Design of damage tolerant and crack-free layered ceramics with textured microstructure

Anna Katherina Hofer, Rebecca Walton, Oldřich Ševeček, Gary L. Messing, Raul Bermejo

Research output: Contribution to journalArticle

Abstract

This work demonstrates damage tolerant behavior of ceramic laminates designed with residual stresses and free of surface edge cracks. Non-periodic architectures were designed by embedding 2 textured alumina (TA) layers between 3 equiaxed alumina-zirconia (AZ) layers. Compressive residual stresses of ∼ 250 MPa were induced in the textured layers. Indentation strength tests showed that textured compressive layers arrested the propagation of cracks. Results were compared to periodic architectures with the same volume ratio of TA and AZ materials. Crack propagation was arrested in both periodic and non-periodic designs; the minimum threshold-strength being higher in the latter. Non-periodic architectures with compressive layers as thin as ∼ 200 μm showed no evidence of surface edge cracks, yet still reached minimum threshold strength values of ∼ 300 MPa. In addition, the textured microstructure promoted crack bifurcation in the thin compressive layers and thus enhanced the damage tolerance of the material.

Original languageEnglish (US)
Pages (from-to)427-435
Number of pages9
JournalJournal of the European Ceramic Society
Volume40
Issue number2
DOIs
StatePublished - Feb 2020

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Aluminum Oxide
Alumina
Cracks
Microstructure
Zirconia
Residual stresses
Damage tolerance
Compressive stress
Indentation
Laminates
Crack propagation
zirconium oxide

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Hofer, Anna Katherina ; Walton, Rebecca ; Ševeček, Oldřich ; Messing, Gary L. ; Bermejo, Raul. / Design of damage tolerant and crack-free layered ceramics with textured microstructure. In: Journal of the European Ceramic Society. 2020 ; Vol. 40, No. 2. pp. 427-435.
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Design of damage tolerant and crack-free layered ceramics with textured microstructure. / Hofer, Anna Katherina; Walton, Rebecca; Ševeček, Oldřich; Messing, Gary L.; Bermejo, Raul.

In: Journal of the European Ceramic Society, Vol. 40, No. 2, 02.2020, p. 427-435.

Research output: Contribution to journalArticle

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