced composites showed improved results.

Effect of Extrusion Parameters on Mechanical Properties of Al6061-Ni-P Coated SiC Composites

2013 ◽  
Author(s):  
Ramesh Chinnakurli Suryanarayana ◽  
Sikhakolli Ramakrishna ◽  
Ummar Khan Attaullah ◽  
Smitha Hanumantha Badnur ◽  
Kumar Saheb
Keyword(s):  
Mechanical Properties ◽  
Load Transfer ◽  
Hot Extrusion ◽  
Matrix Alloy ◽  
Extrusion Process ◽  
Systematic Investigation ◽  
Strength Properties ◽  
Industrial Applications ◽  
The Matrix ◽  
Sic Composites

Extrusion of metal matrix composites (MMCs) is a very challenging one where in the bond between the reinforcement and the matrix alloy is crucial in getting high quality extrusions for industrial applications. In recent years researchers are focusing on developing aluminium based composites with metallic coated reinforcement to achieve good interfacial bonds to ensure smooth load transfer from the matrix on to reinforcement. However no information is available as regards hot extrusion of metallic coated reinforced MMCs. In the light of the above, the present work focuses on a systematic investigation on effect of extrusion process parameters on mechanical properties of Al6061-Ni-P coated SiC composites. From the investigation, it is observed that hardness, yield and ultimate strength of Al2014-SiC (Both uncoated and Ni-P coated) composites are higher when compared with the matrix alloy for all the extrusion ratios studied (4:1,5:1,10:1,15.5:1) at a given extrusion temperature. However, the ductility of composites decreases with increase in extrusion ratios. Further, heat treatment has a significant effect on the studied mechanical properties. Increase in extrusion temperatures at a given extrusion ratio has resulted in decrease in hardness and strength properties of both matrix alloy and developed composites.

Influence of Hot Extrusion Process on the Mechanical Behavior of AA6061/SIC Composites

2011 ◽  
Vol 264-265 ◽  
pp. 141-148
Author(s):  
Amir Pakdel ◽  
Hassan Farhangi ◽  
M. Emamy
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Fracture Behavior ◽  
Density Measurement ◽  
Hot Extrusion ◽  
Stir Casting ◽  
Extrusion Process ◽  
Matrix Composites ◽  
Sic Composites ◽  
Average Size

The effect of hot extrusion process on the microstructure, mechanical properties and fracture behavior of metal-matrix composites (MMCs) of AA6061 alloy reinforced with 10 volume percent particulate SiC with the average size of 46 µm was studied. The MMC ingots were fabricated by the stir casting method and were extruded at 450°C at a ram speed of 1mm/s and at the extrusion ratios of 6:1, 12:1 and 18:1. Various techniques including metallography, density measurement, tensile testing, and SEM fractography were utilized to characterize the mechanical behavior of the MMCs. Results demonstrated that extruded composites possessed considerably lower porosity contents, higher strength, and enhanced ductility in comparison with the as-cast samples. In addition, further improvement in the mechanical properties of the extruded composites was noticed by increasing the extrusion ratio. Fractographic observations revealed that the brittle fracture behavior of the as-cast specimens was promoted by cracking of the large SiC particle clusters. Whereas, the fracture surfaces of extruded composites showed extensive tear ridge formation by initiation and growth of shallow dimples, around the cracked particles, which is characteristic of a ductile fracture process. This change in the fracture behavior and improvement in mechanical properties is attributed to the break up of particle clusters and diminishment of pores during the extrusion process.

Mechanical and Morphological Studies of Al6061-Gr-SiC Hybrid Metal Matrix Composites

2015 ◽  
Vol 813-814 ◽  
pp. 195-202 ◽  
Author(s):  
T. Lokesh ◽  
U.S. Mallikarjun
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Morphological Studies ◽  
The Matrix ◽  
Strength And Ductility

Abstract. In recent years, Aluminium alloy based metal matrix composites (MMC) are gaining wide spread acceptance in several aerospace and automobile applications. These composites possess excellent wear resistance in addition to other superior mechanical properties such as strength, modulus and hardness when compared with conventional alloys. The hybrid composites are new generation of composites containing more than one type, shape or sizes of reinforcements giving superior combined properties of reinforcements and the matrix. In the present work, Al6061 has been used as matrix material and the reinforcing materials selected were SiC and Graphite particulates of 10 to 30µm size. Composites Al6061-Gr (2- 8 wt. %), Al6061-SiC (2 -10wt. %) and Hybrid composites with Al6061 matrix alloy containing 3wt% graphite and varying composition of 2-10wt% SiCp were prepared by stir casting technique. The cast matrix alloy and its composites have been subjected to solutionizing treatment at a temperature of 530 ± 20C for 6 hours, followed by ageing at a temperature of 175 ± 20C for 6 hours. The mechanical properties of as cast and T6 heat treated composites have been evaluated as per ASTM standards and compared. Addition of Graphite particulates into the Al6061 matrix improved the strength and ductility of the composites. Significant improvement in tensile strength and hardness was noticed as the wt. % of SiCp increases in Al6061-SiC composites. Addition of Graphite into Al6061-SiC further improved the strength and ductility of hybrid composites. The heat treatment process had the profound effect in improving the mechanical properties of the studied composites. The microstructural studies revealed the uniform distribution of SiC and Gr particles in the matrix system.

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