By Albert G. Ingalls

Fresh publication. quantity three HARDCOVER. send swifter FROM TX.

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L. Johnson, Contact Mechanics, Cambridge University Press, Cambridge, 1985. 30. B. Pethica, “Microhardness tests with penetration depths less than ion implanted layer thickness in ion implantation into metals,” Third International Conference on Modification of Surface Properties of Metals by Ion-Implantation, Manchester, England, 23-26, 1981, V. Ashworth et al. , Pergammon Press, Oxford, 1982, pp. 147–157. 31. S. Field, “Understanding the penetration resistance of modified surface layers,” Surface and Coatings Technology, 36, 1988, pp.

The tip radius of a typical diamond pyramidal indenter is in the order of 100 nm (Courtesy CSIRO). The Berkovich indenter,1 (a) in Fig. 1, is generally used in small-scale indentation studies and has the advantage that the edges of the pyramid are more easily constructed to meet at a single point, rather than the inevitable line that occurs in the four-sided Vickers pyramid. 3o, which gives the same projected area-to-depth ratio as the Vickers indenter. 03o, and this gives the same actual surface area to depth ratio as a Vickers indenter in accordance with the definition of the Vickers hardness value.

1Y. Theoretical treatment of events within Region 2 is difficult because of the uncertainty regarding the size and shape of the evolving plastic zone. At high values of indentation strain (Region 3), the mode of deformation appears to depend on the type of indenter and the specimen material. The presence of the free surface has an appreciable effect, and the plastic deformation within the specimen is such that, assuming no work hardening, little or no increase in pm occurs with increasing indenter load.

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