Degradation of Hybrid Metal Matrix Composites Reinforced with Boron Carbide and Graphite Particles due to Pit Corrosion

2015 ◽  
Vol 813-814 ◽  
pp. 19-24 ◽  
Author(s):  
V.M. Ravindranath ◽  
G.S. Shiva Shankar ◽  
Anup Hanji ◽  
N.G. Siddeshkumar
Keyword(s):  
Boron Carbide ◽  
Metal Matrix ◽  
Sea Water ◽  
Hybrid Composites ◽  
Corrosion Behaviour ◽  
Base Alloy ◽  
Standard Procedure ◽  
Test Material ◽  
Time Interval ◽  
Cyclic Polarization

In the present study, the corrosion behaviour of the Al2219, Boron carbide and Graphite has been investigated. The Aluminium Metal Matrix Hybrid Composites were fabricated by two step stir casting technique. Corrosion tests were carried out with the natural sea water (3.5 wt % NaCl) according to standard procedure. The tests were conducted at room temperature by cyclic polarization technique for a definite time interval. After the test, material loss was calculated by weight loss method. The surface morphology of the specimen before and after corrosion was studied using the optical microscope images. The test result reviles that, the corrosion rate of the composite was greater than the base alloy, but the corrosion of the hybrid composite is the most compared to the alloy and monolithic composite.

Mechanical characterization of eggshell ash and boron carbide reinforced ZA-27 hybrid metal matrix composites

2021 ◽  
pp. 095440622110200
Author(s):  
Pawandeep Singh ◽  
RK Mishra ◽  
Balbir Singh
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Impact Strength ◽  
Boron Carbide ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Base Alloy ◽  
The Matrix ◽  
The Impact

This study aimed at discovering the influence of low-cost eggshell ash (ESA) and boron carbide (B4C) addition on microstructure and mechanical characteristics of ZA-27 hybrid composites. Six different composites were fabricated utilizing the stir casting technique with different weight percentages of ESA and B4C particles varied from 0-5 wt.%. Composites were tested for density, hardness, compressive strength, tensile strength, and impact strength. X-ray diffraction (XRD) and scanning electron microscope (SEM) were utilized for the characterization of composites. Microstructure examination using SEM exhibited homogeneously dispersed reinforcements in the matrix. ESA particles decreased the composite density by 3.12%, and after the addition of B4C particles, density was found to be increased but was still lower than the base ZA-27 alloy. The hardness, tensile and compressive strength of the composites increased with the addition of reinforcements. However, composite reinforced with maximum wt.% of B4C particles showed a decreasing trend. The impact strength of the composites decreased when compared with the base alloy, but the reduction was marginal. Improved hardness, tensile and compressive strength of the composites was attributed to homogeneously dispersed ESA and B4C particles in the matrix. Higher tensile strength resulted from strong interfacial bonding between reinforcements and metal matrix, and low impact strength was due to brittle failure and plastic deformation.

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 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.

Microstructural and mechanical characterization of lamb bone ash and boron carbide reinforced ZA-27 hybrid metal matrix composites

2021 ◽  
pp. 146442072110075
Author(s):  
Pawandeep Singh ◽  
RK Mishra ◽  
Balbir Singh
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Metal Matrix ◽  
Mechanical Characterization ◽  
Hybrid Composites ◽  
Base Alloy ◽  
Matrix Composites ◽  
X Ray ◽  
Reinforced Composite ◽  
Bone Ash

ZA-27 hybrid metal matrix composites reinforced with lamb bone ash (LBA) and boron carbide (B4C) were fabricated by employing stir casting route. Single-reinforced composite with 5 wt.% of LBA and hybrid composites reinforced with LBA/B4C in the ratio of (3.75:1.25, 2.5:2.5, 1.25:3.75) were developed. Composites were processed as per ASTM standards and subjected to physical characterization (density and porosity), microstructural characterization, and mechanical characterization (hardness, compressive strength, tensile strength, and impact strength). Microstructural studies of ZA-27 composites using a scanning electron microscope (SEM) revealed the uniform dispersion of reinforcements. X-ray diffraction (XRD) patterns and energy-dispersive X-ray spectroscopy (EDS) of the developed composites confirmed the existence of LBA and B4C particles in the matrix. The density of the composites declined, and porosity increased with the increment in B4C wt.% compared with base alloy. Mechanical properties like hardness, compressive strength, and tensile strength improved significantly in the case of hybrid composites than single-reinforced composite. Hardness, compressive strength and tensile strength of the hybrid composites increased to a maximum of 41.12%, 24.40%, 61.08% respectively compared to the base alloy, whereas single-reinforced composite showed maximum improvement of 19.26% (hardness), 11.16% (compressive strength), and 28.38% (tensile strength) compared to the base alloy. Ductility of the composites decreased with the addition of reinforcements. Impact strength of the composites showed a marginal reduction; however, the reduction was higher in the single-reinforced composite than hybrid reinforced composites. Fractured morphology showed dimples, cracks, tear ridges, and voids.

Effect of High Temperature on Wear Behavior of Stir Cast Aluminium/Boron Carbide Composites

2020 ◽  
Vol 22 (4) ◽  
pp. 1031-1046
Author(s):  
X. Canute ◽  
M. C. Majumder
Keyword(s):  
High Temperature ◽  
Wear Rate ◽  
Boron Carbide ◽  
Wear Behavior ◽  
Base Alloy ◽  
Weight Fraction ◽  
Sliding Velocity ◽  
Wear Properties ◽  
High Temperature Wear ◽  
The Matrix

AbstractThe need for development of high temperature wear resistant composite materials with superior mechanical properties and tribological properties is increasing significantly. The high temperature wear properties of aluminium boron carbide composites was evaluated in this investigation. The effect of load, sliding velocity, temperature and reinforcement percentage on wear rate was determined by the pin heating method using pin heating arrangement. The size and structure of base alloy particles change considerably with an increase of boron carbide particles. The wettability and interface bonding between the matrix and reinforcement enhanced by the addition of potassium flurotitanate. ANOVA technique was used to study the effect of input parameters on wear rate. The investigation reveals that the load had higher significance than sliding velocity, temperature and weight fraction. The pin surface was studied with a high-resolution scanning electron microscope. Regression analysis revealed an extensive association between control parameters and response. The developed composites can be used in the production of automobile parts requiring high wear, frictional and thermal resistance.

Studies on mechanical property and wear behaviour of AA7075 hybrid composites prepared by a conventional casting method

2021 ◽  
pp. 095440892110349
Author(s):  
V Vignesh Kumar ◽  
K Raja ◽  
T Ramkumar ◽  
M Selvakumar ◽  
TS Senthil Kumar
Keyword(s):  
Boron Nitride ◽  
Boron Carbide ◽  
Hybrid Composites ◽  
Stir Casting ◽  
Wear Behaviour ◽  
Tensile Behaviour ◽  
Wear Properties ◽  
Casting Technique ◽  
Reciprocating Wear ◽  
Sliding Distance

The research article addresses the reciprocating wear behaviour of hybrid AA7075 reinforced with boron carbide and boron nitride through a stir-casting technique. The experiment involved varying wt.% of the secondary particle boron carbide (3, 6 and 9) while boron nitride (3) was kept as constant. The hybrid composites were characterised using scanning electron microscopy coupled with energy dispersive spectroscopy. The hardness and tensile behaviour of the hybrid composites were evaluated. Reciprocating wear behaviour of the hybrid composites were examined using a tribometer by varying the wear parameters such as load and sliding distance. The results revealed that AA7075/6boron carbide/3boron nitride had better hardness, tensile and wear properties. The surface morphology of the wear samples was analysed using SEM.

Analysis of mechanical behavior of Al 6061 metal matrix with boron carbide and graphite

2021 ◽  
Author(s):  
SM. Sutharsan ◽  
P. Senthilkumar ◽  
B. Koodalingam ◽  
U. Nattarselvi ◽  
K. Murali Kumar ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Mechanical Behavior ◽  
Metal Matrix ◽  
Al 6061
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