Enhanced Tensile Properties of Graphene-Al5083 Composite Prepared by Hot Pressing and Hot Extrusion

2016 ◽  
Vol 849 ◽  
pp. 424-429
Author(s):  
Hai Ping Zhang ◽  
Wen Long Xiao ◽  
Kei Ameyama ◽  
Guo Fu Ji ◽  
Ming Juan Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
Tensile Elongation ◽  
Hot Extrusion ◽  
Powder Metallurgy Method ◽  
Test Results ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
Vacuum Oven ◽  
Transmission Electron

Graphene, with outstanding mechanical properties of 1TPa of Young’s modulus and 130GPa of tensile strength, has been considered as an excellent reinforcement in composites. Graphene nanoplates (GNP) reinforced Al5083 alloy composites were successfully fabricated by powder metallurgy method. Flake-like Al5083 powder was firstly added into a GNP-alcohol solution and then dried in vacuum oven at 343 K for 5 h. The composite powders were sintered at 723K under pressure of 300 MPa for 1 h, followed by extrusion at 623 K. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed for microstructure characterization. Al4C3 cannot be observed in the composite, suggesting that there was no reaction occurred between GNP and Al matrix during the processing. Tensile test results revealed that the ultimate tensile strength and tensile elongation of 0.3wt.%GNP/Al5083 composites were 580MPa and 15%, respectively, showing optimal combination of strength and ductility. The relevant strengthening mechanisms of the composites were discussed.

Preparation of PVC/Kaolin Nanocomposites through Solid State Shear Compounding Based on Pan-Milling

2011 ◽  
Vol 694 ◽  
pp. 350-354 ◽  
Author(s):  
Kan She Li ◽  
Ying Hong Chen ◽  
Hong Mei Niu ◽  
Jian Jun Chen
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
Solid State ◽  
Impact Strength ◽  
Ambient Temperature ◽  
Mechanical Tests ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Filled Composite

Solid state shear compounding technology (S3C) based on pan-milling is an effective method to prepare polymer/layered mineral composites with nano intercalating structure. The PVC/Kaolin compounding powders were successfully prepared by pan-milling at ambient temperature, and then the PVC/Kaolin nanocomposites were processed by moulding The structure and properties of PVC/Kaolin compounding powder and nanocomposites were investigated by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and mechanical tests. The results showed that the mechanical properties of PVC/Kaolin nanocomposites prepared through S3C based on pan-milling 30 cycles at ambient temperature including elongation, tensile strength and notched impact strength were remarkably improved compared with conventional filled composites. The elongation of PVC / Kaolin nanocomposites with 4 %wt. Kaolin was 274.6%, which is 187.3 % higher than that for a conventional filled composite. The tensile strength was 54.0 MPa, which is 6.3 MPa higher than that for a conventional filled composite. The tensile strength of the nanocomposites with 8 %wt. Kaolin was 57.5 MPa, which is 9.1 MPa higher than that for a conventional filled composite. At the same time, the notched impact strength was 4.9 kJ/m2, which is 1.0 kJ/m2 higher than a conventional filled composite. Strengthening and toughening for PVC were synchronously realized. XRD, SEM and TEM verified that S3C based on pan-milling realized synchronously pulverizing, dispersion and compounding of PVC with kaolin Through 25-30 cycles pan-milling, PVC and Kaolin powders imbedded each other and made into uniform PVC/Kaolin compounding powders and nanocomposites. The strip flake of Kaolin particles with thickness less than 50 nanometer and the aspect ratio of 10 times dispersed homogeneously in the PVC matrix.

Structure and Magnetic Properties of the Co-Ni Alloy Nanowires Prepared by AC Electrodeposition

2013 ◽  
Vol 787 ◽  
pp. 372-375 ◽  
Author(s):  
X. Wen ◽  
Y. Zhang ◽  
X.X. Zhang ◽  
G.H. Yue ◽  
D.L. Peng
Keyword(s):  
Electron Microscopy ◽  
Magnetic Measurements ◽  
Porous Alumina ◽  
Test Results ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Anodic Porous Alumina ◽  
Ni Alloy ◽  
Axis Parallel ◽  
Alloy Nanowires

Ordered Co-Ni nanowires have been fabricated by alternating current (AC) electrodeposition method using anodic porous alumina as a template. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) test results reveal that the samples are polycrystalline with uniform diameters around 50 nm and lengths up to several micrometers. X-ray diffraction (XRD) pattern indicate the crystalline structure change from fcc to hcp as the Co composition increasing. Magnetic measurements show that the nanowires have high magnetic anisotropy with their easy axis parallel to the nanowire arrays. The coercivity (Hc) and squareness (Mr/Ms) are found to increase with the increase of ferromagnetic Co component.

Effects of Co content in TiO2–Co composite prepared by alloying–recomposition–oxidation–sintering process on its mechanical properties and microstructure

2019 ◽  
Vol 53 (24) ◽  
pp. 3483-3495
Author(s):  
Seungkyun Yim ◽  
Ilsong Park ◽  
Jeshin Park
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Diffraction Field ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
Transmission Electron ◽  
Content Range ◽  
Structural Characterizations

TiO2–Co composite powders with various Co contents were prepared by the alloying-recomposition-oxidation-sintering process. For comparison, conventionally mixed TiO2–Co composites with the same compositions were sintered at 1000, 1100, 1200, 1300, and 1400℃. Structural characterizations were performed using X-ray diffraction, field-emission scanning electron microscopy, energy-dispersive spectroscopy, and transmission electron microscopy. All of the sintered samples were more densified. A melted matrix was observed at a temperature higher than 1300℃. The flexural strength and the fracture toughness of the TCA sample were higher than those of the conventionally mixed TiO2–Co sample at the same sintering temperature, while the Vickers hardness exhibited the opposite relationship. The flexural strength and the fracture toughness of the TCA sample increased until a Co content of 14 vol%, followed by decrease at 18 vol%, while those of the conventionally mixed TiO2–Co sample increased in the entire Co content range. The highest flexural strength and fracture toughness were observed for T14CA sintered at 1400℃ (161.3 MPa and 6.39 MPa m−1/2, respectively). Consequently, the desirable Co content in the TiO2–Co composite prepared by the alloying–recomposition–oxidation–sintering process was 14 vol%.

scholarly journals Microstructure Characterization of SiC Reinforced Aluminium and Al4Cu Alloy Matrix Composites

2017 ◽  
Vol 62 (2) ◽  
pp. 747-755 ◽  
Author(s):  
B. Leszczyńska-Madej ◽  
A. Wąsik ◽  
M. Madej
Keyword(s):  
Electron Microscopy ◽  
Nitrogen Atmosphere ◽  
Powder Metallurgy Method ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Alloy Matrix ◽  
Transmission Electron ◽  
Composite Microstructure ◽  
Xrd Techniques

AbstractA conventional powder metallurgy method (PM) was used to produce Al-SiC and Al4Cu alloy matrix composites with 2.5, 5, 7.5 and 10 wt% of SiC particles. Two different sizes of the reinforcing phase particles were applied to determine their effect on composite microstructure. The sintering process was carried out at 600°C under nitrogen atmosphere, and its consequence was the appearance of aluminium nitrides in composite microstructure acting as an additional strengthening phase. The composites were next re-pressed and re-sintered (2p2s) under the same conditions. The main aim of this article was to examine the microstructure of the SiC reinforced Al and Al4Cu alloy matrix composites. To achieve this goal and characterize the sintered materials, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques were used.

Mechanical, microstructural properties and cell adhesion of Sr/Se-hydroxyapatite/graphene/polycaprolactone nanofibers

2020 ◽  
pp. 089270572091278 ◽  
Author(s):  
Reem Al-Wafi ◽  
SF Mansour ◽  
MK Ahmed
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
Microstructural Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nanofibrous Scaffolds ◽  
Transmission Electron ◽  
Fesem Micrographs

Electrospun nanofibrous scaffolds containing co-dopant of Sr/Se into carbonated hydroxyapatite has been synthesized in situ with graphene (G) nanosheets and carried on polycaprolactone at different contributions of G. The powder and the nanofibrous samples were investigated using X-ray diffraction, transmission electron microscopy, and field emission scanning electron microscopy (FESEM). The FESEM micrographs show that the highest content of G (0.2 G) was formed in non-oriented/rough/cracked fibers with diameters around 0.3–0.4 µm at the maximum. The tensile strength of nanofibrous scaffolds was improved with the addition of G nanosheets and the maximum tensile strength of 0.2 G was around 6.39 ± 0.24 MPa, while the minimum cell viability ratio was about 94.4 ± 3.2% for the free G nanofibers. The in vitro attachment of HFB4 cell lines was investigated and it showed that nanofibrous scaffolds have induced cells to be proliferated and spread on the nanofibrous scaffolds’ surface. This behavior of cells growth encourages more investigations for these nanofibrous scaffolds to be promoted for clinical applications.

Synthesis of Bi0.5Sb1.5Te3/Graphene Composite Powders

2013 ◽  
Vol 743-744 ◽  
pp. 83-87
Author(s):  
B.B. Liang ◽  
Y. Li ◽  
L.L. Xu ◽  
L.J. Wang ◽  
W. Jiang
Keyword(s):  
Electron Microscopy ◽  
Active Sites ◽  
Synthesis Method ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
X Ray ◽  
Graphene Composite ◽  
Transmission Electron ◽  
Different Content

In this paper, Bi0.5Sb1.5Te3/graphene composite powders were prepared by hydrothermal synthesis method. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were used to characterize the morphology and structure of the composite powders. As a nanocomposite phase, graphene provided plenty of charge carriers and active sites for nucleation of Bi0.5Sb1.5Te3 grains. Bi0.5Sb1.5Te3 particles aggregated and attached to the surfaces of graphene randomly. In addition, it was found that the sizes of Bi0.5Sb1.5Te3 particles varied with different content of graphene. The formation mechanism of Bi0.5Sb1.5Te3/graphene composite powders was discussed.

Bonding Strength and Microstructure of Cermet/Cu-Based Alloy Composite Brazed Coatings

2005 ◽  
Vol 297-300 ◽  
pp. 154-159 ◽  
Author(s):  
Xin Hong Wang ◽  
Zeng Da Zou ◽  
Min Zhang ◽  
Si Li Song ◽  
Shi Yao Qu
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
Composite Coatings ◽  
Wear Property ◽  
Alloy Composite ◽  
X Ray Diffraction ◽  
Interfacial Diffusion ◽  
X Ray ◽  
Transmission Electron ◽  
The Matrix

WC-TiC-Co cermet and CuZnNi alloy composite coatings were produced on mild steel by a high temperature inside-furnace brazing technique. The microstructure, phase constituents and interfacial diffusion behavior of cermet and Cu-based alloy were investigated by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron probe microanalysis (EPMA) and X-ray diffraction. The tensile strength and wear property of composite coatings were also investigated. The results show that crème particles were not decomposed severely during the inside- furnace brazing process. The microstructure of the matrix is α and β phases. Diffusion occurred at the cermet/Cu-based alloy interface. The tensile strength of the composite coatings reached 240-300MPa, which depended on the brazing temperature and was far higher than that of the flame hardfacing layers. Cermet fracture was basically a brittle fracture in nature and matrix involves ductile fracture.

Development and characterization of novel polybutylene nanocomposites

2016 ◽  
Vol 51 (1) ◽  
pp. 95-108 ◽  
Author(s):  
Khaled Alfadhel ◽  
Adam Al-Mulla ◽  
Bader Al-Busairi
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
Initial Period ◽  
Mechanical Analysis ◽  
X Ray Diffraction ◽  
Elongation At Break ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
The Matrix

Polybutylene/starch/nanoclay composite blends were prepared by melt extrusion technique. Maleic anhydride grafted polybutylene was used as a compatibilizer. The nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, atomic force microscopy, rheological, and mechanical analysis. Addition of compatibilizer to the polybutylene/starch/nanoclay showed dispersion and nucleation related to the nanoclay in the polybutylene matrix. An increase in the mechanical properties like modulus and tensile strength at break and a decrease in the elongation at break were observed on the addition of compatibilizer to the matrix compared to that of uncompatibilized matrix. The biodegradability of the nanocomposites was studied using the landfill burial test. The blends subjected to the burial test were evaluated for their tensile properties. The results revealed that the tensile strength and elongation at break of the compatibilized nanocomposites decreased after 80 days of land burial test compared to the initial period.

scholarly journals Spherical Li4Ti5O12/NiO Composite With Enhanced Capacity and Rate Performance as Anode Material for Lithium-Ion Batteries

2020 ◽  
Vol 8 ◽  
Author(s):  
Jiequn Liu ◽  
Shengkui Zhong ◽  
Qingrong Chen ◽  
Luchao Meng ◽  
Qianyi Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Discharge Capacity ◽  
Lithium Ion ◽  
Drying Method ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
X Ray ◽  
Transmission Electron

Compositing with metal oxides is proved to be an efficient strategy to improve electrochemical performance of anode material Li4Ti5O12 for lithium-ion batteries. Herein, spherical Li4Ti5O12/NiO composite powders have been successfully prepared via a spray drying method. X-ray diffraction and high-resolution transmission electron microscopy results demonstrate that crystal structure of the powders is spinel. Scanning electron microscopy results show that NiO uniformly distributes throughout Li4Ti5O12 matrix. It is found that compositing with NiO increases both discharge platform capacity and rate stability of Li4Ti5O12. The as-prepared Li4Ti5O12/NiO (5%) exhibits a high initial discharge capacity of 381.3 mAh g−1 at 0.1 C, and a discharge capacity of 194.7 mAh g−1 at an ultrahigh rate of 20 C.

Microstructure and Mechanical Properties of Spray-Deposited Zn-30Al-1Cu Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 264-267
Author(s):  
Feng Wang ◽  
Bai Qing Xiong ◽  
Yon Gan Zhang ◽  
Hong Wei Liu ◽  
Zhi Hui Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Tensile Tests ◽  
Chinese Script ◽  
Spray Atomization ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure And Mechanical Properties ◽  
Transmission Electron

In this study, Zn-30Al-1Cu alloy was synthesized by the spray atomization and deposition technique. The microstructure and mechanical properties of the alloy were studied using optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and tensile tests. It can be seen that the microstructure of spray-deposited Zn-30Al-1Cu alloy is composed of the Zn/Al eutectoids and few compounds. The Zn/Al eutectoids were shown lamellar, particle and Chinese script morphologies. The compound phases in the microstructure of the spray-deposited alloy were examined. The property test results indicate that the spray-deposited Zn-30Al-1Cu alloy displays superior tensile strength.

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