Microstructure and properties of surface-modified tungsten powders mechanically activated in different media

The results of an experimental-theoretical study of the effect of thin-film coatings on residual microstrains, microstresses, and local microdistortions of the atomic structure of powder tungsten mechanically activated in the centrifugal ball mill have been presented. It has been shown that microdis...

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Bibliographic Details
Published in:Physics of metals and metallography 2017-11, Vol.118 (11), p.1066-1072
Main Authors: Savenko, V. I., Toporov, Yu. P., Chernyshev, V. V., Malkin, A. I.
Format: Article
Language:English
Subjects:
Adsorption
Analysis
Atomic structure
Chemistry and Materials Science
Coating effects
Crystal structure
Diffusion
Materials Science
Metallic Materials
Phase Transformations
Powders (Particulate matter)
Structural hierarchy
Structure
Thin films
Tungsten
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Summary:The results of an experimental-theoretical study of the effect of thin-film coatings on residual microstrains, microstresses, and local microdistortions of the atomic structure of powder tungsten mechanically activated in the centrifugal ball mill have been presented. It has been shown that microdistortions of the crystal structure of different system-hierarchical levels arise in the surface-oxidized powders, which increase with an increase in the time of the activation process. It has been shown that this should lead to a significant increase in the reactivity of the mechanically activated powder tungsten. In contrast, the adsorption films that plasticize the near-surface layer of particles can decrease the efficiency of the mechanoactivation process of the tungsten powder.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X17110138