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- W4252238168 abstract "This chapter discusses the hardness of a material, which is a parameter describing its ability to withstand penetration by a surface contact. Although it would be desirable to determine hardness in terms of the intrinsic factors, it is instrumentally impossible to separate intrinsic and extrinsic effects completely. For static hardness testing of ceramics, diamond indenters with different geometries are driven into the specimen surface, an indentation is produced, and the hardness is determined by the indentation size. The elastic and plastic deformation modes, which control hardness, depend on elastic modulus, on the mobility of dislocations, and hence on structural features. At low temperatures, dislocation movement during indentation occurs only by athermal mechanisms, whereas at high temperatures, deformation is thought to be dominated by dislocation glide, dislocation climb, and diffusion. The load-application time for indentation can have a marked influence on the resulting hardness value. The hardness of ceramics is determined by complex interrelationships between processes occurring on indentation. Hardness is used as quasi-non-destructive testing in the quality control of components. It is used to predict the wear behavior of ceramic surfaces. Under wear and abrasive conditions, the near-surface deformations are generally similar to those during indentation." @default.
- W4252238168 created "2022-05-12" @default.
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- W4252238168 date "1991-01-01" @default.
- W4252238168 modified "2023-10-09" @default.
- W4252238168 title "Hardness" @default.
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- W4252238168 doi "https://doi.org/10.1016/b978-0-08-034720-2.50060-5" @default.
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