Microstructural Analysis of SiO2-Al2O3 Glasses

1982 ◽  
Vol 40 ◽  
pp. 562-563
Author(s):  
C. M. Jantzen ◽  
D. G. Howitt
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Microstructural Analysis ◽  
Liquid Immiscibility ◽  
Metastable Region ◽  
Transmission Electron ◽  
Liquidus Temperatures

The mullite-SiO2 liquidus has been extensively studied, and it has been shown that the flattening of the liquidus is related to the existence of a metastable region of liquid immiscibility at sub-liquidus temperatures which is detectable by transmission electron microscopy (TEM) (Fig. 1).

Scanning Transmission Electron Microscopy Studies of the Microstructure of High Chromium Steel after Long Time Exposure

2013 ◽  
Vol 212 ◽  
pp. 25-28 ◽  
Author(s):  
Kinga B. Rodak ◽  
Adam Hernas
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Scanning Transmission Electron Microscopy ◽  
Microstructural Analysis ◽  
Chromium Steel ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Δ Ferrite ◽  
Scanning Transmission ◽  
Long Time

The detailed microstructural analysis of HCM12 steel after long time (100 000 hours) exposure at service temperatures around 600°C was investigated by means of scanning transmission electron microscopy. The results show, that the recovery processes of the martensite lath structure and δ ferrite are significantly different. Moreover are differences in particles precipitating at the martensite and δ ferrite. The intensive process intragranular M23C6 and Laves particles precipitating is observed at the martensite/ δ ferrite interfaces.

Microstructural analysis of high-pressure compressed C60

2001 ◽  
Vol 16 (7) ◽  
pp. 1960-1966 ◽  
Author(s):  
K. Miyazawa ◽  
H. Satsuki ◽  
M. Kuwabara ◽  
M. Akaishi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Pressure ◽  
High Resolution ◽  
Microstructural Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Hardness Tests ◽  
Lattice Planes

The structure and hardness of C60 bulk specimens compressed under 5.5 GPa at room temperature to 600 °C are investigated by high-resolution transmission electron microscopy, x-ray diffraction, and micro-Vickers hardness tests. A strong accumulation of the [1 1 0]tr orientation of high-pressure-treated C60 specimens was developed along the compression axis, and stacking faults and nano-sized deformation twins were introduced into the C60 specimens compressed at 450–600 °C. Curved lattice planes indicating a polymerization of C60 were observed by high resolution transmission electron microscopy (HRTEM). The polymerization of the high-pressure-compressed C60 is also supported by the computer simulation of HRTEM images.

Plastic deformation in icosahedral Al–Pd–Mn alloys

1994 ◽  
Vol 9 (2) ◽  
pp. 343-347 ◽  
Author(s):  
J.E. Shield ◽  
M.J. Kramer ◽  
R.W. McCallum
Keyword(s):  
Electron Microscopy ◽  
Activation Energy ◽  
Transmission Electron Microscopy ◽  
Stress Exponent ◽  
Microstructural Analysis ◽  
High Temperature Creep ◽  
Deformation Characteristics ◽  
Cast Sample ◽  
Dislocation Glide ◽  
Transmission Electron

The deformation characteristics of icosahedral Al70Pd21.5Mn8.5 have been investigated by high temperature creep experiments, and the resultant microstructures have been examined by transmission electron microscopy (TEM). From 730 to 780 °C, microstructural analysis revealed that the deformation is controlled by dislocation glide, with an activation energy of 210 ± 30 kJ/mole and a stress exponent of 1.2 ± 0.2. From 780 to 810 °C, microstructures were characteristic of deformation controlled by dislocation glide and climb. The activation energy and stress exponent were determined to be 1700 ± 80 kJ/mole and 2.9 ± 0.3, respectively. Hardness measurements also reflected an increase in dislocation density, as the hardness of the deformed samples was approximately 10% higher than the as-cast sample.

Synthesis and Microstructural Analysis of Si3N4 Nanorods

2002 ◽  
Vol 8 (1) ◽  
pp. 5-10 ◽  
Author(s):  
Y.H. Gao ◽  
Y. Bando ◽  
K. Kurashima ◽  
T. Sato
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Activated Carbon ◽  
Carbothermal Reduction ◽  
Microstructural Analysis ◽  
Microstructural Characterization ◽  
X Ray ◽  
Transmission Electron ◽  
Closest Packing

α-Si3N4 nanorods with 20–80 nm width were synthesized by carbothermal reduction of SiO with amorphous activated carbon (AAC) as a reductant. Microstructural characterization of the synthesized nanorods was carried out by high resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray analysis. Many Si3N4 nanorods were found to be twisted. Each twisted nanorod contained several straight Si3N4 parts. The straight parts had the rod axes orientated along the 〈1010〉 direction, which is the closest packing direction of α-Si3N4. There were two kinds of joints between the two adjacent straight Si3N4 parts. Formation mechanism of the Si3N4 nanorods is discussed.

Microstructural Analysis of Hexagonal Close-Packed Metals Using X-Ray Diffraction and Transmission Electron Microscopy

1990 ◽  
Vol 209 ◽  
Author(s):  
M. Griffiths ◽  
J.E. Winegar
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Diffraction Analysis ◽  
Microstructural Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hexagonal Close Packed ◽  
Direct Observations ◽  
Transmission Electron

ABSTRACTThe techniques employed for X-ray diffraction analysis of dislocation substructures in hexagonal close-packed metals are descibed and assessed by comparison with direct observations using transmission electron microscopy.

scholarly journals Microstructural Analysis of Dehydrogenation Products of the Ca(BH4)2–MgH2 Composite

2013 ◽  
Vol 19 (S5) ◽  
pp. 149-151
Author(s):  
Jong-Min Kim ◽  
Yoonyoung Kim ◽  
Jae-Hyeok Shim ◽  
Young-Su Lee ◽  
Jin-Yoo Suh ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Uniform Distribution ◽  
Microstructural Analysis ◽  
Transmission Electron

AbstractThe microstructural analysis of the dehydrogenation products of the Ca(BH4)2–MgH2 composite was performed using transmission electron microscopy. It was found that nanocrystalline CaB6 crystallites formed as a dehydrogenation product throughout the areas where the signals of Ca and Mg were simultaneously detected, in addition to relatively coarse Mg crystallites. The uniform distribution of the nanocrystalline CaB6 crystallites appears to play a key role in the rehydrogenation of the dehydrogenation products, which implies that microstructure is a crucial factor determining the reversibility of reactive hydride composites.

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