X-ray Tomographic Characterization of Natural Polymer Composites and Correlation of Bulk Mechanical Properties

2009 ◽  
Vol 1219 ◽  
Author(s):  
Anahita Pakzad ◽  
Paul Mainwaring ◽  
Patricia A. Heiden ◽  
Reza Shahbazian Yassar
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Clear Correlation ◽  
Natural Polymer ◽  
Microscopy Imaging ◽  
X Ray ◽  
Nanomechanical Properties ◽  
The Matrix ◽  
A New Technique

AbstractIn this research, cellulose micro-crystals (CMC) were used to reinforce a bio-polymer, polycaprolactone (PCL). Mechanical properties were tested using nanoindentation. Electron microscopy imaging and a new technique called x-ray ultra microscopy and microtomography (XuM) were used to investigate the distribution of the filler in the matrix. We could demonstrate a clear correlation between the spatial distribution of CMC-PCL composites and their nanomechanical properties.

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.

Characterization of C-S-H and C-A-S-H phases by electron microscopy imaging, diffraction, and energy dispersive X-ray spectroscopy

2017 ◽  
Vol 100 (4) ◽  
pp. 1733-1742 ◽  
Author(s):  
Christiane Rößler ◽  
Frank Steiniger ◽  
Horst-Michael Ludwig
Keyword(s):  
Electron Microscopy ◽  
Energy Dispersive ◽  
Microscopy Imaging ◽  
X Ray

Characterization of Ti-xNb (x = 25 – 35) Alloys in as Melt and Annealed States

2019 ◽  
Vol 946 ◽  
pp. 287-292
Author(s):  
Alexander Thoemmes ◽  
Ivan V. Ivanov ◽  
Alexey Ruktuev
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Α Phase ◽  
Nb Content ◽  
Scanning Electron

The effect of Nb content on microstructure, mechanical properties and phase formation in as-melt and annealed binary Ti-Nb alloys were investigated using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis. The content of Nb varied in the range 25-35 mass % leading to significant changes in the microstructure. The annealed and furnace-cooled binary Ti-Nb samples exhibited HCP martensitic α` phase at a Nb content below 27.5 mass % and metastable BCC β phase at higher contents of Nb. The mechanical properties of alloys depended strongly on the Nb content and type of the dominating phase.

Effect of Ca on Microstructure and Properties of Mg-Al-Si Alloys

2011 ◽  
Vol 194-196 ◽  
pp. 1369-1373 ◽  
Author(s):  
Chun Xiang Xu ◽  
Hui Ju ◽  
Yang Zhou
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Chinese Script ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ca Addition ◽  
The Matrix ◽  
Morphology Modification ◽  
Scanning Electron

Effect of Ca addition on the morphology modification in Mg-7Al-0.8Zn-0.2Mn-1Si (AS71) alloys has been investigated using X-ray diffraction (XRD), optical microscopy (OM), and scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and various testing machines. The results show that when adding 0.1 wt% Ca, a small fraction of Mg2Si change from Chinese script type to polygonal type; with the Ca addition up to 0.3 wt%, edges and angles of polygonal type Mg2Si phase are changed; further increase in Ca addition, the morphology of Mg2Si is changed to strip-like or spot-like one. Meanwhile, the addition of Ca results in the morphology of β- Mg17Al12 phase changing from discontinuous net-like to dispersive island-like. Ca exists as solid-soluting atomic in the matrix with small Ca addition while in the form of CaSi2 with large Ca addition. Optimal mechanical properties can be achieved when Ca addition is 0.3 wt%.

Characterization of Polycarbonate/Multiwalled Carbon Nanotube Composites

2006 ◽  
Vol 326-328 ◽  
pp. 1829-1832 ◽  
Author(s):  
Hun Sik Kim ◽  
Byung Hyun Park ◽  
Min Sung Kang ◽  
Jin San Yoon ◽  
Hyoung Joon Jin
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Multiwalled Carbon ◽  
Melt Compounding ◽  
Matrix Strength ◽  
The Matrix ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
Scanning Electron

Polycarbonate/multiwalled carbon nanotubes (PC/MWNT) nanocomposites with different contents of MWNT were successfully prepared by melt compounding. The mechanical properties of the PC/MWNT nanocomposites were effectively increased due to the incorporation of MWNTs. The composites were characterized using scanning electron microscopy in order to obtain the information on the dispersion of MWNT in the polymeric matrix. In case of 0.3 wt% of MWNT in the matrix, strength and modulus of the composite increased by 30% and 20%, respectively. In addition, the dispersion of MWNTs in the PC matrix resulted in substantial decrease in the electrical resistivity of the composites as the MWNTs loading was increased from 1.0 wt% to 1.5 wt%.

Microstructure Characterization of Tungsten Based Alloys for Fusion Application

2013 ◽  
Vol 58 (2) ◽  
pp. 473-476 ◽  
Author(s):  
G. Cempura ◽  
A. Kruk ◽  
C. Thomser ◽  
M. Wirtz ◽  
A. Czyrska-Filemonowicz
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Electron Tomography ◽  
Analytical Electron Microscopy ◽  
Large Scatter ◽  
Fine Grained ◽  
Analytical Electron ◽  
The Matrix ◽  
Strengthening Particles

The microstructure of two tungsten based alloys (W-1.1%TiC and W-1.7% TiC) was characterized using light microscopy, analytical electron microscopy and electron tomography. These alloys represent a class of W based dispersion strengthened alloys with TiC used as strengthening particles. Addition of TiC leads to improved creep resistance and tensile strength of the W based alloys. The results show that the W-1.7%TiC alloy exhibits large scatter in grain size, much higher porosity and contains also Ti-O particles. The W-1.1%TiC alloy has fine grained microstructure with uniformly distributed fine TiC particles within the matrix and low porosity. As a result of the different microstructure, the W-1.1%TiC alloy exhibits better mechanical properties, when compared to the W-1.7%TiC alloy.

Microstructural and Mechanical Properties of Polyester/Nanoclay Nanocomposites: Microstructure-Mixing Strategy Correlation

2011 ◽  
Vol 1312 ◽  
Author(s):  
Hamid Dalir ◽  
Rouhollah D. Farahani ◽  
Vireya Nhim ◽  
Benjamin Samson ◽  
Martin Lévesque ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Fracture Strain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Roll Mill ◽  
The Matrix ◽  
Polyester Matrix ◽  
Excellent Improvement

ABSTRACTDifferent nanoclay mixing strategies using a three-roll mill and ultrasonication is proposed to obtain the desired polyester/nanoclay dispersion, intercalation, and exfoliation. The dispersion states of the modified nanoclay in polymer with 2, 4 and 6 wt% loading were characterized with X-ray diffraction, scanning electron microscopy (SEM), and low and high magnification transmission electron microscopy (TEM). The mechanical properties of the clay-reinforced polyester nanocomposites were a function of the nature and the content of the clay in the matrix. The nanocomposite containing 4 wt% modified Cloisite® 15A exhibits excellent improvement in modulus (by ~51%) and tensile strength (by ~12%) with a decrease in fracture strain (by ~26%) and fracture energy (by ~17%). These mechanical characteristic changes can be attributed to the dispersion, intercalation, and exfoliation of the nanoclays inside the polyester matrix.

Physical and Mechanical Properties of Nylon 6/ Titanium Dioxide Micro and Nano-Composite Multifilament Yarns

2014 ◽  
Vol 9 (3) ◽  
pp. 155892501400900
Author(s):  
Shima Shayestehfar ◽  
Mohammad Esmail Yazdanshenas ◽  
Ramin Khajavi ◽  
Abo-Saeed Rashidi
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Physical And Mechanical Properties ◽  
Nylon 6 ◽  
Nano Particles ◽  
X Ray ◽  
Transmission Electron ◽  
Multifilament Yarns

In this study, the effect of titanium dioxide particles (TiO2 micro and nano) on the physical and mechanical properties of Nylon 6–based multifilament yarns was investigated. For this reason, master-batches of Nylon 6/TiO2 micro and nano-particles were prepared by melt compounding before spinning and then multifilament composites incorporating 0.03, 0.33, 0.5 and 0.7% TiO2 micro and nano-particles were successfully spun in a melt-spinning machine. Characterization of these composite multifilament yarns was carried out using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive x-ray (EDX), and X-ray diffraction (XRD) analysis. Characterization of mechanical strength properties including tenacity and elongation at break of the resultant composites are discussed as a function of filler loading. Through the application of scanning electron microscopy (SEM) and transmission electron microscopy (TEM), it was found that incorporating micro titanium dioxide caused severe aggregation at the nylon fiber surface. By contrast, the diffusion of nano-particles within bulk of multifilament yarns was much more consistent, although aggregation of the titanium dioxide nano-particles still appeared. The results manifested the improvement of mechanical properties of the nano-composites containing TiO2 nano-particles.

Preparation and Characterization of Thermoplastic Vulcanizates-Organoclay Nanocomposites

2005 ◽  
Vol 480-481 ◽  
pp. 333-338 ◽  
Author(s):  
B. Herrero ◽  
M. Arroyo ◽  
Miguel A. López-Manchado
Keyword(s):  
Mechanical Properties ◽  
X Ray Diffraction ◽  
Ethylene Propylene ◽  
X Ray ◽  
Modified Montmorillonite ◽  
Thermoplastic Vulcanizates ◽  
The Matrix ◽  
Silicate Layers ◽  
Ethylene Propylene Diene Terpolymer

Thermoplastic vulcanizates nanocomposites based on polypropylene (PP) and ethylene–propylene-diene terpolymer rubber (EPDM) blends reinforced with organoclay modified montmorillonite have been prepared via melt intercalation. The silicate layers of the clay were intercalated and dispersed at a nanometer level in the matrix blends. The nanocomposites exhibit improved mechanical properties, this effect being more evident at high EPDM contents in the blend (above 80%). This behavior is attributed to the fact that the EPDM chains are more easily inserted into the galleries silicate, giving rise to a more intercalated structure as was observed by X-ray diffraction.

scholarly journals Structure Analysis and Properties of Unleaded Brasses

2015 ◽  
Vol 60 (1) ◽  
pp. 323-328 ◽  
Author(s):  
S. Rzadkosz ◽  
J. Kozana ◽  
A. Garbacz-Klempka ◽  
M. Piękoś
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Structure Analysis ◽  
Structure And Properties ◽  
X Ray ◽  
Ecological Characteristics ◽  
The Matrix ◽  
Scanning Electron

Abstract The analysis of brasses regarding their microstructure, mechanical properties and ecological characteristics has been presented. The influence of characteristic alloying elements contained in the brasses and the possibilities of replacing them with other elements have been assessed. The paper contains the results of studies on the influence of chosen additional elements shaping the structure and properties of unleaded alloys based on Cu-Zn system as the matrix. The research aimed at determining the mechanism and the intensity of influence of such additives as tellurium and bismuth. The microstructures were investigated with the help of light microscopy and scanning electron microscopy with X-ray microanalysis (SEM-EDS) for determining significant changes of the properties.

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