scholarly journals Role B4C Addition on Microstructure, Mechanical, and Wear Characteristics of Al-20%Mg2Si Hybrid Metal Matrix Composite

2021 ◽  
Vol 11 (7) ◽  
pp. 3047
Author(s):  
Hamidreza Ghandvar ◽  
Mostafa Abbas Jabbar ◽  
Seyed Saeid Rahimian Koloor ◽  
Michal Petrů ◽  
Abdollah Bahador ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Hybrid Composite ◽  
Cooling Curve ◽  
Dry Sliding Wear ◽  
Solidification Behavior ◽  
Mechanical And Tribological Properties ◽  
Primary Mg2si ◽  
B4c Particles ◽  
Mean Size ◽  
Hybrid Metal Matrix Composite

In the current study, the effect of different B4C additions (0, 2.5, 5, and 10 wt%) on the microstructural, solidification behavior, mechanical, and tribological properties of Al-20%Mg2Si composite were studied by means of scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Vickers hardness, tensile, and dry sliding wear tests. The cooling curve thermal analysis (CCTA) approach was utilized to monitor the influence of B4C particles on the solidification behavior of Al-20%Mg2Si composite. The results revealed that the addition of B4C particles up to 10 wt% reduced the nucleation temperature (TN) and growth temperature (TG) of the primary Mg2Si phase. Moreover, the proper amount of B4C added to Al-20%Mg2Si composite has a significant effect on the microstructural alteration, mechanical, and tribological properties of the composite. The mean size of primary Mg2Si in Al-Mg2Si composite was 47 μm, in which with the addition of 5 wt% B4C, the particle size decreased to 33 μm. The highest UTS (217 MPa) and El% (7%) was achieved in Al-20%Mg2Si-5%B4C hybrid composite. The cast Al-20%Mg2Si composite revealed the brittle mode of fracture with some cleavage characterization, in which with the addition of 5%B4C, the fracture mode altered to a more ductile fracture. The wear results revealed that the Al-20%Mg2Si-5%B4C hybrid composite has the highest wear resistance with the lowest wear rate (0.46 mm3/Km) and friction coefficient (µ = 0.52) under 20 N applied load compared to other fabricated composites with mild abrasion as the governed wear mechanism.

scholarly journals Microstructural characterization, mechanical and tribological properties of ZC71 hybrid composite reinforced with SiC and MWCNT

2021 ◽  
Vol 19 (4) ◽  
pp. 345-363
Author(s):  
Afshin Nafari ◽  
Hamidreza Ghandvar ◽  
Kh. a. Nekouee
Keyword(s):  
Wear Resistance ◽  
Tribological Properties ◽  
Hybrid Composite ◽  
Microstructural Characterization ◽  
Considerable Effect ◽  
Particle Sizes ◽  
Mechanical And Tribological Properties ◽  
Worn Surface ◽  
Hardness Values ◽  
Sic Particle

In the present study, the influences of different SiC addition, MWCNTs and various SiC particle sizes on the structural, mechanical and tribological properties of ZC71 alloys were studied. The results revealed that the proper amount/size of SiC particles with the addition of MWCNTs had a considerable effect on the microstructural alteration, and mechanical and tribological properties of the ZC71 alloy. The Vickers hardness values of the ZC71 alloy improved with the addition of MWCNT and SiC. The UTS (216 MPa) and El.% (6.95 %) were achieved in the ZC71-5%SiC(15µm)-0.5%MWCNT. The cast ZC71 alloy showed brittle fracture with some quasi-cleavage characterizations. However, by adding 5% SiC(15 µm) and 0.5% MWCNT, the fracture mode changed to ductile fracture. The wear results showed that the ZC71-5%SiC-0.5%MWCNT hybrid composite had the highest wear resistance with the lowest friction coefficient and wear rate. Examination on the worn surface of the ZC71-5%SiC-0.5%MWCNT hybrid composite showed mild abrasion as the governing wear mechanism.%2

scholarly journals Mechanical and Dry Sliding Wear Behaviour of Al6061/Gr MMCs and its Multi Response Optimization using Hybrid Fuzzy Grey Relational Technique

2019 ◽  
Vol 9 (2) ◽  
pp. 1174-1183
Keyword(s):  
Heat Treatment ◽  
Tribological Properties ◽  
Sliding Wear ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Wear Loss ◽  
Dry Sliding ◽  
T6 Heat Treatment ◽  
Mechanical And Tribological Properties ◽  
Grey Relational

An attempt is made to find the mechanical and tribological properties of Al6061/Gr metal matrix composites (MMC) produced using stir casting method. It is important to note that the certain components require high hardness and wear resistance to fulfil the functional requirements, the said properties of the MMCs influenced largely on the condition with which they are produced or treated. Therefore, in the present paper the composites are tested in two stages that is before T6 heat treatment and after T6 heat treatment respectively. The composites are made with Al6061 alloy as matrix and graphite with 3%, 6%, 9% and 12% by wt is considered as reinforcement. Once the composites are prepared, they are examined for their microstructural, mechanical, and tribological properties. Further, a response surface methodology (RSM) has been used to model the wear loss and coefficient of friction for both before and after T6 heat treatment of MMCs. The non-linear regression model obtained is validated both statistically and with the help of experimental test cases. The evidence of wear phenomenon has been observed with the help of Scanning Electron Microscopy (SEM). Further, fuzzy grey relational Technique has been used to determine the multi performance index for the dry sliding wear and friction phenomenon of the developed composite.

scholarly journals Influence Of Flyash & Silicon Nitride On Mechanical & Tribological Properties Of Aa 7075 Hybrid Composite

2019 ◽  
Vol 8 (9) ◽  
pp. 2344-2350
Keyword(s):  
Silicon Nitride ◽  
Wear Rate ◽  
Tribological Properties ◽  
Hybrid Composite ◽  
Base Alloy ◽  
Research Work ◽  
Dry Sliding Wear ◽  
Percentage Increase ◽  
X Ray ◽  
Aa 7075

The main objective of this research work is to study the effect of Silicon Nitride (Si3N4 ) and Flyash on the mechanical and tribological properties of AA 7075 hybrid composite. The Stir casting technique has been used for the fabrication of composite material. sAA 7075 were reinforced with 2 wt. % of Silicon Nitride and 2.5, 5, 7.5 wt. % of Flyash. Pin-on-disc equipment is used to evaluate the wear rate of the base alloy and hybrid composite. Dry sliding wear test were performed with the contact load which is varied by 10, 20 & 30 N. Sliding velocity is varied by 1, 1.5 and 2 m/s. Sliding distance is kept constant at 1000 m. The Scanning Electron Microscope (SEM), Energy Dispersive X Ray Spectroscopy (EDAX) and X-ray diffraction (XRD) were used for the characterization of the composites. The maximum hardness of 173 HV is achieved for 5 wt% Flyash and 2 wt% of Silicon Nitride addition. The percentage increase in hardness is 155 % above the base metal. AA 7075 with the 5 wt % reinforcement of Flyash shows the minimum wear rate. With respect to the base the wear rate is reduced by 59 %.

Mechanical and Tribological Properties of Al6063 Hybrid Composites Reinforced with SiC/ZrO2 by Stir Casting and Thixoforming Process

2020 ◽  
Vol 979 ◽  
pp. 47-51
Author(s):  
K. Sekar ◽  
P. Vasanthakumar
Keyword(s):  
Tribological Properties ◽  
Hybrid Composite ◽  
Hybrid Composites ◽  
Matrix Material ◽  
Stir Casting ◽  
Wear Volume ◽  
Wear Loss ◽  
Mechanical And Tribological Properties ◽  
Micro Particles ◽  
Deep Groove

Hybrid metal matrix composites new generation of engineering materials with better mechanical and tribological properties. Al6063 alloy has the matrix material and reinforcement SiC and ZrO2 micro particles are selected for the study. In this work, Al6063/ SiC/ZrO2 hybrid composite fabricated with different wt. % of reinforcements (0.5, 1, and 1.5 wt. % SiC and 1 wt. % ZrO2 constant for all composites) by using stir casting process. The thixoforming process applied to casted composite. The SiC and ZrO2 particle was distributed in the Al-matrix are visible in the SEM micrographs .The hardness value of the composite 34.75% increased due to the addition of constant 1 wt. % of ZrO2 and varying SiC reinforcement particles. The charpy impact strength of Al composite was increased by 23.52 % with the addition of the constant 1 % wt. ZrO2 and 1 wt. % SiC particles. Wear behavior of Al6063/SiC/ZrO2 hybrid composite was tested using pin-on-disc machine. The wear volume loss decreased for 1.5 % wt. SiC and 1 wt. % ZrO2 compared to other composite. The worn surface morphology has revealed that Al6063 base alloy with deep groove. The composite with 0.5%, 1% wt. SiC and constant 1 wt.% ZrO2 showed more debris, dilamation and cleavage particles formed on the pin surface. The composite with 1.5 % wt. SiC and constant 1 wt.% ZrO2 showed less wear loss and smooth surface formation.

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