Mechanical and microstructural analysis of Al-Al2O3/B4C hybrid composites

The present work aims to enhance the mechanical performance of monolithic Al alloy and single reinforced metal matrix composite using a hybridization technique. The microparticles of alumina and boron carbide were reinforced into cast Al alloy (6061) in a systematic varying ratio (i.e.100/0, 75/25, 50/50, 25/75 and 0/100) to prepare the hybrid metal matrix composites via stir casting method. The mechanical properties (i.e. tensile, impact, hardness and flexural) of the prepared composites were investigated as per ASTM standards. Furthermore, microstructural analysis of unfractured and fractured composite samples was also carried out using Scanning Electron Microscope. It was observed that hybrid composites comprising of microparticles revealed an enhanced tensile, flexural and hardness properties, and reduced impact energy and porosity as compared to Al alloy and single reinforced metal matrix composites. The highest values of tensile strength and modulus were offered by a hybrid composite (B50A50), which was 40% and 52.12% higher than that of Al alloy. Furthermore, there was an improvement of 105.72% in flexural strength and a reduction of 23.88% in impact energy for composite B50A50 than that of Al alloy. The present developed hybrid metal matrix composites can be proposed to be used in automobile parts and construction applications.

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Effect of Reinforcements on Mechanical Properties of Nickel Alloy Hybrid Metal Matrix Composites Processed by Sand Mold Technique

Applied Science and Engineering Progress ◽

10.14416/j.asep.2020.11.001 ◽

2020 ◽

Vol 14 (1) ◽

Author(s):

Kumaraswamy Jayappa ◽

Vijaya Kumar ◽

Gange Gowda Purushotham

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Metal Matrix Composites ◽

Metal Matrix ◽

Hybrid Composites ◽

Research Work ◽

Weight Percent ◽

Matrix Composites ◽

Hybrid Metal Matrix Composites ◽

Ni Alloy

Hybrid Metal Matrix Composites (HMMCs) have gained wide applications in aerospace, marine, and domestic areas because of its significant properties relative to external forces and enabling environment. In present research work, Ni-alloy selected as a matrix and Al2O3 of 40–80 μm and TiO2 of 1–5 μm were selected as reinforcements. The composites were prepared by keeping 9 wt. % of TiO2 as unvarying and Al2O3 is varied from 3 weight % to 12 weight % in steps of 3 weight %. Induction furnace is used for the casting of composites and mixing is done by using mechanical stirring at 160 rpm for a time period of 5 min. The prepared composites are then tested for their tensile and hardness as per the ASTM standards. The Scanning Electron Microscopy was used for microstructural study. From experimentation, it was observed that increment in the weight percentage of Al2O3 with constant TiO2 increases the mechanical properties of hybrid composites and proper stirring improves homogeneity in the composite material. The test results show that the addition of Al2O3 up to 9 weight percent increases in tensile strength compared to Ni alloy and tensile strength slowly decreases with the addition of Al2O3 and that the hardness values are directly proportional to the weight percent of the addition of Al2O3 / TiO2.

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Fabrication and tribological study of AA6061 hybrid metal matrix composites reinforced with SiC/B4C nanoparticles

Industrial Lubrication and Tribology ◽

10.1108/ilt-05-2018-0166 ◽

2019 ◽

Vol 71 (1) ◽

pp. 83-93 ◽

Cited By ~ 7

Author(s):

Shubhajit Das ◽

Chandrasekaran M. ◽

Sutanu Samanta ◽

Palanikumar Kayaroganam ◽

Paulo Davim J.

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Hybrid Composites ◽

Normal Load ◽

Matrix Composites ◽

Sliding Speed ◽

Ceramic Particles ◽

Content Type ◽

Ceramic Nanoparticles ◽

Hybrid Metal Matrix Composites

Purpose Composite materials are replacing the traditional materials because of their remarkable properties and the addition of nanoparticles making a new trend in material world. The nano addition effect on tribological properties is essential to be used in automotive and industrial applications. The current work investigates the sliding wear behavior of an aluminum alloy (AA) 6061-based hybrid metal matrix composites (HMMCs) reinforced with SiC and B4C ceramic nanoparticles. Design/methodology/approach The hybrid composites are fabricated using stir casting process. Two different compositions were fabricated by varying the weight percentage of the ceramic reinforcements. An attempt has been made to study the wear and friction behavior of the composites using pin-on-disc tribometer to consider the effects of sliding speed, sliding distance and the normal load applied. Findings The tribological tests are carried out and the performances were compared. Increase in sliding speed to 500 rpm resulted in the rise of temperature of the contacting tribo-surface which intensified the wear rate at 30N load for the HMMC. The presence of the ceramic particles further reduced the contact region of the mating surface thus reducing the coefficient of friction at higher sliding speeds. Oxidation, adhesion, and abrasion were identified to be the main wear mechanisms which were further confirmed using energy dispersive spectroscopy and field emission scanning electron microscopy (FESEM) of the worn out samples. Practical implications The enhancement of wear properties is achieved because of the addition of the SiC and B4C ceramic nanoparticles, in which these composites can be applied to automobile, aerospace and industrial products where the mating parts with less weight is required. Originality/value The influence of nanoparticles on the tribological performance is studied in detail comprising of two different ceramic particles which is almost new research. The sliding effect of hybrid composites with nano materials paves the way for using these materials in engineering and domestic applications.

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Effect of Gr Contents on Wear Properties of Al2024/MgO/Al2O3/Gr Hybrid Composites

MATEC Web of Conferences ◽

10.1051/matecconf/201816702010 ◽

2018 ◽

Vol 167 ◽

pp. 02010 ◽

Cited By ~ 1

Author(s):

İsmail Ovalı ◽

Cemal Esen ◽

Sevda Albayrak ◽

Halil Karakoç

Keyword(s):

Wear Resistance ◽

Metal Matrix Composites ◽

Metal Matrix ◽

Hybrid Composites ◽

Three Dimensional ◽

Matrix Composites ◽

Wear Properties ◽

Wear Process ◽

Hybrid Metal Matrix Composites ◽

Aa 2024

In the present study, hybrid metal matrix composites, Al2024/10Al2O3, Al2024/10Al2O3/3MgO, Al2024/10Al2O3/6MgO, Al2024/10Al2O3/3MgO/1.5 Gr, Al2024/10Al2O3/3MgO/3Gr, and reinforcement samples (AA 2024) produced with powder metallurgy process. AA 2024 and reinforcement powders were determined mixture rations and separately mixed during 30 minutes in a three-dimensional Turbula mixer. The mixed compositions were pressed at 300 MPa and sintered at 550°C during 1 h. After that, three materials were extruded at the same temperature. Experimental results show that hybrid metal matrix composites (HMMCs) a better wear resistance than the reinforcement samples because of higher hardness. Gr behave as a lubricant during wear process. The wear resistance of HMMCs can be optimized with controlling of the reinforcement content and type.

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The Effect of Random Spectrum on the Fatigue Life of Hybrid Metal Matrix Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.118-120.336 ◽

2010 ◽

Vol 118-120 ◽

pp. 336-341

Author(s):

Yi Qi Wang ◽

Hyoun Kon Ku ◽

Gi Beop Nam ◽

Jung I. Song

Keyword(s):

Fatigue Life ◽

Metal Matrix Composites ◽

Metal Matrix ◽

Fatigue Crack Initiation ◽

Summation Method ◽

Al Alloy ◽

Matrix Composites ◽

Periodic Load ◽

Hybrid Metal Matrix Composites ◽

Base Matrix

This research makes comparisons of empirical fatigue-lives between AC8A Al alloy and the metal matrix composites (Al/Al2O3, Al/Al2O3/Al2O3p), and also includes comparisons of fatigue-lives between empirical fatigue-lives and estimated fatigue-lives from regular-periodic load testing, acoustic emission (AE) method to predict fatigue-crack initiation before visible in sight and SEM (Scanning Electron Microscope) photographs of each material. According to the test results of the notched specimen, the fatigue life of the hybrid metal matrix composites and the metal matrix composites, which are more brittle than the base matrix was shorter than that of the base matrix under both types of loads. In addition, the fatigue-life estimated from the damage summation method and that from experiments at random loads were fairly identical.

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