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Revealing the Plastic Mode of Time-Dependent Deformation of a LiTaO 3 Single Crystal by Nanoindentation

Authors
  • Zhou, Shengyun1, 2
  • Huang, Xianwei1
  • Lu, Congda1, 2
  • Liu, Yunfeng1, 2
  • Zhang, Taihua
  • Ma, Yi1
  • 1 (Y.L.)
  • 2 Key Laboratory E&M, Zhejiang University of Technology, Ministry of Education & Zhejiang Province, Hangzhou 310014, China
Type
Published Article
Journal
Micromachines
Publisher
MDPI AG
Publication Date
Sep 21, 2020
Volume
11
Issue
9
Identifiers
DOI: 10.3390/mi11090878
PMID: 32967191
PMCID: PMC7569801
Source
PubMed Central
Keywords
Disciplines
  • Article
License
Green

Abstract

Recently, instrumental nanoindentation has been widely applied to detect time-dependent plastic deformation or creep behavior in numerous materials, particularly thin films and heterogeneous materials. However, deformation mechanism at nanoindentation holding stage has not been well revealed hitherto. In the current work, nanoindentation holding tests with high loads were performed on a brittle LiTaO3 single crystal. The surface morphologies of residual impressions with various holding times were investigated. It was indicated that generation of secondary cracks and propagation of both main and secondary cracks were the dominating mechanism for time-dependent plastic deformation at the initial holding stage, and the density and length of cracks were invariable at the steady-state holding stage, which suggested a nonlocalized plastic deformation beneath the indenter. It could be concluded that time-dependent plastic deformation of brittle ceramic under nanoindentation is composed of instant cracking as the continuation of loading sequence and homogeneous creep flow by high shear-compression stress at room temperature.

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