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Acoustic Emission Monitoring of Nanoindentation-Induced Slip and Twinning in Sapphire

Published online by Cambridge University Press:  11 February 2011

Natalia I. Tymiak ,
Antanas Daugela ,
Thomas J. Wyrobek  and
Oden L. Warren
Natalia I. Tymiak
Affiliation:
Hysitron, Inc., Minneapolis, MN 55439
Antanas Daugela
Affiliation:
Hysitron, Inc., Minneapolis, MN 55439
Thomas J. Wyrobek
Affiliation:
Hysitron, Inc., Minneapolis, MN 55439
Oden L. Warren
Affiliation:
Hysitron, Inc., Minneapolis, MN 55439
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Abstract

Monitoring with an Acoustic Emission (AE) sensor integrated into an indenter tip was utilized for the evaluation of the earliest stages of indentation-induced plasticity in sapphire single crystal. The evaluated surfaces included basal (C), rhombohedral (R) and two different prismatic orientations (A and M). The differences between the mechanisms of the initial stages of plasticity for the various crystallographic orientations were reflected in the following aspects of AE activity: detection of a specific type of AE waveform that correlated to the presence of linear surface features near the indentation impressions; AE signal associated with the yield point, consisting either of one or two distinct waveforms; and presence or absence of AE signals after the yield point. Moreover, analysis of AE activity revealed loading rate effects on the yield point mechanism for the M plane. The possibility of plasticity onset mechanisms involving both slip and twinning is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 750: Symposium Y – Surface Engineering 2002–Synthesis, Characterization and Applications , 2002 , Y2.3
Copyright
Copyright © Materials Research Society 2003

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References

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