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Abstract— Efforts are being made to investigate the mechanical characteristics of Cenosphere and e- 

galass fibres reinforced Al7075 in this current project. Cenosphere, a low-density, low-cost reinforcing 

material, is a byproduct of coal combustion in thermal power plants and is readily accessible. As a 

result, Al 7075 metal matrix with cenosphere as reinforcement can easily overcome the cost barrier 

and may serve as the best supplement with varied physical and mechanical qualities for servicing a 

broad variety of applications providing wide usage in today's world. Variations in the E-glass and 

cenosphere were used to create the specimens. The specimens used in the tensile test were 

constructed in accordance with ASTM specifications. Improved features including improved specific 

strength, specific modulus, damping capacity, and superior wear resistance may be achieved by using 

metal matrix composites (MMCs) instead of ordinary alloys. The great strength-to-weight ratio of 

aluminium composite MMCs makes them the most popular. 

 
Key words: Al7075 alloy composite, E-glass, MMCs, and short E-glass fibres 

 Chinese Traditional Medical Journal 

MECHANICAL PROPERTIES OF METAL MATRIX 

COMPOSITES CONSISTING OF AL7075, CENOSPHERE, AND 

E- GLASS. 

LUO Xin, XIE Jing, HUANG Li, GAN Wenfan, 

Department of Cardiology, Guang′anmen Hospital, 

China Academy of Chinese Medical Sciences , Community Healthcare Center of Shangzhuang 
 

 

 

Article Info 

Received: 10-04-2023  Revised: 25 -05-2023  Accepted: 12-06-2023      

 

 

 



CTMJ | traditionalmedicinejournals.com Chinese Traditional Medicine Journal | 2023 | Vol 6 | Issue 3  

1 INTRODUCTION 

Two or more unique constituent materials may 

be combined into a single component in the 

form of composite materials, which are 

engineered materials built from two or more 

discrete components. In the context of 

structural materials, a composite material is 

onethat has been synthesised or intentionally 

constructed by mixing two or more materials 

that have distinct properties. The matrix phase 

is one of the constituents, whereas the 

reinforcing phase is another. The phase of 

reinforcing is included into the matrix in order 

to provide the required property. 

For its low density, isotropic nature, cheap 

manufacturing costs, and simpler secondary 

processing like fabrication and usage than 

typically used materials, Particulate Aluminum 

Reinforced Composite Materials (PARCMs) are 

frequently employed. Al-7075's mechanical 

characteristics are now being studied in relation 

to the effects of reinforcing materials such as 

cenosphere and e-glass. The weight 

percentages of cenosphere, e-glass, and Al- 

7075 alloy in stir-casting hybrid composites 

were varied, and the castings were then 

machined to a standard test specimen size. The 

specimens are next subjected to tensile testing. 

2. THE GOALS OF CURRENT RESEARCH 

Using the stir-casting method, this research 

aims to produce an Al 7075/Cenosphere-E glass 

composite. In this method, the particulate is 

mechanically mixed into a molten metal bath 

before being transferred into a mould before 

solidification is complete. Aluminum alloy 7075 

ingots must be roasted in this method in order 

to The molten condition of the furnace. It's 

possible to use a mechanical stirrer to produce a vortex at 800-

850oC temperature. furnaces are used to preheat Cenosphere 

particles. The furnace's temperature is kept between 825 and 

855 degrees Fahrenheit. Preheated cenosphere particles and e-

glass should be added while stirring of the melt. After the 

cenosphere and E- Glass fibres have been added, the melt must 

be stirred for another 15 minutes to ensure that they are 

evenly mixed. 

To make a casting, the melt is poured into a mould that has 

been heated to a certain temperature. For mechanical testing, 

these specimens are compared to pure Al 7075. 



CTMJ | traditionalmedicinejournals.com Chinese Traditional Medicine Journal | 2023 | Vol 6 | Issue 3  

2. EXPERIMENTAL DETAILS In our 

experiments, we take the following steps: 

3. Selecting a Substance 

4. 2. Preparation of the composite 

5.  

6. 3. Testing 
 

 
1.1 Material selection 

It was made of Al 7075 alloy 

(matrix), E-glass short fibres 

(reinforcement) and cenosphere 

(reinforcement). Table 1 shows 

the chemical composition of 

Al7075. 

 
 
 
 
 

 
Table 1: Chemical Composition of Al 7075 

 
 
 
 
 
 

1.2 Composite preparation 
 

 
E-glass short fibres were utilised 

as reinforcement, and the 

percentage of E-glass short 

fibres changed from 1% to 5% 

by weight in step-by-step 

increments for the cenosphere 

concentration in the composite. For the 

production of the composite materials, a liquid 

metallurgical process using an alumina-coated 

stainless steel stirrer generated a vortex in the 

Compositio 
n 

Zn Fe Mg Mn Cu Si Cr Ti 

% 
Compositio 
n 

5.6 0.5 2.5 0.3 1.6 0.4 0.23 0. 

 



CTMJ | traditionalmedicinejournals.com Chinese Traditional Medicine Journal | 2023 | Vol 6 | Issue 3  

molten metal pool where the cenosphere 

particles were inserted. Adding a layer of 

alumina to the stirrer prevents the migration of 

ferrous ions into the molten metal from the 

stirrer's substance. 550 rpm was the rotational 

speed of the stirrer, and its depth of immersion 

in the molten metal was about two-thirds of the 

depth of the metal. The period prior For 3 to 4 

minutes, the liquid melt was degassed with 

pure nitrogen before adding the cenosphere 

particles and short E-Glass fibres. Preheated 

permanent moulds were tilt poured with the 

final slurry to set it up. 

 

Figure 3.1 Furnace 
 

 
Figure 3.2 Die 

 

 

 
Figure 3.3 pouring 

 
 
 

 
Figure 3.4 specimen after casting 

 

 
1.3 Machining 

Casted specimens must be further shaped using 

a Lathe in the Machine shop since they lack the 

requisite dimensions. Casted specimens. The 

specimen's centre section diameter must meet 

the standard before it can be tested on the 

machine 
 

 



CTMJ | traditionalmedicinejournals.com Chinese Traditional Medicine Journal | 2023 | Vol 6 | Issue 3  

Figure 3.5 Lathe machine 
 

figure 3.6 Hardness specimens 

Figure 3.7 tensile specimens 

1.4 Hardness test 
 

 
Hard steel or carbide spheres of specified 

diameter are used to indent a material's 

surface, and the diameter of the indentation 

left after the test is used to measure Brinell 

hardness. An indentation with a surface area of 

square millimetres is referred to as having a 

Brinell hardness number, or simply a Brinell 

number. Even if a pressure reading is obtained 

as a by-product, its units are seldom specified. 

The BHN is determined using the following 

formula: 

 
 
 
 
 

 

Where 
 

 
Number of Brinell hardness in Brinell hardnessF 

= the imposed load in kg 

D = the spherical indenter's diameter in 

millimetres 

Di is the resultant indenter impression's 

diameter, measured in millimetres 

 

 



CTMJ | traditionalmedicinejournals.com Chinese Traditional Medicine Journal | 2023 | Vol 6 | Issue 3  

and Glass fibres rises, it is apparent that 

ductility is diminishing. AA7075 alloy had the 

 
 
 
 
 
 
 
 
 

 
Conclusion 

1. A composite metal matrix of aluminium 7075 

and titanium It was possible to effectively 

synthesis E-glass and cenoshere composites 

with varied weight fractions using the stir 

casting process. 

When compared to an unreinforced alloy, the 

Al7075-GF-cenoshere composite has a twofold 

increase in hardness due to the addition of glass 

fibres. 

When secondary aluminium particles are added 

to the alloy, the composites' ductility decreases. 

When compared to the hybrid composites, 

however, Al7075 alloy has a greater ductility. 

4. The ultimate tensile strength of Al7075 alloy 

and Al7075-GF-Cenoshere composites rises 

when the proportion of dual reinforcement is 

increased. 

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