Cracking during indentation in Sialon-based ceramics: kinetic microhardness and acoustic emission

Recent investigations using kinetic microhardness measurements in Sialon-based ceramics suggested that the nucleation of median cracks under the indenter can be registered using a contact microhardness tester. The purpose of this study was to investigate this theory using acoustic emission during in...

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Bibliographic Details
Published in:Journal of materials science letters 1996-06, Vol.15 (11), p.987-990
Main Authors: Yurkov, A L, Breval, E, Bradt, R C
Format: Article
Language:English
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Summary:Recent investigations using kinetic microhardness measurements in Sialon-based ceramics suggested that the nucleation of median cracks under the indenter can be registered using a contact microhardness tester. The purpose of this study was to investigate this theory using acoustic emission during indentation. The investigated material was a Sialon ceramic Y-Si-Al-O-N. The acoustic emission measurements during Vickers indentation and inflexions in Meyer's index plots proved that median cracks nucleate under the indenter at about 3 N. At loads above about 16 N these cracks propagate and visible radial cracks are evident at about 20 N. 9 refs.
ISSN:0261-8028
1573-4811
DOI:10.1007/BF00241445