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Knoop Microhardness Anisotropy of Single‐Crystal Rutile
Author(s) -
Li Hong,
Bradt Richard C.
Publication year - 1990
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.1151-2916.1990.tb05205.x
Subject(s) - knoop hardness test , indentation hardness , rutile , anisotropy , materials science , cleavage (geology) , slip (aerodynamics) , single crystal , shear (geology) , critical resolved shear stress , mineralogy , crystallography , composite material , geology , chemistry , optics , thermodynamics , microstructure , physics , fracture (geology) , shear rate , paleontology , viscosity
Knoop microhardness profiles were determined for singlecrystal rutile on the (100), (001), (110), and (111) for test loads from 50 to 300 g. The profiles were related to the slip systems as they determine the corresponding effective resolved shear stress (ERSS) diagrams according to the concepts advanced by Brookes and co‐workers. Several previously reported slip systems were confirmed while slip on the {111̄} <101> was also suggested. Cleavage of rutile on the {110} and {100} was substantiated. The load dependence of the microhardness was addressed in terms of the classical Meyer's law, P = Ad n . The n values were between 1.53 and 1.77, varying with the crystallographic planes and directions. However, no obvious systematic variation was evident.