Detection of several ω-phase morphologies in β-III Ti by small-angle neutron scattering and transmission electron microscopy

1983 ◽  
Vol 48 (4) ◽  
pp. 479-500 ◽  
Author(s):  
M. Fatemi ◽  
C. S. Pande ◽  
H. R. Child
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Ω Phase ◽  
Transmission Electron

Structural characterization of manganese-substituted nanocrystalline zinc oxide using small-angle neutron scattering and high-resolution transmission electron microscopy

2009 ◽  
Vol 42 (6) ◽  
pp. 1085-1091 ◽  
Author(s):  
B. Roy ◽  
B. Karmakar ◽  
J. Bahadur ◽  
S. Mazumder ◽  
D. Sen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Zinc Oxide ◽  
High Resolution ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

A series of zinc oxide (ZnO) nanoparticles, substituted with manganese di-oxide, have been synthesized through a modified ceramic route using urea as a fuel. X-ray diffraction and high-resolution transmission electron microscopy studies indicate that the sizes of the ZnO particles are of nanometer dimension. Particles remain as single phase when the doping concentration is below 15 mol%. Small-angle neutron scattering indicates fractal-like agglomerates of these nanoparticles in powder form. The size distributions of the particles have been estimated from scattering experiments as well as microscopy studies. The average particle size estimated from small-angle scattering experiments was found to be somewhat more than that obtained from X-ray diffraction or electron microscopy measurement.

Detection of new co phase morphologies in β-III Ti using transmission electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 266-267
Author(s):  
C. S. Pande ◽  
M. Fatemi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Phase Transformation ◽  
Cooling Rate ◽  
Diffraction Pattern ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Bright Field ◽  
Ω Phase ◽  
Transmission Electron

The to phase transformation in titanium and other alloys has been extensively studied1. This phase has an hep structure with three atoms per cell located at (000), (1/3, 2/3, 1/2) and (2/3, 1/3, 1/2). ‘Isothermal’ ω phase precipitates are oriented in the bec β matrix such that [lll]β ‖ [0001]ω and [110]β ‖ω. In fact four varients of such an ω phase exist oriented in all four [111] directions. Isothermal ω phase has been studied as a displacement controlled growth as distinct from another type of ω phase (as quenched) which is produced by a dif fusionless transformation resulting from a very rapid cooling rate.Using transmission electron microscopy (TEM) and small angle neutron scattering (SANS) we have detected and identified two previously unreported morphologies in β-III Ti (Ti-11.0 Mo-6.0 Zr-4.5 Sn-0.15 O2). Fig. 1 shows a TEM micrograph of a conventional ‘isothermal’ ω precipitate (obtained by annealing β-III Ti 20 hours at 400°C) imaged in bright field with its diffraction pattern showing hep spots as well as the brighter spots of the bec matrix. The long axis of the precipitates is oriented along a [111] direction.

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