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Identification of fracture sequences during sharp indentation of polycrystalline Al2O3

Published online by Cambridge University Press:  03 March 2011

Kaiyang Zeng  and
David Rowcliffe
Kaiyang Zeng
Affiliation:
Materials Science and Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden
David Rowcliffe
Affiliation:
Materials Science and Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

The effects of loading and unloading rate on fracture features formed during sharp indentation of polycrystalline Al2O3 have been studied. It was found that there is a transition between intergranular and transgranular fracture if the loading rate is increased by a factor of 104 during the whole indentation cycle. By varying the loading or unloading rate during indentation, and correlating the corresponding dependence of fracture features, the part of the indentation cycle can be identified in which specific segments of cracks are generated. Hence, the fracture sequence during indentation is established. The fracture sequence for polycrystalline Al2O3 is compared with those reported from direct observation in optically transparent materials such as soda-lime glass and various single crystal ceramics.

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Articles
Information
Journal of Materials Research , Volume 9 , Issue 7 , July 1994 , pp. 1693 - 1700
Copyright
Copyright © Materials Research Society 1994

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