Guide for Categorization of Microstructural and Microtextural Features Observed in Optical Micrographs of Graphite

10.1520/d8075 ◽  
2020 ◽  
Author(s):  
Keyword(s):  
Optical Micrographs

Macroprobe Mode for the Study of Segregation in Steels

1990 ◽  
Vol 48 (2) ◽  
pp. 260-261
Author(s):  
Auclair Gilles ◽  
Benoit Danièle
Keyword(s):  
Mechanical Properties ◽  
Spatial Distribution ◽  
High Performance ◽  
Volume Fraction ◽  
Sheet Steel ◽  
Acquisition Time ◽  
Chemical Information ◽  
X Ray ◽  
Accurate Quantitative Analysis ◽  
Optical Micrographs

During these last 10 years, high performance correction procedures have been developed for classical EPMA, and it is nowadays possible to obtain accurate quantitative analysis even for soft X-ray radiations. It is also possible to perform EPMA by adapting this accurate quantitative procedures to unusual applications such as the measurement of the segregation on wide areas in as-cast and sheet steel products.The main objection for analysis of segregation in steel by means of a line-scan mode is that it requires a very heavy sampling plan to make sure that the most significant points are analyzed. Moreover only local chemical information is obtained whereas mechanical properties are also dependant on the volume fraction and the spatial distribution of highly segregated zones. For these reasons we have chosen to systematically acquire X-ray calibrated mappings which give pictures similar to optical micrographs. Although mapping requires lengthy acquisition time there is a corresponding increase in the information given by image anlysis.

Quantifying patterns in optical micrographs of one- and two-dimensional ellipsoidal particle assemblies

Soft Matter ◽  
2020 ◽  
Vol 16 (48) ◽  
pp. 10900-10909
Author(s):  
Veronica Grebe ◽  
Mingzhu Liu ◽  
Marcus Weck
Keyword(s):  
Two Dimensional ◽  
Ellipsoidal Particle ◽  
Colloidal Science ◽  
Particle Assemblies ◽  
Optical Micrographs

Current developments in colloidal science include the assembly of anisotropic colloids with broad geometric diversity.

Hot Filament CVD Growth of 4H-SiC Epitaxial Layers

2018 ◽  
Vol 924 ◽  
pp. 120-123 ◽  
Author(s):  
Bart van Zeghbroeck ◽  
Hannah Robinson ◽  
Ryan R. Brow
Keyword(s):  
Crystalline Material ◽  
Epitaxial Layers ◽  
Hot Filament Cvd ◽  
Growth Method ◽  
Cvd Growth ◽  
Diffraction Peaks ◽  
Sem Imaging ◽  
Hot Filament ◽  
First Time ◽  
Optical Micrographs

Hot filament CVD (HFCVD) growth of undoped 4H-SiC epitaxial layers on 100 mm n-type 4o-off 4H-SiC substrates is presented as an alternate growth method for the first time. High quality crystalline material with a low density of polytype inclusions has been demonstrated and characterized with optical micrographs, SEM imaging, micro-Raman measurements, and high resolution XRD. Typical growth rates are ~3 μm/hour. Double rocking omega scans revealed diffraction peaks with a FWHM of 23 arcsec.

scholarly journals Ray-based optical visualisation of complex birefringent structures including energy transport

Soft Matter ◽  
2019 ◽  
Vol 15 (18) ◽  
pp. 3659-3670 ◽  
Author(s):  
Guilhem Poy ◽  
Slobodan Žumer
Keyword(s):  
Ray Tracing ◽  
Energy Transport ◽  
Bright Field ◽  
Ray Tracing Method ◽  
Tracing Method ◽  
Optical Micrographs

We present a novel ray-tracing method in birefringent media able to accurately simulate bright-field and polarised optical micrographs.

Scanning acoustic microscopy of partly embedded cracks in polycrystalline alumina

1986 ◽  
Vol 320 (1554) ◽  
pp. 237-241 ◽  
Keyword(s):  
Optical Microscope ◽  
Acoustic Microscopy ◽  
Polished Surface ◽  
Scanning Acoustic Microscopy ◽  
Optimum Conditions ◽  
Frame Size ◽  
Polycrystalline Alumina ◽  
Microscope Images ◽  
Optical Micrographs ◽  
Scanning Electron

Reflection scanning acoustic microscopy (SAM) at 1 GHz has been used to examine artificially induced cracks in alumina samples. The results are compared with the corresponding optical micrographs and scanning electron microscope images. For a sample with a 0.08 μm centre-line average (CLA) surface finish, the SAM working with a 400 μm frame size, showed that a crack that appeared to be about 150 μm in length in the corresponding optical image was, in fact, at least 200 μm in length. For a sample with a good engineering finish of 0.15 μm CLA, the SAM was able to reveal crack detail to a degree comparable with that revealed by an optical microscope working under optimum conditions. On a sample with a highly polished surface it was possible to distinguish between cracks and grain boundaries by using the V (z) response of the SAM, in agreement with theory.

Evaluation of the Susceptibility to Intergranular Corrosion for a Novel Cr-Mn-N Austenitic Stainless Steel Using DL-EPR

2013 ◽  
Vol 631-632 ◽  
pp. 192-197
Author(s):  
Lei Gang Zheng ◽  
Xiao Qiang Hu ◽  
Xiu Hong Kang ◽  
Dian Zhong Li
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Electrolyte Solution ◽  
Intergranular Corrosion ◽  
Xrd Analysis ◽  
Double Loop ◽  
Chromium Depletion ◽  
Electrochemical Potentiokinetic Reactivation ◽  
Epr Test ◽  
Optical Micrographs

The sensitization and intergranular corrosion (IGC) behavior of a novel Cr-Mn-N austenitic stainless steel (named as MPMD133) sensitized in the temperature range from 600 oC to 1000oC for 3 hours was investigated by the double loop electrochemical potentiokinetic reactivation (DL-EPR) test. The effects of the sensitization temperature on the susceptibility to IGC of MPMD133 were examined in the 0.5M H2SO4 +0.01M KSCN electrolyte solution. The results show that the degree of IGC increases as the sensitization temperature increasing till 900oC. Meanwhile it decreases rapidly when the sensitization temperature is elevated up to 1000oC, which is confirmed by the subsequent optical micrographs observation. The XRD analysis reveals that the precipitation of Cr23C6 leads to chromium depletion along the grain boundaries, consequently results in the susceptibility to IGC.

scholarly journals Charge-transfer interaction mediated organogels from 18β-glycyrrhetinic acid appended pyrene

2013 ◽  
Vol 9 ◽  
pp. 2877-2885 ◽  
Author(s):  
Jun Hu ◽  
Jindan Wu ◽  
Qian Wang ◽  
Yong Ju
Keyword(s):  
Electron Microscopy ◽  
Charge Transfer ◽  
Driving Forces ◽  
Variable Temperature ◽  
Mass Spectrometric ◽  
Glycyrrhetinic Acid ◽  
H Nmr ◽  
Two Component ◽  
Optical Micrographs ◽  
Scanning Electron

We describe herein the two-component charge-transfer (CT) interaction induced organogel formation with 18β-glycyrrhetinic acid appended pyrene (GA-pyrene, 3) as the donor, and 2,4,7-trinitrofluorenone (TNF, 4) as the acceptor. The use of TNF (4) as a versatile electron acceptor in the formation of CT gels is demonstrated through the formation of gels in a variety of solvents. Thermal stability, stoichiometry, scanning electron microscopy (SEM), optical micrographs, and circular dichroism (CD) are performed on these CT gels to investigate their thermal and assembly properties. UV–vis, fluorescence, mass spectrometric as well as variable-temperature 1H NMR experiments on these gels suggest that the CT interaction is one of the major driving forces for the formation of these organogels.

Void Content Measurements in Commingled E-Glass/ Polypropylene Composites Using Image Analysis from Optical Micrographs

2002 ◽  
Vol 10 (2) ◽  
pp. 77-90 ◽  
Author(s):  
C. Santulli, ◽  
R.Garcia Gil, ◽  
A.C. Long, ◽  
M. J. Clifford,
Keyword(s):  
Image Analysis ◽  
Void Content ◽  
Polypropylene Composites ◽  
Optical Micrographs
Sign in / Sign up

Export Citation Format

Share Document