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Grain Boundary Nanohardness of Coarse Grain Alumina
Author(s) -
Dey Arjun,
Bhattacharya Manjima,
Mukhopadhyay Anoop K.
Publication year - 2014
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12351
Subject(s) - materials science , nanoindentation , grain boundary , ceramic , grain size , grain boundary strengthening , amorphous solid , phase (matter) , alumina ceramic , composite material , metallurgy , microstructure , crystallography , chemistry , organic chemistry
Here, we present the results of nanoindentation experiments conducted at ultralow peak loads of, for example, 1000, 5000, and 10,000 μN on a dense (~99.5%), coarse grain (~10 μm) alumina ceramic. The results showed that the nanohardness values of alumina were sensitive to the applied loads as well as to the locations of measurements, for example, the center of the grain, away from the center of the grain and at the vicinity of the grain boundary. The location sensitivity of nanohardness was linked to compositional variations of the different locations and to the presence of an amorphous phase.