Characterization of Serrated Grain Boundaries in Ni-Based Alloy 690

2014 ◽  
Vol 52 (9) ◽  
pp. 695-704
Author(s):  
Yun Soo Lim ◽  
Dong Jim Kim ◽  
Seong Sik Hwang
Keyword(s):  
Grain Boundaries ◽  
Alloy 690

High-resolution electron microscopy of nanostructured materials

1995 ◽  
Vol 53 ◽  
pp. 172-173
Author(s):  
M. José-Yacamán
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Grain Boundaries ◽  
Nanostructured Materials ◽  
High Resolution Electron Microscopy ◽  
Hrem Image ◽  
Small Particles ◽  
Resolution Electron ◽  
Nanophase Materials

Electron microscopy is a fundamental tool in materials characterization. In the case of nanostructured materials we are looking for features with a size in the nanometer range. Therefore often the conventional TEM techniques are not enough for characterization of nanophases. High Resolution Electron Microscopy (HREM), is a key technique in order to characterize those materials with a resolution of ~ 1.7A. High resolution studies of metallic nanostructured materials has been also reported in the literature. It is concluded that boundaries in nanophase materials are similar in structure to the regular grain boundaries. That work therefore did not confirm the early hipothesis on the field that grain boundaries in nanostructured materials have a special behavior. We will show in this paper that by a combination of HREM image processing, and image calculations, it is possible to prove that small particles and coalesced grains have a significant surface roughness, as well as large internal strain.

scholarly journals Characterization of grain boundaries in silicon

1983 ◽  
Author(s):  
L. Cheng ◽  
C. Shyu ◽  
K. Stika ◽  
G. Crotty
Keyword(s):  
Grain Boundaries

scholarly journals A Tool for Local Thickness Determination and Grain Boundary Characterization by CTEM and HRTEM Techniques

2015 ◽  
Vol 21 (2) ◽  
pp. 422-435 ◽  
Author(s):  
Ákos K. Kiss ◽  
Edgar F. Rauch ◽  
Béla Pécz ◽  
János Szívós ◽  
János L. Lábár
Keyword(s):  
Grain Boundaries ◽  
Software Tool ◽  
Hexagonal Crystal ◽  
Electron Microscopic ◽  
Orientation Data ◽  
New Approach ◽  
Polycrystalline Thin Films ◽  
Transmission Electron ◽  
Transmission Electron Microscopic

AbstractA new approach for measurement of local thickness and characterization of grain boundaries is presented. The method is embodied in a software tool that helps to find and set sample orientations useful for high-resolution transmission electron microscopic (HRTEM) examination of grain boundaries in polycrystalline thin films. The novelty is thesimultaneoustreatment of the two neighboring grains and orienting both grains and the boundary planesimultaneously. The same metric matrix-based formalism is used for all crystal systems. Input into the software tool includes orientation data for the grains in question, which is determined automatically for a large number of grains by the commercial ASTAR program. Grain boundaries suitable for HRTEM examination are automatically identified by our software tool. Individual boundaries are selected manually for detailed HRTEM examination from the automatically identified set. Goniometer settings needed to observe the selected boundary in HRTEM are advised by the software. Operation is demonstrated on examples from cubic and hexagonal crystal systems.

Interfaces In Glass-Containing Ceramics

1999 ◽  
Vol 5 (S2) ◽  
pp. 98-99
Author(s):  
C. Barry Carter ◽  
N. Ravishankar ◽  
Carsten Korte ◽  
M.P. Mallamaci
Keyword(s):  
Grain Boundaries ◽  
Strong Dependence ◽  
Solid Substrate ◽  
Special Boundaries ◽  
Intergranular Films ◽  
The Subject ◽  
Microscopy Techniques ◽  
Sintered Oxide ◽  
Microstructural Examination

The interaction of a liquid with a solid substrate has been the subject of intense research since the early 1800s. The subject is relevant and very important even today from a basic science as well as technological standpoint. Liquid-phase-sintered oxide ceramics often contain a siliceous glassy layer in the grain boundaries which affect the properties of the ceramic. The wetting of the grain boundaries by the liquid has a strong dependence on the crystallography. While some boundaries are preferably wet, other special boundaries appear to be completely ‘dry’. The presence of the liquid film also affects the faceting behavior of the boundary plane. While several studies have been carried out on these intergranular glass films, many of the basic issues still remain unclear. The development of modern microscopy techniques facilitate the characterization of structure and chemistry at a high spatial resolution. This paper deals with the microstructural examination of two of the important issues involved with these intergranular films, i.e., faceting of grain boundaries in the presence of a glassy phase and the behavior of interfaces between two glassy phases of different compositions.

scholarly journals Influence of crystal orientation and Berkovich tip rotation on the mechanical characterization of grain boundaries in molybdenum

2019 ◽  
Vol 182 ◽  
pp. 107998 ◽  
Author(s):  
S. Jakob ◽  
A. Leitner ◽  
A. Lorich ◽  
M. Eidenberger-Schober ◽  
W. Knabl ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Crystal Orientation ◽  
Mechanical Characterization ◽  
Tip Rotation

Electrical characterization of grain boundaries in GaAs

1983 ◽  
Vol 54 (3) ◽  
pp. 1429-1440 ◽  
Author(s):  
Michael G. Spencer ◽  
William J. Schaff ◽  
D. Ken Wagner
Keyword(s):  
Grain Boundaries ◽  
Electrical Characterization

SIMS/AEM Characterization of Banded Microstructures in an Ni-Cr-Fe Alloy

1999 ◽  
Vol 5 (S2) ◽  
pp. 862-863 ◽  
Author(s):  
M.G. Burke ◽  
B.Z. Hyatt ◽  
G. McMahon
Keyword(s):  
Aging Temperature ◽  
Single Phase ◽  
Alloy 600 ◽  
Solution Annealing ◽  
Grain Sizes ◽  
Treated Condition ◽  
Alloy 690 ◽  
Fe Alloys ◽  
Thermally Treated

Ni-Cr-Fe alloys such as Alloy 600 and Alloy 690 are single phase fee alloys with excellent resistance to corrosion. Alloy 600 is generally used in a thermally-treated condition which is characterized by the intergranular precipitation of Cr-rich M7C3 and, depending upon the aging temperature, Cr-rich M23C6. These alloys are usually cast and processed by rolling or forging. These alloys can exhibit microstructures in which there are nonuniform distributions of intragranular carbides that appear as bands aligned parallel to the working direction (i.e. longitudinal) of the material. It is also possible for these materials to exhibit duplex grain sizes which can be associated with the banded carbide structure. Banded microstructures can become more prominent after further anneals. The resistance of the carbide bands to dissolution during solution annealing at temperatures up to 1150°C has prompted the further evaluation of banding in Alloy 600, specifically in terms of identifying those elements associated with the carbide bands.

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