Investigations on Mechanical Behaviour of B4C and MoS2 Reinforced AA2024 Hybrid Composites

2015 ◽  
Vol 15 (4) ◽  
pp. 339-343 ◽  
Author(s):  
Bhargavi Rebba ◽  
N. Ramanaiah
Keyword(s):  
Mechanical Properties ◽  
Hybrid Composite ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Base Alloy ◽  
Casting Process ◽  
Stir Casting ◽  
Mechanical Tests ◽  
Molybdenum Disulphide ◽  
Matrix Metal

AbstractThe results of an experimental investigation of the mechanical properties of boron carbide (B4C) and molybdenum disulphide (MoS2) reinforced aluminium alloy (AA2024) hybrid composite samples, processed by stir casting process are reported in this paper. Based on the previous studies, it was concluded that for 4% of weight of the B4C powders reinforced in AA2024 metal matrix have better mechanical properties like tensile strength and hardness than the base alloy. Also the 4% of MoS2 reinforced in AA2024 metal matrix exhibited good mechanical properties than the matrix metal. Hence an attempt has been made to further improve the properties of the composite using both B4C and MoS2 as reinforcement particles in the AA2024 matrix. in the present study hybrid composite specimen were developed varying the weight% of B4C and MoS2, viz., 1%+3%, 2%+2%, 3%+1% B4C and MoS2 respectively in the AA2024 matrix. The prepared samples were subjected to a series of mechanical tests like tensile and hardness tests. Further, SEM & XRD analyses were performed on the prepared samples to study the microstructure and to ensure the proper dispersion of the reinforced particles in the metal matrix.

scholarly journals Microstructure and Mechanical Properties of Al-Mg-Si Hybrid Composites Reinforced with SiC/TiO2

2021 ◽  
Vol 58 (1) ◽  
pp. 3076-3088
Author(s):  
Dr. Israa A. Al. Kadir Hanan K. Azeez
Keyword(s):  
Mechanical Properties ◽  
Hybrid Composites ◽  
Base Alloy ◽  
Casting Process ◽  
Stir Casting ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
X Ray ◽  
Particulate Reinforcement ◽  
The Matrix

The aims of thiswork is to investigate the effect of adding different weight percents of TiO2 and SiC 1.5:0,3:0, 4.5:0, 0:1.5, 0:3, 0:4.5, 1.5:1.5, 3:3, 4.5:4.5 particulate reinforcement on the mechanical properties andmicrostructure properties of base alloy Al-Mg-Si.By stir casting process, base alloy and hybrid composites were developed.  By using stiffness and tensile measures, the mechanistic properties of the basic alloy and hybrid composites were calculated.The topography of fracture surfaces was inspected using the scanning electron microscope (ESM) and energy dispersive spectroscopy ( EDS).The findings shows, with a weight rise of 4.5% by the TIO2 / SIC up to 4.5%, Improved absolute tensile power, strength of output and hardness. In contrast, the elongationrate is decreased, The optical microscope inspection shows that the particles in the matrix without any valves are distributed evenly. The X-Ray diffraction manifested the presence of different phases and intermetallic compounds Mg5Si6, Mg2Si, Al2O3, Mg6Si3.3., Al3Mg2 and Al3Ti.

scholarly journals Properties of AlSi9Cu3 metal matrix micro and nano composites produced via stir casting

2018 ◽  
Vol 16 (1) ◽  
pp. 726-731 ◽  
Author(s):  
Tennur Gülşen Ünal ◽  
Ege Anıl Diler
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix ◽  
Weight Fraction ◽  
Stir Casting ◽  
Mechanical Tests ◽  
Matrix Composites ◽  
Casting Method ◽  
Porosity Formation ◽  
Three Point Bending ◽  
Hardness Values

AbstractThe effects of micro and nano sized reinforcement particles on microstructure and mechanical properties of aluminium alloy-based metal matrix composites were investigated in this study. AlSi9Cu3 alloy was reinforced with micro and nano sized ceramic reinforcement particles at different weight fractions by using a stir casting method. The mechanical tests (hardness, three point bending) were performed to determine the mechanical properties of AlSi9Cu3 alloy-based microcomposites (AMMCs) and nanocomposites (AMMNCs). The experimental results have shown that the size and weight fraction of reinforcement particles have a strong influence on the microstructure and the mechanical properties of AlSi9Cu3 alloy-based microcomposites and nanocomposites. The relative densities of all AMMC and AMMNC samples are lower than unreinforced AlSi9Cu3 alloy due to porosity formation with the increase of weight fraction of reinforcement particles. As weight fraction increases, hardness values of AMMCs and AMMNCs increase. Maximum flexural strength can be obtained at 3.5wt.% for the AMMC sample with microsized Al2O3 particles and at 2wt.% for the AMMNC sample with nano-sized Al2O3 particles. After the weight fractions exceed these values, flexural strengths of both AMMCs and AMMNCs decrease due to clustering of Al2O3 particles.

scholarly journals Evaluation of Mechanical Properties of AA7075 /Al2O3/Mg Hybrid Composites

2019 ◽  
Vol 8 (6) ◽  
pp. 5044-5046 ◽  
Keyword(s):  
Mechanical Properties ◽  
Hybrid Composites ◽  
Casting Process ◽  
Stir Casting ◽  
Tensile Behaviour ◽  
Matrix Composites ◽  
Compression Behavior ◽  
Weight Percentage ◽  
Fea Simulation ◽  
Alloy Metal

The present work was planned to evaluate the mechanical properties of alumina reinforced aluminium alloy such hardness and compression behavior of al2o3 /aa7075 alloy metal matrix composites. Both, experimental and finite element analyses were carried out to establish tensile behaviour of the composites with different weight percentage of al2o3 fabricated by the stir casting process. The results concluded that addition of alumina to the aa7075 improves the mechanical properties of the composite. Further the results of FEA simulation of the composites are close to the actual results which shows that cost and time can be reduced if FEA is performed

Investigation of flexural and impact strength of carbon nanotube reinforced AA7075 metal matrix

2018 ◽  
Vol 7 (2) ◽  
pp. 764
Author(s):  
Pothamsetty Kasi V Rao ◽  
B Raghu Kumar ◽  
B Sudheer Kumar ◽  
G Phanindra Swamy ◽  
Y Ganga Raju ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Impact Strength ◽  
Flexural Strength ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Casting Process ◽  
Stir Casting ◽  
Pure Metal ◽  
Mechanical Tests

Metal matrix nano-composites are grabbing more attention by many researchers in the recent years as they exhibit outstanding properties when compared to pure metal alloys. In the present study Aluminium Alloy 7075 was selected as the matrix and carbon nanotubes was selected as reinforcing element to investigate the percentage enhancement of flexural strength and impact strength of metal matrix composite. Stir casting process was selected to fabricate the specimens. The multi walled carbon nanotubes with different weight percentages (0.5, 1.0, 2.0, 5.0 wt %) were selected to prepare the AA7075-CNT metal matrix composite.  Microstructure and dispersion of CNT was examined using Scanning Electron Microscope (SEM) with EDX. The experimental results of mechanical tests showed that if the MWCNTs particle content increases considerably flexural strength and impact strength also increases about 125% and 90% respectively. Thus the AA7075-CNT metal matrix can be used in automobile and aerospace applications under high load conditions.

Metallography & Bulk Hardness of Artificially Aged Al6061-B4C-SiC Stir Cast Hybrid Composites

2016 ◽  
Vol 880 ◽  
pp. 140-143
Author(s):  
Sathya Shankar Sharma ◽  
K. Jagannath ◽  
P.R. Prabhu ◽  
Shankar M.C. Gowri ◽  
S.R. Harisha ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Hybrid Composites ◽  
Intermetallic Phase ◽  
Aging Treatment ◽  
Casting Process ◽  
Stir Casting ◽  
Nucleation Site ◽  
Age Hardening ◽  
Bulk Hardness ◽  
Al6061 Alloy

Present investigation focusses on combined effect of B4C and SiC on the improvement in hardness with an average size of 35-40μm on Al6061 hybrid composite. Composites are produced by stir casting process. The effect of artificial aging treatment with different aging temperatures of 100, 150 and 200OC on the improvement in hardness is also investigated. Optical micrographs and Brinell hardness number have been discussed. An attempt is made to find out the intermetallic phase responsible for strengthening by Transmission Electron Microscopy. Due to positive response to age hardening treatment there is an improvement in the mechanical properties of Al6061 alloy & its hybrid composite. The aging kinetics is more accelerated in case of hybrid composites as compared to unreinforced Al6061 alloy because of presence of reinforcement particulate, which act as nucleation site for precipitation. Artificially aged at 100OC shows improvement in hardness by 120-220% due to the precipitation of secondary solute rich phase of alloying elements as compared Al6061 alloy.

scholarly journals Impact on Mechanical Properties of Hybrid Aluminum Metal Matrix Composites

2019 ◽  
Vol 8 (6) ◽  
pp. 1638-1645 ◽  
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Base Alloy ◽  
Mechanical Tests ◽  
Matrix Composites ◽  
Cast Aluminum ◽  
Alloy Matrix ◽  
Aluminum Metal ◽  
Aluminum Metal Matrix Composites

Hybrid composites are those composites which have a combination of two or more reinforcements in a single matrix. In this study, Hybrid Aluminum Metal Matrix Composites were fabricated by using Stir Casting technique. Hybrid composites with three reinforcements such as Aluminum oxide(Al2O3 ), Silicon Carbide (SiC) and Boron Carbide (B4C) in different proportions are considered and Aluminum alloy 6061-T6 (Al6061) as base alloy matrix. Later, the cast aluminum metal matrix composites were machined as per ASTM standards with required dimensions. Mechanical tests such as tensile, flexural, Charpy impact, Brinell Hardness tests were conducted on the composites fabricated inorder to evaluate effect of reinforcements. Morphological study of the composites is carried out by using Scanning electron microscope (SEM). The test results were studied and analyzed.

scholarly journals Investigation on Mechanical and Wear Behaviors of LM6 Aluminium Alloy-Based Hybrid Metal Matrix Composites Using Stir Casting Process

2022 ◽  
Vol 2022 ◽  
pp. 1-10
Author(s):  
P. Gnaneswaran ◽  
V. Hariharan ◽  
Samson Jerold Samuel Chelladurai ◽  
G. Rajeshkumar ◽  
S. Gnanasekaran ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Steel Fiber ◽  
Hybrid Composites ◽  
Casting Process ◽  
Stir Casting ◽  
Image Analyzer ◽  
Matrix Composites ◽  
Silicon Based ◽  
Boron Carbide B4c

In this investigation, aluminium-silicon-based alloy (LM6) with the addition of (0, 2.5, 5, and 10%) copper-coated short steel fiber and 5% boron carbide (B4C) element-strengthened composites was fabricated by the stir casting method. Mechanical properties and tribological behaviors of LM6-based hybrid composites were investigated, and microstructures of different castings were examined by an image analyzer. The test was conducted at different loads (10, 20, 30, and 40 N) and different sliding spaces (500, 1000, 1500, and 2000 m), respectively. The results revealed that the sample loaded with 10% of reinforcement recorded the highest tensile strength of 231 MPa. On the other hand, the hardness value increased from 71 to 144 BHN, when 15% of reinforcement was added to the sample. It was also noted that 10% copper-coated steel fiber improved wear resistance up to 50% when compared to LM6. A field emission scanning electron microscope was employed to observe the morphology of the worn surfaces of composites at different sliding distances and load conditions. The hybrid composite revealed that the combination of both short steel fibers and reinforcement of ceramic particles enhanced the mechanical properties, obtaining superior wear resistance.

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