Mechanical Properties of Al7075 Hybrid Metal Matrix
Composites as a functionality of SiO2 % in the RHA
HARISH MUGUTKAR1, N. TAMILOLI2, VISHALDATT V KOHIR3
1Research Scholar, Department of Mechanical Engineering, Koneru Lakshmaiah Education
Foundation, deemed to be University, Green Fields, Vaddeswaram, Guntur, INDIA.
1Assistant Professor, Department of Mechanical Engineering, Anurag University, Hyderabad,
INDIA.
2Department of Mechanical Engineering, Koneru Lakshmaiah Education Foundation, deemed
to be University, Green Fields, Vaddeswaram, Guntur, INDIA.
3Department of Mechanical Engineering, Khaja Bandanawaz University, Kalaburagi, INDIA.
Abstract: Hybrid metal matrix composites are wide in applications due to their improved
mechanical properties. Where the optimum selection of reinforcements becomes necessary
for determining the feasibility of producing high-performance metal matrix composites with
low cost. Consequently, in Al7075, a hybrid metal matrix composite (MMC) with boron
carbide and rice husk ash was reinforced. This current research determines the effect of
heating temperature on the production of rice husk ash, and it was discovered that the
temperature effect improved the SiO2 content of the rice husk ash (RHA). In addition, the
deposition method of RHA into the AI7075 substrate was used as a variable, and the effects
on the microhardness and tensile properties of the resultant were investigated. The introduced
hybrid MMC was reinforced with 2% boron carbide particles and 5%, 10%, and 15% RHA
respectively using the stir casting technique. Hence, mechanical performances like tensile
strength, compressive strength, impact tests, and hardness tests were performed efficiently.
Keywords: Hybrid Metal Matrix Composite (HMMC), Stir casting, Mechanical Properties,
Rice Husk Ash.
Received: June 28, 2021. Revised: March 21, 2022. Accepted: April 17, 2022. Published: May 11, 2022.
1. Introduction
In recent years, the development of new
materials and their properties has been
most important in the field of
manufacturing. In the last few decades, the
improvement in the materials world has
increased, and new materials with new
characteristics have come into existence.
The improvement in new materials has
shifted the development and research
towards the manufacturing of composite
materials. Nowadays, researchers are very
much interested on hybrid composite
materials. Hybrid composites are made of
two or more reinforcement materials with
significant properties like physical and
chemical to form a new material with
better characteristics than the parent
material. The selection of various
reinforcement materials mainly depends
on the type and application of the matrix
material. Reinforcement materials play the
main role in changing the physical and
mechanical properties of the matrix in
composites. Depending on the need and
type of the application, the reinforcement
material can be selected. The
reinforcement materials can be metals,
non-metals, ceramics. Nowadays, most
researchers are focusing on the usage of
industrial waste as reinforcement
materials. The various handling methods
for the manufacturing of composites by
utilising by-products like fly ash, RHA,
coconut shell, etc., produced by various
industries, which can reduce pollution,
wastage of the materials, and improve the
properties of the matrix materials. The
performance characteristics of the
materials also depend on the chemical
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composition of the reinforcement materials
and how the composite material is being
processed so that there should be an
effective bond between the parent material
and the reinforcement material [1]. The
uniform distribution of Mg in Al MMC is
achieved by rolling, and it was observed
that the effect of homogenization on the
hardness of the sample is directly
proportional [2]. The characterization of
AA6061 with SiC. It was witnessed that
the spread of the particles was clean
without any reaction, and the increase in
content of reinforcement material has
changed the behaviour of the matrix
material from ductile to brittle. Metal
Matrix Composites (MMCs) can be
processed using metal/metal alloys as
matrix and any extra material as
reinforcement material which may be
metal, non-metal or ceramics [3]. The
experiment was carried out on Al6061
matrix material. It was observed that with
an increase in the addition of bamboo leaf
ash has an inverse effect on the hardness
of the material. The most common method
for processing MMCs is the liquid
processing method, wherein the matrix
material is melted and the pre-heated
reinforcement material is added to it to
form the composite material. Different
researchers have studied the behaviour of
MMCs by adding various reinforcement
materials [4]. has investigated on
mechanical behaviour of HMMC with
Al7075 as matrix material and Gr and B4C
as reinforcement materials, with the rise in
wt% of B4C reinforcement material there
was major rise in hardness and tensile
strength of the MMCs and decreased the
malleability of the material [5]. The
mechanical behaviour of HMMC with
Al7075 as the matrix material and Gr and
SiC as reinforcement materials has been
inspected. The addition of SiC particles
has improved the mechanical properties
and decreased the percentage elongation of
the prepared sample [6]. The researchers
conducted a study on the mechanical and
wear properties of Al7075/SiCp and
Al6061/TiCp composites, and it was
discovered that wear increased with the
increase in particle size of SiC, and
brittleness improved with the addition of
Nano particles [7][8]. The
AA6061/B4C/Gr composite is processed,
which has resulted in an improvement in
hardness [9]. The research carried out in
the addition of SiC, B4C, Gr, and others as
reinforcement materials has resulted in
changes in the properties of the base
material, where very few attempts have
been made to use industrial waste as the
reinforcement material. The studies made
by using RHA as the reinforcement
material have also shown an improvement
in the mechanical and physical properties
of the prepared composite, which is mainly
due to the SiO2 content in it. The current
investigation is through describing the
effect of SiO2 content in RHA on the
behaviour of Al Matrix Hybrid
Composites [10-15]. Aluminium alloy
composite materials have great
strength,hardness, stiffness, thermal
stability, corrosion and wear resistance,
and fatigue life, making them the best
choice for industrial applications [16-19].
The ability of a material to withstand load
before fracture and elongation to fracture
is determined by its tensile strength. The
energy stored to fracture is measured by
impact strength. Wear resistance is a
measurement of the deterioration of a
material over time.Hence, the presence of
reinforcement, size, shape, volume
percentage, and distribution all have an
impact on the mechanical and tribological
properties of hybrid composites[20-23]. As
a result, there is a need to develop a
composition that should achieve a higher
% of SiO2 in Al7075 Hybrid Metal Matrix
composites.
The contribution of this paper involves the
following,
Al7075 with boron carbide and rice
husk ash were used to reinforce a hybrid
metal matrix composite (MMC).
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The stir casting technique has been
used to develop a hybrid MMC with boron
carbide particles.
Evaluate the mechanical
performance, as well as tensile strength,
compressive strength, an impact test, and a
hardness test.
The remainder of the paper has been
organized as follows, out of which section
1 is the introduction: section 2 presents the
recent literatures; section 3 depicts the
detailed description of the proposed
methodology; section 4 discusses the
implementation results; finally, section 5
concludes the paper.
2. Literature Survey
Imran, et.al.[24] Aluminum-7075 series
alloys are extensively used in
transportation applications such as
aerospace, aviation, marine, and
automobiles due to their good mechanical
qualities, low density, and high strength-
to-density ratio. Where, the current review
focuses on the mechanical characteristics,
and corrosion behaviour of Al-7075 metal
matrix composites (AMMCs) with desired
reinforcements. Hence, the goal is to
review the manufacture of aluminium
metal matrix composite materials by
mixing alloys and reinforcements.
Devaganesh, et.al. [25] The research
focuses on the fabrication of Al7075 metal
matrix composites (MMC) with silicon
carbide ceramic particles and several other
solid lubricants for use in piston
development. The casted specimen is
composed of 90 wt. percent Al7075 alloy
and 5 wt. percent SiC, which must be kept
constant, as well as modifying the kind of
solid lubricants: graphite, hexagonal boron
nitride (hBN), and molybdenum disulfide
(MoS2) with 5 wt. percent. The stir casting
technology is used to manufacture hybrid
Al7075 composites.
Arunkumar,et.al. [26] Stir Casting was
used to create a hybrid Aluminium (Al)
metal matrix composites using Al 7075
(Aluminium alloy 7075) reinforced with
Titanium Carbide (TiC), Graphite (Gr),
and Alumina (Al2O3). A pin on disc
device was used to perform a dry sliding
wear test. The Pin-on-Disc test was
performed in accordance with the ASTM
G99 standard. The wear test was designed
using Taguchi's L8 (2x4) orthogonal array
and parameters such as 20 N and 40 N of
applied load, reinforcements of 4 percent
and 6 percent TiC, 6 percent and 9 percent
Gr, and 7 percent and 8 percent Al2O3.
Subramaniam, et.al.[27] The current
study describes the production and testing
of hybrid aluminium matrix composites'
mechanical characteristics (HAMC).
Aluminium 7075 (Al7075) alloy was
strengthened with boron carbide (B4C)
and coconut shell fly ash particles (CSFA).
Stir casting was used to create Al7075
matrix composites. The Al7075 HAMC
samples were made with varying weight
percentages of (0, 3, 6, 9, and 12wt.
percent) B4C and 3wt. percent CSFA.
Hardness, tensile strength, and elongation
are the mechanical qualities mentioned in
this study.
Khare, et.al. [28] The current study
intends to evaluate the mechanical
properties of an AA7075 hybrid composite
reinforced with aluminium oxide (Al2O3)
and boron carbide (B4C). In this study,
composites are created in two stages: The
Al2O3 composites were created and their
mechanical properties were examined in
the first stage. To evaluate the effect, the
reinforcement weight percentage (wt%) of
Al2O3 with the highest tensile strength,
hardness, flexural strength, and impact
energy is chosen and reinforced with a
varied weight percentage of B4C.
Singh P,et.al.[29] The proposed study
will examine the tribological behaviour of
ZA-27 alloy augmented with low-cost
eggshell ash (ESA) and boron carbide
(B4C) particles using a stir casting process
to create hybrid metal matrix composites.
The percentage of ESA and B4C particles
introduced ranges from 0 to 5 wt.
Composites are being examined for
density, porosity, and microhardness.
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Jayendra, et.al.[30] Aluminium-based
metal matrix composites have a wide
range of applications in aerospace,
defence, automobiles, sports equipment,
and electronics. Al 7075 is a lightweight
castable alloy with intermediate hardness
and strength that is used in automotive and
aerospace. In general, adding refractory
reinforcement improves the material's
hardness, tensile strength, and high-
temperature qualities.
Raju, et.al.[31] Aluminium is the
matrix metal in Al-based MMC, and it has
qualities that are important to the
automobile industry. Some of these
characteristics are a high strength-to-
weight ratio and lightweight. In this paper,
we attempt to develop an aluminium-based
metal matrix composite (MMC) reinforced
with natural fibre ashes. We use fine ashes
of sugarcane (bagasse), groundnut shell
ash (GSA), rice husk ash (RHA), and
coconut shell (Jute), and different effects
are investigated for different percentages
of reinforcing material produced by
burning in a free atmosphere.
Muni, et.al.[32] Metal matrix
composites (MMC) are gaining popularity
for use in the defence, and automotive
industries. Materials used in these
applications must be lighter in weight and
more resistant to wear than conventional
materials. Aluminium hybrid composites
are a new category of metal matrix
composites that meet the latest
requirements of modern technological
applications. These needs are a result of
increased mechanical features such as
lightweight and high wear resistance,
adaptability to traditional processing
techniques, and the possibility of lowering
production costs.
Sharma, et.al.[33] Because of its vast
range of uses, the demand for and
consumption of metal matrix composites
(MMCs) is growing all over the world.
There is a constant need in businesses to
develop stronger lightweight materials
with high efficiency and performance
across a wide range of industries.
Aluminium metal matrix composites
(AlMMCs) are an asset for product
producers who require lightweight,
medium strength, and low-cost materials.
Sharma, et.al [34] To investigate the
influence of graphite particle addition on
the characteristics of AA6082 metal matrix
composites made using the traditional stir
casting method. The percentage of
reinforcement was increased by 3% steps
from 0% to 12%. The results showed that
the inclusion of graphite particles reduced
the micro-and macro-hardness by 11.11 %
and 10.44 %, respectively.
Pitchayyapillai, et.al [35] Due to its
appealing properties such as high ductility,
high conductivity, light weight, and high
strength to weight ratio, aluminium Hybrid
Reinforcement Technology is a response
to the dynamic ever-increasing service
requirements of industries such as
transportation, aerospace, automobile, and
marine. An attempt has been made in this
evolution to explore the wear rate of
Al6061 hybrid metal matrix composite
reinforced with hard ceramic alumina (4,
8, and 12 wt. % of Al2O3) and soft solid
lubricant of molybdenum disulphide (2, 4,
and 6 wt. % of MoS2).
Nallusamy,et.al [36] The stir casting
procedure was used to create the
composites.All three composites were
hardness and wear tested using a Brinell
hardness testing machine and a pin on disc
wear test device,
respectively.Consequently, the specimens
were also examined using an inverted
microscope to evaluate their
microstructures, and it was determined that
the reinforcement was uniformly
distributed in the primary matrix without
agglomeration.
Ashwath,et.al[37] The effects of
reinforcement materials such as SiC and
Al2O3 on the mechanical characteristics of
composites produced using traditional
methods and powder metallurgy are
compared and described. The researchers
findings on the effect of reinforcement
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material % on the overall properties of
MMCs are provided.
Arora,et.al[38] The use of industrial-
agro wastes as reinforcements in the
development of composites is a recent
trend in the world of material research.
The current study comprises the creation
of AA6351 mono-composites with various
weight percentages (2wt.%, 4wt.%, 6wt.%,
and 8wt.%) of silicon carbide (SiC) and
rice husk ash (RHA) as reinforcement
utilising the stir casting technique.
Nayak,et.al [39] aluminium matrix
reinforced with varying percentages of
SiCp, Graphite, and Zirconia. These
reinforcement materials were chosen for
their superior mechanical and tribological
qualities.Where the densities of graphite
and silicon carbide are low. Silicon carbide
offers high strength, hardness, and thermal
shock resistance.
Reddy, et. al[40]To improve
mechanical characteristics and wear
resistance, ceramic particles were
amalgamated with an aluminium alloy. Al-
7075/Al2O3/SiC hybrid MMCs were
created by reinforcing 2%, 3%, 4%, and
5% Al2O3 particles and 3%, 5%, and 7%
SiC particles. The uniform dispersion of
reinforcing particles inside the base matrix
was evaluated using microstructural
analysis. The results show that increasing
the wt.% of ceramic particles improves the
mechanical characteristics of hybrid
MMC.
From the survey, [24] Aluminum-7075
series alloys are widely employed in
transportation applications due to their
mechanical properties, low density [25],
and development and testing of hybrid
aluminium matrix composites. [26]
Composites are also being tested for
density, porosity, and microhardness. [27]
The composite's properties are determined
not only by the reinforcement materials
utilized [28-35]. As a result, intelligent
techniques are proposed to develop
mechanical properties in metal matrix
composites. The material and processing
of the rice husk ash are discussed in the
following section.
3. Material and Processing of
RHA
The base material is (Al 7075), the
composition of which is described in Table
1, and the filler material is boron carbide
and rice husk ash. Where, the aluminium
alloy composites were created using a high
vacuum casting process with varying wt %
particulate filler. Consequently, rice ash is
warmed at C before being added to
7075 Alloy in this method. Preheating
filler materials is required to avoid
moisture infiltration into the sample;
otherwise, particle agglomeration is
enhanced. Also, the aluminium metal
matrix was melted in graphite using a
vacuum casting furnace at 150-200 degree
Celsius. Whereas, the selection of the
material for the preparation of the
composite is based on the type and
application of the composite prepared. The
current work is aimed at improving the
behaviour of the Al-7075 as a matrix
material with B4C as shown in fig. 1, and
RHA as reinforcement material.
Table 1 provides the detailed elements in
Al7075.
Table 1: Elements in Al7075
Element
Zn
Cr
Fe
Mn
Si
Ti
Mg
Al
%
6
0.2
0.5
0.3
0.2
0.4
2.9
bal
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Figure 1: B4C Particles/Powder
Rice Husk Ash (RHA) is prepared by
obtaining rice husk from a local rice mill
and cleaning it with normal water to
remove all undesired elements and soluble
matter. It is then allowed to dry at room
temperature for 2-3 days. RHA is obtained
when heating the dried husk. Therefore,
the proposed research analyses the
processing of RHA, which has resulted in
the development of a change in the
composition of SiO2 content in RHA.
Figure 2: Flow Chart for processing RHA for sample (RHA)
Fig. 2. represents the flow chart for processing of RHA for sample (RHA) at different
temperatures.
Table 2: Composition of RHA for Sample (RHA)
Eleme
nt
LOI
Na2
O
Mg
O
Al2
O3
SiO
2
P2O
5
K2O
CaO
TiO
2
V2O
5
Mn
O
Fe2
O3
%
62.5
6
0.21
4
0.26
7
0.05
4
34.4
4
0.20
1
1.64
3
0.13
2
0.00
6
0.00
1
0.05
6
0.04
5
Table 2 give the composition of RHA processed as discussed in the flow chart
respectively.
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Figure 3: RHA Sample
Fig.3. shows the rice husk ash sample. The preparation of composite specimens is shown
in the below section.
3.1. Preparation of Composite
Specimens:
The preparation of HMMC is carried out
using a stir casting setup which uses a
liquid metallurgy route technique.
Primarily, aluminium alloy is charged into
the crucible and heated up to till the
complete aluminium alloy present in the
invessel changes its phase. A stirrer made
of stainless steel is dipped in the molten
metal and it is stirred at 500 rpm. Now the
reinforcement materials are added slowly
into the vessel containing molten metal at
a constant rate as per the weight percent
discussed in table 3, and gradually the
stirring speed is increased to 700 rpm. The
mixing is done by using a stirrer and
continues for 5 minutes after the addition
of reinforcement material. The mixture is
poured into a preheated mould and
allowed for solidification. A similar
procedure is carried out for the remaining
weight percentage of reinforcements.
(a) (b)
Figure 4: (a) Stir Casting and (b) Electrical Furnace Equipment
Stir casting was used to make the
Al7075 aluminium alloy reinforced with
5%, 10% and 15% RHA and 2% boron
carbide particles. Initially, 3 kg of
Aluminium 7075 was placed into a
graphite crucible and melted in a pit
furnace at . As the aluminium metal
is heated, 2 g of Mg was added to the melt
as a wetting agent to reduce casting
fluidity and molten aluminium surface
tension. Rice husk ash particles were
roasted to for 1 hour to remove
moisture. Therefore, the graphite stirrer
was lowered, and the preheated RHA at
was slowly charged into the melt
for uniform distribution. Hence, the stir
casting manufacturing setup is depicted in
Fig.4.
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.
(S1) (S2)
(S3) (S4)
Figure 5: Samples Prepared using Stir Casting
The samples (S1), (S2), (S3), and (S4) are manufactured utilising a stir casting
manufacturing technique, as shown in Fig.5.
Table 3: Wt % of Reinforcement Material
Designation
Composition
S0
Al7075
S1
Al7075 + 2% B4C
S2
Al7075 + 2% B4C + 5% RHA
S3
Al7075 + 2% B4C + 10% RHA
S4
Al7075 + 2% B4C + 15% RHA
Table 3 shows the Wt% of
Reinforcement Material with various
compositions and designations. The
hardness analysis results demonstrate that
Al7075+2% B4C+15% RHA has a greater
hardness value and thus a superior
hardness attribute. The increase in
hardness was attributed to an increase in
the fraction of hard and brittle phases of
rice husk ash particles in the aluminium
alloy.
4. Results and Discussion
The results of the proposed framework are
presented in this section. The performance
was assessed using mechanical properties
such as tensile property, percentage
elongation, impact test, hardness (BHN),
and compressive strength.
4.1. Tensile Property:
The variation of tensile properties of the
prepared composite with different wt% of
reinforcement material is shown in fig.6.
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Figure 6: Tensile test specimens as per ASTM E8M04 standards.
The tensile strength with varied weight percentages of reinforcement material is shown in
table.4.
Table 4: Tensile strength with different wt. % of Reinforcement Material
Designation
Tensile Test
(N/mm2)
S0
86.826
S1
102.882
S2
186.209
S3
178.411
S4
191.212
Figure 7: Tensile Test
From Table 4, the above graph is plotted for various designations S0, S1, S2, S3 and S4.
As shown in fig.7, increasing the sample size increases the tensile values.
4.2 Percentage Elongation:
The difference in percent elongation of the
prepared composite with varying weight
percentage of reinforcement material is
shown in Table 5. The percent elongation
increased with an increase in the weight
percentage of RHA.
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Table 5: % elongation with different wt. % of Reinforcement Material
Designation
% Elongation
S0
1.16
S1
2.52
S2
1.8
S3
4.04
S4
4.6
Figure 8: Elongation
From Table 5, the above graph is
plotted for various designations S0, S1, S3
and S4. As shown in fig.8, increasing the
sample size increases the elongation (%).
At S4 the influence of occurs
4.5%,which is 0.5% higher than S3,which
is 2% higher than S1.
4.3. Impact Test:
The toughness of the material can be
observed by performing an impact test.
Usually, the notch type of specimen is
used to carry out impact tests. The notch
assists as a stress concentrator. In the
present study, the Izod impact testing
machine and v-notch made only on one
side of the specimens were used to study
the impact energy of the prepared
composites. This study describes the
energy that materials can absorb. The
impact stress of aluminium hybrid
composite is shown in fig.9.
Figure 9: Impact test specimens as per ASTM E8M04 standards.
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The impact energy with varied weight percentages of reinforcement material is shown in
table.6 Table 6: Impact energy of different wt. % of Reinforcement Material
Designation
Impact Test (J)
S0
4.00
S1
4.00
S2
4.00
S3
6.00
S4
6.50
Figure 10: Impact Test
From Table 6, the above graph is
plotted for various designations S0, S1, S3
and S4. As shown in fig.10, increasing the
sample size increases the impact test. At
S4 the influence of occurs 6.5J,which
is 0.5J higher than S3,which is 2.5J higher
than S1.
4.4 Hardness Test:
The deviation in hardness of the unlike
combination of Al-HMMC was evaluated
and shown in figure11. Specimens are
tested on a Brinell hardness testing
machine, which usually consists of a
diamond ball indenter. It was observed that
the hardness values of the HMMC were
reduced due to the presence of porosity in
the specimens.
To analyse the strength of the material the
below equation follows,
(1)
Where R be the load in kgf.
E be the steel ball diameter in mm.
e be the depression diameter in mm.
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Figure 11: Brinell Hardness Test
The Hardness value with varying weight percentages of reinforcement material is shown
in table.7.
Table 7: Hardness value of different wt. % of Reinforcement Material
Designation
Hardness (BHN)
S0
125.33
S1
121.33
S2
108.33
S3
107.67
S4
105.8
Figure 12: Hardness
From Table 7, the above graph is
plotted for various designations S0, S1, S3
and S4. As shown in fig.12, increasing the
sample size increases the hardness(BHN).
At S0 the influence of occurs
125.33(BHN), which is 3.5(BHN) higher
than S1.
4.5 Compression Behaviour:
The variation of compression strength by
adding RHA is displayed in fig 13. After
the investigation, the results showed that
the compressive strength was increased
with a rise in the weight% of RHA
particles. The maximum compressive
strength was found to be 15% of RHA in
the hybrid composite, which is due to the
higher percentage of silica content in the
MMC.
Figure 13: Impact test specimens as per ASTM E8M04 standards.
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The Compressive test with varied designation of reinforcement material is shown in
table.8.
Table 8: Compressive strength of different wt. % of Reinforcement Material
Designation
Compression Test (Mpa)
S0
420.192
S1
514.128
S2
547.824
S3
625.536
S4
650.69
Figure 14: Compression Test
From Table 8, the above graph is
plotted for various designations S0, S1, S3
and S4. As shown in fig.14, increasing the
sample size increases the compression test.
At S4 the influence of occurs
650(Mpa),which is 10(Mpa) higher than
S3.
This section compares the performance
of the proposed work with existing works
based on the mechanical properties of
AI7075 to ensure the effectiveness of the
proposed methodology.
Figure 15: Comparison of Impact Test.
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Fig.15. shows the comparison of the
impact test with known approaches such as
Al7050, Al6061, Al390, AA6063, and
A356. The proposed technique's impact
test yields better results than the other. At
Al7075 the influence of occurs 11J,
AA6063which is 1.8J lower than Al7075.
Figure 16: Comparison of Hardness(BHN)
Fig.16.depicts the comparative analysis
of the Hardness(BHN) with the existing
techniques such as Al7050, Al6061,
Al390, AA6063, and A356. The hardness
of the proposed technique achieves 130
BHN, which is 2BHN higher than
AA6063.
Figure 17: Comparison of Elongation(%)
Fig.17.depicts the comparative analysis
of the Elongation (%) with the existing
techniques such as Al7050, Al6061,
Al390, AA6063, and A356. The
elongation of the proposed technique
achieves 9.9%, which is 5.4% higher than
AI7050, which is 3.2% higher than
AI6061, which is 2.1% higher than
AA6063.
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Figure 18: Comparison of Tensile Test(N/mm2)
Fig.18.depicts the comparative analysis
of the Tensile Test (N/mm2) with the
existing techniques such as Al7050,
Al6061, Al390, AA6063, and A356. The
tensile test of the proposed technique
achieves 198 (N/mm2) which is 4(N/mm2)
higher than A390.
5. Conclusion
This research proposed a technique for
determining the mechanical properties of
Al7075-B4C–RHA hybrid metal matrix
composite. The manufacturing of low-cost
hybrid aluminium matrix composites with
rice husk ash as a complementing
reinforcement with boron carbide showed
a significant advantage due to the
enhanced mechanical properties of the
generated hybrid composites. The hardness
of composites increased as the matrix
reinforcement content increased by 125.33
BHN. The addition of reinforcing particles
B4C and RHA to aluminium7075 boosts
the tensile strength of composites. Also,
the matrix reinforcement content of
composites is increased to achieve a 6.5 J
impact energy. B4C and rice husk ash both
exhibit 4.6 % composite elongation.
According to the experimental results, the
proposed framework outperforms the
others in terms of impact testing, tensile
testing, hardness, and elongation.
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