Structure changes of powder composites surface layers in sliding under electric current and Pb-Sn melt in the contact space

2020 ◽  
Author(s):  
M. I. Aleutdinova ◽  
V. V. Fadin
Keyword(s):  
Electric Current ◽  
Surface Layers ◽  
Structure Changes ◽  
Powder Composites ◽  
Contact Space

Structure changes in the surface layers of Ti-6Al-4V titanium alloy under electron beam treatment

2017 ◽  
Author(s):  
Elena Sinyakova ◽  
Alexey Panin ◽  
Olga Perevalova ◽  
Marina Kazachenok ◽  
Yurii Ivanov ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Electron Beam Treatment ◽  
Surface Layers ◽  
Structure Changes

On self-organization of the surface layer of structural steel in dry sliding against quenched steel under electric current

2021 ◽  
pp. 29-37
Author(s):  
M. I. Aleutdinova
Keyword(s):  
Structural Steel ◽  
Electric Current ◽  
Hardened Steel ◽  
Self Organization ◽  
Confocal Laser ◽  
Dry Sliding ◽  
Surface Layers ◽  
X Ray ◽  
Quenched Steel ◽  
Two Sectors

Using optical and confocal laser microscopes it was shown that dry sliding of structural steel against hardened steel under electric current of density higher 250 A/cm2 was accompanied by the formation of composite tribolayers. By X-ray phase analysis of the surface layers of the sample and counterbody was shown that they contain α-Fe, γ-Fe, and FeO. It is noted that the self-organization of the tribosystem under conditions of dry sliding under electric current can be represented as a hierarchy of structural states of the surface layers of contacting materials. It was found that the nominal sample area had two sectors. The character of the contact interaction in the sectors differs from each other.

Electric Current Effect on Metal Surface Layers

1989 ◽  
Vol 151 (1) ◽  
pp. 121-126 ◽  
Author(s):  
A. M. Roshchupkin ◽  
I. L. Bataronov ◽  
O. A. Troitskii ◽  
M. M. Moiseenko
Keyword(s):  
Electric Current ◽  
Metal Surface ◽  
Current Effect ◽  
Surface Layers ◽  
Electric Current Effect

Comments on collision mechanics in ring systems

1984 ◽  
Vol 75 ◽  
pp. 407-422
Author(s):  
William K. Hartmann
Keyword(s):  
Asteroid Belt ◽  
Surface Erosion ◽  
Surface Layers ◽  
Ring Systems ◽  
Eclipse Observations ◽  
Saturn’S Rings ◽  
Saturn's Rings

ABSTRACTThe nature of collisions within ring systems is reviewed with emphasis on Saturn's rings. The particles may have coherent icy cores and less coherent granular or frosty surface layers, consistent with thermal eclipse observations. Present-day collisions of such ring particles do not cause catastrophic fragmentation of the particles, although some minor surface erosion and reaccretion is possible. Evolution by collisional fragmentation is thus not as important as in the asteroid belt.

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

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