scholarly journals Influence of Gr, MoS2 and BN on the Hardness and Wear resistance of AA2014 Hybrid Composite after Artificial Aging

2019 ◽  
Vol 8 (10) ◽  
pp. 3608-3613 ◽  
Keyword(s):  
Wear Rate ◽  
Base Metal ◽  
Hybrid Composite ◽  
Base Alloy ◽  
Research Work ◽  
Stir Casting ◽  
X Ray Diffraction ◽  
X Ray ◽  
Casting Technique

The main objective of this research work is to study the effect of tribological behaviors and mechanical properties of Aluminium alloy 2014 (AA2014) hybrid composite reinforced with Boron Nitride (BN), Molybdenum disulfide (MoS2) and graphite (Gr). Stir casting technique is used for the fabrication of this composite material. The composite is subjected to three step ageing process which consists of solution heat treatment, quenching and aging. The base alloy was reinforced with 4 wt.% of BN, 4wt.% MoS2 and 4, 6, 8 wt.% of Gr. The hardness of the composite steadily increased up to 6 wt. % of graphite and further increase in graphite decreases the hardness. The sample with Graphite of 4 wt. % resulted in maximum hardness of 192 HV with respect to AA2014 base hardness. Addition of graphite up to 6% resulted in lower wear rate when compared to the base metal. The wear rate of sample with Graphite of 4 wt. % is reduced by 49 % from that of the base metal at maximum wear condition. Scanning Electron Microscope (SEM), Energy-dispersive X-ray Spectroscopy (EDX) and X-Ray Diffraction (XRD) were used for the characterization of 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 %.

scholarly journals Characterization of secondary deposits of columbite-tantalite minerals found in the city of Rorainópolis (RR), Brazil

2020 ◽  
Vol 8 (4) ◽  
pp. 450-468
Author(s):  
Anna Caroline Andrade Pinto ◽  
Tiago Felipe Arruda Maia
Keyword(s):  
Scientific Community ◽  
Research Work ◽  
Geological Mapping ◽  
Mineral Deposits ◽  
X Ray Diffraction ◽  
X Ray ◽  
Source Areas ◽  
The City ◽  
Petrographic Description

Many of the studies about mineral deposits are bringing great information to the scientific community, providing, for example, general characteristics of these deposits, possible source areas and its used in some cases as prospective tools to help in geological mapping. In this way, this study aimed to characterize the alluvial secondary deposits of columbite-tantalite that were found near vicinal 12, about 50km north/northeast of Rorainópolis city, between the BR-174 and BR-210 roads, in the state of Roraima (Brazil), bases on 4 samples that were brought by a resident of the region. To fulfill these objectives, some chemical and mineralogical methods were performed, like: magnetic separation, X-ray diffraction, X-ray fluorescence and petrographic description. The deposits of the region end up being characterized by having a large amount of Fe and Ti (mostly), containing in some places also a large concentration of Niobium and Tantalum. Not all samples have columbite-tantalite, showing that their concentration in some areas of the deposit is quite low. There are samples with less than 1% Nb and Ta and also samples with more than 20% Nb and 6% Ta concentration. These minerals were poorly transported, being identified by the degree of roundness and granulometry of the samples. A weathering cap on some minerals could also be verified. This research work turned out to be relevant, as it provides new data that add to the knowledge of the mineral potential, which has not been fully explored yet.

Preparation and Characterization of Alpha Cellulose of Pineapple (Ananas comosus) Leaf Fibres (PALF)

2014 ◽  
Vol 895 ◽  
pp. 147-150 ◽  
Author(s):  
Nur Ain Ibrahim ◽  
Noriean Azraaie ◽  
Nurul Aimi Mohd Zainul Abidin ◽  
Nur Amira Mamat Razali ◽  
Fauziah Abdul Aziz ◽  
...  
Keyword(s):  
Low Cost ◽  
Research Work ◽  
Natural Fibre ◽  
Ananas Comosus ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Family ◽  
Main Component

The main component in natural fibre is cellulose (C6H10O5)n. Cellulose from agricultural by-product is abundant, low cost, eco-friendly, biodegradable, and renewable. This research work was prepared alpha cellulose from pineapple leaf fibre (PALF), which obtained from the leaves of pineapple plant, Ananas comosus belonged to the family Bromeliaceae. The treated and untreated samples were characterized using X-ray diffraction (XRD).

Effects of Red Mud Reinforcement on Hardness, Wear Behaviour of Cast Al-6Si-0.45 Mg Alloy

2015 ◽  
Vol 787 ◽  
pp. 658-663 ◽  
Author(s):  
B. Geetha ◽  
K. Ganesan
Keyword(s):  
Mechanical Properties ◽  
Wear Rate ◽  
Red Mud ◽  
Tamil Nadu ◽  
Artificial Aging ◽  
Base Alloy ◽  
Solution Treatment ◽  
Stir Casting ◽  
Wear Behaviour ◽  
Casting Technique

An Investigation was carried out to study the effect of red mud reinforcement in Al-6Si-0.45Mg alloy (A356) for improving hardness, wear rate and co-efficient friction. The red mud 53 micron size particles collected from MALCO, Mettur, Tamil Nadu, India, was preheated in a furnace to 500o C and mixed with molten Al-6Si-0.45Mg alloy to make the composite specimens. Al-6Si-0.45Mg alloy-red mud composite specimens were manufactured by stir casting technique using Al-6Si-0.45Mg alloy as matrix and reinforced with 5%, 10%, 15% and 20% volume percentages red mud as the reinforcement. The Al-6Si-0.45Mg alloy–red mud composite specimens were T6 heat treated to improve the mechanical properties. The artificial aging time and aging duration were varied to study their effect on mechanical properties of the composites. Then the specimens hardness, wear rate and coefficient of friction were tested as per ASTM standards. It was found that the hardness increased when the red mud content was increased in the base alloy at all the heat treatment conditions. The peak age timing which gives highest hardness was found to decrease with increased red mud content. The wear rate was decreased when the hardness was increased. The effect of solution treatment and artificial aging on the microstructure was also studied by microscopy.

The Crystallinity and Hardness Properties of Al-Cu/SiCp New Composite Materials

2012 ◽  
Vol 576 ◽  
pp. 450-453
Author(s):  
A. Arifutzzaman ◽  
Md Abdul Maleque ◽  
D. Sujan
Keyword(s):  
Composite Materials ◽  
Hardness Test ◽  
Stir Casting ◽  
X Ray Diffraction ◽  
X Ray ◽  
Casting Technique ◽  
Hardness Tester ◽  
Transmission Technique ◽  
The Matrix ◽  
Diamond Paste

The main aim of this paper is to investigate the crystallinity and hardness properties of Al-Cu/SiCp matrix composite (AMC) materials. The materials were prepared using a noble stir casting technique by varying the percentage of Cu in the Al-Cu matrix. Qualitative X-ray analysis has been carried out to characterize the crystallinity of the Al-Cu/SiCp as-cast composite materials. Sample was cut and shaped into 25 mm×15 mm×4 mm in dimension then polished with diamond paste. X-ray diffraction diagrams were recorded using a transmission technique with a SHIMADZU Lab X (XRD-6000) X-ray generator operating at Cu Kα1 radiation. Hardness test was conducted using Vickers hardness tester (Mitutuyo, MVK-H2). The results indicated that a significant crystal growth was occurred in the composite materials due to increase of Cu from 2 to 4 % whereas a slight improvement of crystallinity was observed when the Cu percentage was increased from 4 to 6 % in the matrix. It was also revealed from the result that a similar trend was grasped in hardness increment with the crystallinity of Al-Cu/SiCp AMCs.

Mechanical Spectroscopy Study on Cu53.5Zr42Al4.5 Alloy

2011 ◽  
Vol 312-315 ◽  
pp. 1233-1237
Author(s):  
Odila Florêncio ◽  
Paulo Sergio Silva ◽  
Fernando Henrique De Sá ◽  
Paulo Wilmar Barbosa Marques ◽  
Javier Andres Muñoz Chaves ◽  
...  
Keyword(s):  
Internal Friction ◽  
Amorphous Structure ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
Mechanical Spectroscopy ◽  
Temperature Function ◽  
X Ray ◽  
Casting Technique ◽  
Dsc Curves

This study consists of the characterization of the anelastic properties of a Bulk Metallic Glasses (BMG) by mechanical spectroscopy, which can be defined as an energy absorption technique. The equipment used was the acoustic elastometer system, the anelastic relaxation spectra were carried out with a heating rate of 1 K/min and vacuum better than 10-5 torr, in the temperature range of 300 K to 640 K. The amorphous sample studied, with nominal composition of Cu53.5Zr42Al4.5, was processed by skull push-pull casting technique in a rectangular cavity cooper mould. Differential scanning calorimeter (DSC) curves have evidenced the amorphous structure although the X-ray diffraction (XDR) pattern has indicated a heterogeneous microstructure with amorphous matrix and some metaestable nanocrystalline phases which have not been identified yet. The dynamical elastic modulus of this alloy (between 54 GPa and 58 GPa at room temperature) and internal friction patterns as temperature function implied an increase of the crystalline phase during the measurements. This effect was confirmed with new X-ray diffraction measurements after the internal friction experiments.

scholarly journals Electrosynthesis and Characterization of Novel CNx-HMMT Supported Pd Nanocomposite Material for Methanol Electro-Oxidation

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3578
Author(s):  
Faizah Altaf ◽  
Rohama Gill ◽  
Patrizia Bocchetta ◽  
Rida Batool ◽  
Muhammad Usman Hameed ◽  
...  
Keyword(s):  
Direct Methanol Fuel Cells ◽  
Research Work ◽  
Pd Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nitrogen Doped ◽  
Composite Nanomaterial ◽  
Electrochemically Deposited ◽  
Direct Methanol

In the current research work, palladium (Pd) nanoparticles were electrochemically deposited on a nitrogen doped montmorillonite (CNx-MMT) support using the underpotential deposition (UPD) method. The prepared Pd based composite electrode was studied as an electrocatalyst for methanol fuel oxidation. The catalysts and the supporting materials montmorillonite, acid activated montmorillonite, and nitrogen doped montmorillonite (MMT, HMMT and CNx-HMMT) were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) and electrochemical characterization by cyclic voltammetry (CV). The results indicated that Pd supported on CNx-HMMT possesses enhanced electrocatalytic activity and stability compared to commercial Pd/C, which was attributed to its higher electrochemical surface area (ECSA) (23.00 m2 g−1). The results demonstrated the potential application of novel Pd/CNx-HMMT composite nanomaterial as electrocatalysts for methanol electrooxidation in direct methanol fuel cells (DMFCs).

scholarly journals Synthesis and Characterization of In-Situ AA8011-TiB2 Composites Produced by Flux Assisted Synthesis

2020 ◽  
Vol 44 (5) ◽  
pp. 333-338
Author(s):  
Muthamizh Selvan Bellamballi Munivenkatappan ◽  
Sathish Shanmugam ◽  
Anandakrishnan Veeramani
Keyword(s):  
Tensile Strength ◽  
Stir Casting ◽  
Matrix Composites ◽  
Maximum Hardness ◽  
Percentage Elongation ◽  
X Ray ◽  
Casting Technique ◽  
Energy Dispersive Spectroscope

In-situ aluminium alloy 8011 matrix composites containing different weight percentages of titanium diboride were synthesized by flux assisted synthesis using stir casting technique. The metallurgy of the in-situ AA8011-TiB2 composites was analyzed using X-ray diffractometer, scanning electron microscope and energy dispersive spectroscope to disseminate the formation and distribution of reinforcements. Density, microhardness and tensile strength of cast AA8011 and in-situ AA8011-TiB2 composites were measured and analyzed. The in-situ formed TiB2 reinforcements showed the maximum hardness of 55.03 Hv and the maximum tensile strength of 158.2 MPa for 8 wt. % of TiB2 whereas the percentage elongation of 7.2% is observed at 4 wt. % of TiB2. Further, the fractography analysis performed on the fractured tensile samples and the mechanism of failures were identified and reported.

Development and Evaluation of Mechanical Properties of Al/Ilmenite Nanocomposite

2014 ◽  
Vol 704 ◽  
pp. 32-38
Author(s):  
Lanka Rasidhar ◽  
A. Rama Krishna ◽  
Ch. Srinivasa Rao ◽  
K. Vijaya Lakshmi
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Secondary Phase ◽  
Stir Casting ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Matrix ◽  
Scanning Electron

In the present investigation, microstructure and mechanical properties of nanocomposites fabricated via stir casting were evaluated. The composites were based on Al (99.7) reinforced with ilmenite nanoparticles. The characterization of the nanoparticles and nanocomposites was investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) facilities. Microstructure of specimens show that reasonable distribution of FeTiO3 nanoparticles in the matrix, secondary phase FeAl3 observed in the microstructure. Ultimate tensile strength and compression tests were carried out in order to identify the mechanical properties. The hardness of the composites is enhanced with the addition of nanoparticles. The optimum value for ultimate tensile and compression strength are obtained with the addition of 3 % ilmenite nanoparticles. Ductile fracture in tensile fractured samples was observed by fractrography examination.

scholarly journals Effect of Beryl Addition on Mechanical Properties of Al7075 using a Stir Casting Technique

2019 ◽  
Vol 9 (1) ◽  
pp. 3298-3303
Keyword(s):  
Tensile Strength ◽  
Energy Dispersive Spectrum ◽  
Stir Casting ◽  
X Ray Diffraction ◽  
Scanning Electron Microscope Study ◽  
X Ray ◽  
Weight Percentage ◽  
Casting Technique ◽  
Effective Reinforcement ◽  
Scanning Electron

In present study, Al7075-Beryl synthesized by using a stir casting technique. The different weight percentage of Beryl incorporated are 2Wt.% to 8 Wt.% in steps of 2 Wt.%. The effect of Beryl particles integration on hardness and tensile strength response on Al7075 were investigated. It is demonstrated that Beryl particles distributed homogeneously in the Al7075 matrix acts as effective reinforcement to enhance the mechanical properites. Compared to base Al7075 matrix, Al7075- 6 wt.% Beryl composites exhibited higher yield strength of 47.42%, ultimate tensile strength of 44.08% and Al7075-8Wt.% enhancement in hardness of 27.71% when compared to momlithic Al7075. As cast Al7075 alloy and Al7075-Beryl composites were microstructurally characterized with scanning electron microscopy (SEM), Energy dispersive spectrum (EDS) and X-ray diffraction (XRD). Microstructure study through scanning electron microscope study reveals that the uniform distribution reinforcement Beryl into Al7075 matrix. The Al7075- Beryl.

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