- Open Access
- Total Downloads : 8
- Authors : Ankit Mittal, Ram Narayan Muni
- Paper ID : IJERTCONV1IS02066
- Volume & Issue : NCEAM – 2013 (Volume 1 – Issue 02)
- Published (First Online): 30-07-2018
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License: This work is licensed under a Creative Commons Attribution 4.0 International License
Fabrication and characterization of Mechanical Properties of Al-RHA-Cu Hybrid Metal Matrix Composites
Fabrication and characterization of Mechanical Properties of Al-RHA-Cu Hybrid Metal Matrix Composites
1Ankit Mittal, 2Ram Narayan Muni
1Haryana Engineering College Jagadhri (Haryana) India
2Department of Mechanical Engg, Swami Devi Dyal Institute of Engineering and Technology Barwala, (Panchkula) India
Abstract: Metal matrix composites are engineered materials with a combination of two or more dissimilar materials to obtain enhanced properties The widwspread acceptance of particulate metal matrix composites(mmc) for engineering application has been hindered by the high cost of producing components Advance composite materials metal matrix composite is gradually becoming very important materials in manufacturing industries e.g. aerospace, automotive and automobile industries due to their superior properties such as light weight, low density, high strength to weight ratio, high hardness. In the present investigation Al(6061) alloy was used as the matrix and rice husk ash and copper as reinforcements. The RHA used here because it is the only agricultural waste containing largest amount of silica in it. And it is abundantly produced in india every year. For increasing wettability between metal matrix and reinforcing particles magnesium is used here. The hybrid metal matrix composite was produced using stir casting techniques. The rice husk ash were added in 8%, 16%, 24%, 32% by weight and copper 3% by weight to the molten metal. The MMCs bars are prepared with varying the reinforced particles by weight fraction and with/without copper. It was observed that specimens containing copper shows improved values for Tensile strength than specimens containing only rice husk ash. The tensile strength increased linearly with increasing the weight percentage of reinforcing particles.
Keywords: MMC, Al6061, RHA,
The aim of designing metal matrix composite materials is to combine the desirable attributes of metal and ceramics The addition of high strength, high modulus refractory particles to a ductile metal matrix will produce a material whose mechanical properties are intermediate between the matrix alloy
and the ceramic reinforcement Metals have a useful combination of properties such as high strength, ductility, and high temperature resistance, but sometimes some of them have a low stiffness value, whereas ceramics are normally stiff and strong, but brittle For example, aluminium and silicon carbide have very different mechanical properties with Youngs moduli of 70 GPa and 400 GPa, coefficients o f thermal expansion o f 24 x 106/Â°C and 4 x 10'6/Â°C , and yield strength of 350 MPa and 600 MPa By carefully controlling the relative amount and distribution of the ingredients of the composites, as well as the processing conditions these properties can be further improved [1,6,7]Aluminum and its alloys normally solidify in columnar structure with large grain size which results in deterioration of their surface quality and mechanical strength. the influence of Cu addition to commercially pure aluminum results in in improvement on microstructure, microhardness, grain size, impact energy, strain, mechanical behavior Fatigue resistance is an especially important property of Al-MMC, which is essential for automotive application. These properties are not achievable with lightweight monolithic titanium, magnesium, and aluminium alloys. Aluminum-silicon carbide metal matrix composite has low density and light weight, high temperature strength, hardness and stiffness, high fatigue strength and wear resistance etc. in comparison to the monolithic materials [3,10] Fine grain size is often desired for high strength. Fine particles may be added to increase strength and phase transformations may also be utilized to increase strength. Mechanical properties of Al-Cu alloys depend on copper content. Copper is added to aluminum alloys to increase their strength, hardness, fatigue and creep resistances and machinability. Some researchers have been studied that the addition of copper and/or silicon carbide to the Al4wt%Mg metal matrix tends to improve the machinability of aluminum metal matrix material as aluminum metal is very soft. A significant reduction in torque and thrust force during dry drilling was observed as copper content increased in the metal matrix Similarly, the
addition of silicon carbide particles improves the machinability of the Al-Mg metal matrix.
1.1. Why RHAthe rice husk is only agro residue having maximum siliceous ash content and available in dry form.Rice husk (RH) is an agricultural waste material abundantly available in rice-producing countries. They are the natural sheaths that from on rice grains during their growth. Removal during the refining of rice, these husks have no commercial interest. The annual rice husk production in India amounts is generally approximately 12 million tons. Rice husk is generally not recommended as cattle feed since cellulose and other sugar contents are low. Worldwide production of rice husk is about 120 million tons per year. That makes the rice husk one of the largest readily available but also one of the most under- utilized resources. Increase of environmental awareness has led to a growing interest in researching ways of an effective utilization of rice by-product, from which rice husk is particularly valuable due to its high content of amorphous silica .But it is interesting to note that rice husk contains 20% ash, 22% lignin, 38% cellulose, 18% pentosans and 2% moisture. It is felt that the value of this agricultural residue can be upgraded by bonding with resin to produce composite suitable for tribological applications.
1.2Why Stir Casting
In this study stir casting is accepted as a particularly promising route, currently can be practiced commercially. Its advantages lie in its simplicity, flexibility and applicability to large quantity production. It is also attractive because, in principle, it allows a conventional metal processing route to be used, and hence minimizes the final cost of the product. This liquid metallurgy technique is the most economical of all the available routes for metal matrix composite production
In the present study, rice husk was procured from local sources in Haryana (India) and was thoroughly washed with water to remove the dust and dried at room temperature for 1 day. Washed rice husk was then heated to 200 Â° C for 1 h in order to remove the moisture and organic matter. During this operation, the color of the husk changed from yellowish to black because of charring of organic matter. It was then heated to 600 Â° C for 12 h to remove the carbonaceous material.After this operation the loss of ignition in
RHA occur.After this operation, the color changed from black to grayish white. The silica-rich ash, thus obtained, was used as a filler material in the preparation of composites. Chemical composition of the rice husk ash after the above treatments is shown in Table 1 and Table 2.Initially 8.7kg of rice husk was taken and 1.8 kg rice husk ash was obtained.it was approximately 22 percent of initial rice husk weight.figure 1 shows image for rha.
2.1 Loss of ignition
10g of ash heated at 700-800Â°C for 1.5 hour Weight of ash obtained after heating for 1.5 hour was 6.7g. Hence loss of ignition(10g- 6.7g=3.3g)approximately30%
Figure 1 Rice Husk Ash
Figure 2: EDX Spectrum for RHA
Figure 3: Edx Spectrum For RHA
Figure 4 SEM IMAGE OR RHA
Figure 5 SEM IMAGE FOR RHA
Figure 6 SEM IMAGE FOR RHA
Figure 7 XRD Plot for RHA
In this Study Al6061 alloy with theoretic density 2.7g/cm3 is used as matrix material and RHA of density 2.2g/cm3 is used as reinforcement. Copper(Cu)of density 8.96g/cm3 is also added to impart certain properties like hardness, and tensile strength .The chemical composition of AL6061 is shown in table. Test specimen are made which are classified based on wt%(8,16,24,32)+3%wt of copper and without copper.
Chemical Analysis Of Rice Husks
Table a: Element Analysis Mass Fraction %
Table b : Chemical Composition Of Al6061
Compositional Analysis Of Rice Husks
Table c: Compositions Mass Fraction (%)
Ferric oxide (Fe2O3)
Magnesium oxide MgO)
Initially Al6061 Al alloy was put into the crucible made of graphite.the alloy inserted was then heated to about 750Â°c till the entire alloy was melted. The RHA prepared was used as a reinforcement material here is preheated to 850Â°c for 1 hour before mixing in melt.Simultaneously,3 wt% of magnesium was added to improve the wettability between rice husk ash particules and aluminium particles.the magnesium metal turnings are used here.if magnesium was not added then it was noticed that reinforcing particles were rejected. the copper is melt separately at about 1100Â°c. the copper metal turnings are used here. The molten metal was stirred to create a vortex and the particulates were introduced. The molten metal was placed below the stirrer and stirred at approximately 600 rpm. The stirrer used here was made of steel. The preheated RHA particles are than added slowly at constant rate of 5g/s.The stirring was continued for another 5minutes after completion of particle feeding.the mixture was then poured to mold which was also preheated to 550Â°c for 20 min. to obtain uniform solidification.by using this process 8,16,24 and 32% by weight RHA with copper and without copper particle reinforced composites are produced. the cavity formed in sand by mold was sprayed out with nitrogen gas to reduce casting defects.the pattern used here are of wood .
Compositions of sample prepared
Pictures of prepared casting specimen
Diamension of prepared specimen-40*40*170
values than specimens without copper.Graph shows readings in HV.
150 TENSILE STRENGTH
RESULT AND DISCUSSION
5.2 Tensile Strength measurement
The tensile strength test was carried out on Universal Testing Machine at CITCO The result of tensile strength measurement on prepared composites are shown. The result reveals that percentage of rha increases mechanical properties like Tensile Strength.but specimen with copper shows greater Table for Results
AL6061,RHA and copper composites were prepared by stir casting technique.
Thr tensile strength of prepared composites are increased by increasing rice husk ash and copper content.
Addition of rice husk ash paricles in aluminium matrix can lead to production of economic
50 without copper
RHA wt %
Mg wt %
8%RHA 16%RHA 24%RHA 32%RHA
composites with improved tensile strength.The addition of copper further increase tensile strength
.addition of copper does not affect much on economics of low cost aluminium and rha composites.these composites can find application in automotives like piston,cylinder liners and connecting rods. These composites can also find application where light weight materials are required with good hardness and strength
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