Hot Explosive Consolidation of W-Ti Alloys: Microstructural Effects

2001 ◽  
Author(s):  
Laszlo J. Kecskes
Keyword(s):  
Ti Alloys ◽  
Microstructural Effects ◽  
Explosive Consolidation

Hot explosive consolidation of W-Ti alloys

1995 ◽  
Vol 26 (9) ◽  
pp. 2407-2414 ◽  
Author(s):  
Laszlo J. Kecskes ◽  
Ian W. Hall
Keyword(s):  
Ti Alloys ◽  
Explosive Consolidation

High Voltage Transmission Microscopy of Surveyor III Camera Shrouds

1971 ◽  
Vol 29 ◽  
pp. 138-139
Author(s):  
W. R. Duff ◽  
L. E. Thomas ◽  
R. M. Fisher ◽  
S. V. Radcliffe
Keyword(s):  
Alloy Sheet ◽  
Transmission Microscopy ◽  
Television Camera ◽  
Window Method ◽  
Transmission Electron ◽  
Microstructural Effects ◽  
Lunar Environment ◽  
Successful Retrieval ◽  
Materials Used ◽  
Abrasive Paper

Successful retrieval of the television camera and other components from the Surveyor III spacecraft by the Apollo 12 astronauts has provided a unique opportunity to study the effects of a known and relatively extensive exposure to the lunar environment. Microstructural effects including those produced by micro-meteorite impact, radiation damage (by both the solar wind and cosmic rays) and solar heating might be expected in the materials used to fabricate the spacecraft. Samples received were in the form of 1 cm2 of painted unpainted aluminum alloy sheet from the top of the camera visor (JPL Code 933) and the sides (935,936) and bottom (934) of the lower camera shroud. They were prepared for transmission electron microscopy by first hand-grinding with abrasive paper to a thickness of 0.006". The edges were lacquered and the sample electropolished in 10% perchloric methanol using the “window” method, to a thickness of ~0.001". Final thinning was accomplished by polishing 3 mm punched disks in an acetic-phosphoric-nitric acid solution.

Direct Observation of the Diffusionless β → β + ω Transformation in Titanium Alloys

1971 ◽  
Vol 29 ◽  
pp. 122-123
Author(s):  
N. E. Paton ◽  
D. de Fontaine ◽  
J. C. Williams
Keyword(s):  
Electron Microscope ◽  
Titanium Alloys ◽  
Direct Observation ◽  
Dark Field ◽  
X Ray Diffraction ◽  
Resistivity Measurements ◽  
Selected Area Electron Diffraction ◽  
Ti Alloys ◽  
Thin Foils ◽  
Field Device

The electron microscope has been used to study the diffusionless β → β + ω transformation occurring in certain titanium alloys at low temperatures. Evidence for such a transformation was obtained by Cometto et al by means of x-ray diffraction and resistivity measurements on a Ti-Nb alloy. The present work shows that this type of transformation can occur in several Ti alloys of suitable composition, and some of the details of the transformation are elucidated by means of direct observation in the electron microscope.Thin foils were examined in a Philips EM-300 electron microscope equipped with a uniaxial tilt, liquid nitrogen cooled, cold stage and a high resolution dark field device. Selected area electron diffraction was used to identify the phases present and the ω-phase was imaged in dark field by using a (101)ω reflection. Alloys were water quenched from 950°C, thinned, and mounted between copper grids to minimize temperature gradients in the foil.

Low-temperature annealing of YBa2Cu3O7-x

1992 ◽  
Vol 50 (1) ◽  
pp. 88-89
Author(s):  
R.L. Sabatini ◽  
Yimei Zhu ◽  
Masaki Suenaga ◽  
A.R. Moodenbaugh
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Temperature ◽  
Oxygen Diffusion ◽  
Diffusion Rate ◽  
Oxygen Depletion ◽  
Low Temperature Annealing ◽  
Transmission Electron ◽  
Microstructural Effects ◽  
Oxygen Diffusion Rate

Low temperature annealing (<400°C) of YBa2Cu3O7x in a ozone containing oxygen atmosphere is sometimes carried out to oxygenate oxygen deficient thin films. Also, this technique can be used to fully oxygenate thinned TEM specimens when oxygen depletion in thin regions is suspected. However, the effects on the microstructure nor the extent of oxygenation of specimens has not been documented for specimens exposed to an ozone atmosphere. A particular concern is the fact that the ozone gas is so reactive and the oxygen diffusion rate at these temperatures is so slow that it may damage the specimen by an over-reaction. Thus we report here the results of an investigation on the microstructural effects of exposing a thinned YBa2Cu3O7-x specimen in an ozone atmosphere using transmission electron microscopy and energy loss spectroscopy techniques.

AN ATOM-PROBE STUDY OF Fe-Ti ALLOYS

1984 ◽  
Vol 45 (C9) ◽  
pp. C9-417-C9-422
Author(s):  
A. Jimbo ◽  
T. Hashizume ◽  
T. Sakurai ◽  
K. Al-Saleh ◽  
H. W. Pickering
Keyword(s):  
Atom Probe ◽  
Ti Alloys

MAGNETIC PROPERTIES OF AMORPHOUS Fe-Ti ALLOYS PRODUCED BY FACING TARGET TYPE SPUTTERING

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1275-C8-1276
Author(s):  
K. Sumiyama ◽  
H. Yasuda ◽  
Y. Nakamura
Keyword(s):  
Magnetic Properties ◽  
Target Type ◽  
Ti Alloys

MICROSTRUCTURAL EFFECTS ON THE PERMEABILITY OF NITROCELLULOSE MEMBRANES FOR PAPER DIAGNOSTICS

2018 ◽  
Author(s):  
Shanyouming Sun ◽  
Shangsheng Feng ◽  
Feng Xu ◽  
Changchun Ji ◽  
Meng Shi ◽  
...  
Keyword(s):  
Microstructural Effects ◽  
Paper Diagnostics
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