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

  • B. Anasori (a1) and M.W. Barsoum (a1)


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.

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MRS Communications
  • ISSN: 2159-6859
  • EISSN: 2159-6867
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