Evaluating a Critical Resolved Shear Stress Criterion for Domain Nucleation in Ferroelastic Ceramics

42 Pages Posted: 3 Jun 2020

See all articles by Charles S. Smith

Charles S. Smith

University of Illinois at Urbana-Champaign - Department of Materials Science and Engineering

Quentin Rizzardi

University of Illinois at Urbana-Champaign - Department of Materials Science and Engineering

Robert Maaß

Independent

Jessica A. Krogstad

University of Illinois at Urbana-Champaign - Frederick Seitz Materials Research Laboratory

Abstract

The mechanical behavior of single crystal, ferroelastic, tetragonal, ceria-titania-stabilized zirconia is evaluated through uniaxial micro-scale compression experiments. The deformed single crystal micropillars exhibit characteristics of several deformation modes, including twinning (ferroelastic domain nucleation), dislocation plasticity, and microcracking. Following earlier work that revealed how the onset of twinning obeys a critical resolved shear-stress law, much akin to Schmid's law, we test this model and show that it does not hold for the data presented herein. We ascribe this discrepancy to the fact that multiple deformation mechanisms can be active in different micropillars and even in the same micropillars at room temperature, which is revealed by transmission electron microscopy. Whilst little is known about the potential interactions between these mechanisms at such low homologuous temperatures, their coexistence implies that crystal orientation alone is not sufficient to predict ferroelastic domain nucleation behavior in small-scale single crystals.

Keywords: ferroelastic, twinning, single crystal, ceramics, deformation

Suggested Citation

Smith, Charles S. and Rizzardi, Quentin and Maaß, Robert and Krogstad, Jessica A., Evaluating a Critical Resolved Shear Stress Criterion for Domain Nucleation in Ferroelastic Ceramics. Available at SSRN: https://ssrn.com/abstract=3606818 or http://dx.doi.org/10.2139/ssrn.3606818

Charles S. Smith

University of Illinois at Urbana-Champaign - Department of Materials Science and Engineering

601 E John St
Champaign, IL 61820
United States

Quentin Rizzardi

University of Illinois at Urbana-Champaign - Department of Materials Science and Engineering ( email )

601 E John St
Champaign, IL 61820
United States

Robert Maaß

Independent

Jessica A. Krogstad (Contact Author)

University of Illinois at Urbana-Champaign - Frederick Seitz Materials Research Laboratory ( email )

Urbana, IL
United States

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