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Reversible dislocation motion and microcracking in plastically anisotropic solids under cyclic spherical nanoindentation

Published online by Cambridge University Press:  30 September 2013

B. Anasori  and
M.W. Barsoum
B. Anasori*
Affiliation:
Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104
M.W. Barsoum
Affiliation:
Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104
*
Address all correspondence to B. Anasori atanasori@drexel.edu
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Abstract

Recently, fully reversible dislocation motion was postulated to result in hysteretic nanoindentation load–displacement loops in plastically anisotropic solids. Since microcracking can also result in hysteretic loops, here we define a new parameter, reversible displacement (RD) that can differentiate between the two. For C-plane LiTaO3 surfaces and five other plastically anisotropic solids, the RD values either increase initially or remain constant with cycling. In contradistinction, for glass and A-plane ZnO surfaces, where energy dissipation is presumably due to microcracking or irreversible dislocation pileups, respectively, the RD values decreased continually with cycling.

Type
Research Letters
Information
MRS Communications , Volume 3 , Issue 4 , December 2013 , pp. 245 - 248
Copyright
Copyright © Materials Research Society 2013 

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