scholarly journals Growth Behaviour of Athermal ω-Phase Crystals in a Ti-15mass%Mo Alloy Studied by In-situ Dark Field and High Resolution Electron Microscopy

1999 ◽  
Vol 40 (12) ◽  
pp. 1436-1443 ◽  
Author(s):  
Hajime Matsumoto ◽  
Eiichi Sukedai ◽  
Hatsujiro Hashimoto
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
High Resolution Electron Microscopy ◽  
Dark Field ◽  
Omega Phase ◽  
Growth Behaviour ◽  
Resolution Electron

High resolution electron microscopy observation of interfacial structures in NiAl-matrix in situ composites reinforced by TiC particulates

1997 ◽  
Vol 12 (7) ◽  
pp. 1790-1795 ◽  
Author(s):  
L. G. Yu ◽  
J. Y. Dai ◽  
Z. P. Xing ◽  
D. X. Li ◽  
J. T. Guo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
High Resolution Electron Microscopy ◽  
Amorphous Layer ◽  
Interfacial Layers ◽  
Resolution Electron ◽  
Interfacial Structures ◽  
Tic Particulates ◽  
Nial Matrix

The structures of interfaces in NiAl-matrix in situ composites reinforced by TiC particulates were studied by means of high-resolution electron microscopy (HREM). No consistent orientation relationship between TiC particles and the NiAl matrix was found. In most cases, TiC particles bonded well to the NiAl matrix free from any interfacial phases. However, in some cases, an interfacial amorphous layer with a thickness of about 3 nm was found. The annealed NiAl–TiC composite showed a good chemical compatibility between the TiC particles and the NiAl matrix, though, some interfacial layers between TiC and NiAl, which were determined to be C-deficient TiC, were found. NiAl precipitates were observed in the TiC particles of the annealed specimens.

High Resolution TEM Studies On Palladium, Rhodium Nanoparticles

2001 ◽  
Vol 7 (S2) ◽  
pp. 1100-1101
Author(s):  
M. José-Yacamán ◽  
M. Marín-Almazo ◽  
J.A. Ascencio
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Indirect Evidence ◽  
High Resolution Electron Microscopy ◽  
Dark Field ◽  
Rhodium Nanoparticles ◽  
Resolution Electron ◽  
Annular Dark Field ◽  
High Resolution Tem ◽  
Important Field

The field of catalysis is one of the most important areas of the nano-sciences for many years. in deed the goal of having a catalyst, with the maximum active area exposed to a chemical reaction, has produced enormous amount of research in nanoparticles. Particularly, the metal nanoparticles study is a very important field in catalysis. Electron Microscopy is one of the techniques that have played a mayor role on studding nanoparticles. Since bright field images, dark field techniques, to the high-resolution atomic images of nanoparticles and more recently the High Angle Annular dark field images or Z-contrast. However this technique provides only indirect evidence of the atomic arrangements on the particles. High Resolution Electron Microscopy (HREM) still appears as a very powerful technique to study nanoparticles and their internal structure. Among the most interesting metals to study is the palladium, which acts for instance as excellent catalyst for hydrogenation of unsaturated hydrocarbons and has many other applications such as environmental catalysts.

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