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Lattice Misorientation and Displaced Volume for Microhardness Indentations in MgO Crystals
Author(s) -
ARMSTRONG R. W.,
WU C. Cm.
Publication year - 1978
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1978.tb09248.x
Subject(s) - indentation , materials science , indentation hardness , misorientation , scanning electron microscope , diamond , crystallography , work hardening , composite material , mineralogy , microstructure , chemistry , grain boundary
Diamond pyramid indentations on (001) surfaces were studied by X‐ray diffraction microscopy and scanning electron microscopy. These methods reveal the patterns of internal strains and external surface relief, respectively, which accompany various deformation (and cracking) processes at the indentation sites. These processes are controlled by the formation of sessile 〈110〉 dislocations which prevent additional straining of the crystals along [001]. The results provide evidence that the local crystal work‐hardening behavior is important in determining the microhardness values.