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Initiation of Dislocation Systems in Alumina Under Single-point Scratching

Published online by Cambridge University Press:  31 January 2011

Irena Zarudi  and
Liangchi Zhang
Irena Zarudi
Affiliation:
Department of Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales 2006, Australia
Liangchi Zhang*
Affiliation:
Department of Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales 2006, Australia
*
a)Address all correspondence to this author.
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Abstract

This paper aims to investigate the initiation and distribution of dislocations and twins in the subsurface of alumina subjected to single-point scratching and to gain a deeper understanding of the mechanisms of ductile-regime grinding of alumina. It found that there generally exist three regions of dislocation and twin systems in the scratched alumina. The first region contains five independent slip systems so that macroscopic plastic flow is possible there. In the second and third regions, not all the systems can be activated, and then microcracking in the subsurface may occur easily. The distribution of these regions varies with the grain size of alumina. In the 25 μm-grained alumina all three regions appear. Thus, in this case, microcracking is difficult to avoid. In the 1 μm-grained alumina, however, only the first region appears, indicating that the material may be scratched under a real ductile mode without microcracking. A comparison shows that theoretical predictions are in good agreement with experimental observations.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1430 - 1436
Copyright
Copyright © Materials Research Society 1999

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References

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