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The Mesostructure of Surface Layers of Metal Under Friction with Relatively High Contact Stress
Abstract Meso-level, which is on the scale of 0.1-1 μm, is known as the gap between nano- and macro-levels. From the structural point of view, it is the level of cells and fragments. These structures are formed in the surface layers of metal during friction, and they strongly affect tribological metal properties. Attention is being given to the following aspects of mesostructures formed during friction: (a) evolution of dislocation density and distribution: (b) formation of the boundaries of the fragments; (c) space and time-dependent changes of mesostructures in surface layers; (d) the role of mesostructures in strengthening surface layers of metal and their wear resistance. The relation between wear mechanisms and mesostructures formed in the surface layers of metals, and the role of fragments in hardening, negative hardening and failure of material under plastic deformation during friction, are discussed. The results of transmission electron microscopy (TEM) and X-ray diffraction (XRD) studies of mesostructures formed in the surface layers of metals are reported. Different levels of fragmentation have been observed, depending on both the kind of material, friction and wear conditions. Based on the properties of mesostructures formed during friction, some conclusions concerning the choice of optimal friction conditions are presented.
The Mesostructure of Surface Layers of Metal Under Friction with Relatively High Contact Stress
Abstract Meso-level, which is on the scale of 0.1-1 μm, is known as the gap between nano- and macro-levels. From the structural point of view, it is the level of cells and fragments. These structures are formed in the surface layers of metal during friction, and they strongly affect tribological metal properties. Attention is being given to the following aspects of mesostructures formed during friction: (a) evolution of dislocation density and distribution: (b) formation of the boundaries of the fragments; (c) space and time-dependent changes of mesostructures in surface layers; (d) the role of mesostructures in strengthening surface layers of metal and their wear resistance. The relation between wear mechanisms and mesostructures formed in the surface layers of metals, and the role of fragments in hardening, negative hardening and failure of material under plastic deformation during friction, are discussed. The results of transmission electron microscopy (TEM) and X-ray diffraction (XRD) studies of mesostructures formed in the surface layers of metals are reported. Different levels of fragmentation have been observed, depending on both the kind of material, friction and wear conditions. Based on the properties of mesostructures formed during friction, some conclusions concerning the choice of optimal friction conditions are presented.
The Mesostructure of Surface Layers of Metal Under Friction with Relatively High Contact Stress
Garbar, I.I. (author)
2001-01-01
7 pages
Article/Chapter (Book)
Electronic Resource
English
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