Size-dependence of zirconia-based ceramics via deformation twinning

H. Zhang; H. Gu; J. Jetter; E. Quandt; R. D. James; J. R. Greer

doi:10.1016/j.eml.2020.101124

Size-dependence of zirconia-based ceramics via deformation twinning

H. Zhang, H. Gu, J. Jetter, E. Quandt, R. D. James, J. R. Greer

Aerospace Engineering and Mechanics

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Contrary to the dislocation-driven ‘smaller-is-stronger’ size-effect in nanocrystals, the size-dependence of strength in deformation twinning, another carrier of plasticity, still lacks universal understanding. Deformation twinning enables pseudoplastic strain of >5% in a shape memory ceramic (ZrHfO₄)_x (YTaO₄)_1−x. We use diffraction methods, microstructure analysis, and in-situ nanomechanical experiments to uncover contributing factors to the competition between twinning and slip in these submicron-sized ionic crystals, revealing power-law scaling of strength with size for both mechanisms. The significant twinning size-dependence was found to follow a superimposed power-law with exponent of -1, identical to that in metals. These findings unveil the universality of the superimposed power-law size-effect for twinning in single-crystals and provide new insights on deformability of ceramics and microstructure-driven nano-plasticity.

Original language	English (US)
Article number	101124
Journal	Extreme Mechanics Letters
Volume	42
DOIs	https://doi.org/10.1016/j.eml.2020.101124
State	Published - Jan 2021

Bibliographical note

Funding Information:
HZ and JRG gratefully acknowledges the financial support from the U.S. Department of Basic Energy Sciences under Grant DE-SC0006599 . HG and RDJ acknowledge the support of a Vannevar Bush Faculty Fellowship, USA . EQ and JJ acknowledge support by the German Research Foundation (DFG) via a Reinhart Koselleck project (Project number 313454214).

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

Crystallography
Deformation twinning
In-situ nanomechanics
Plasticity
Shape memory ceramics

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10.1016/j.eml.2020.101124

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title = "Size-dependence of zirconia-based ceramics via deformation twinning",

abstract = "Contrary to the dislocation-driven {\textquoteleft}smaller-is-stronger{\textquoteright} size-effect in nanocrystals, the size-dependence of strength in deformation twinning, another carrier of plasticity, still lacks universal understanding. Deformation twinning enables pseudoplastic strain of >5% in a shape memory ceramic (ZrHfO4)x (YTaO4)1−x. We use diffraction methods, microstructure analysis, and in-situ nanomechanical experiments to uncover contributing factors to the competition between twinning and slip in these submicron-sized ionic crystals, revealing power-law scaling of strength with size for both mechanisms. The significant twinning size-dependence was found to follow a superimposed power-law with exponent of -1, identical to that in metals. These findings unveil the universality of the superimposed power-law size-effect for twinning in single-crystals and provide new insights on deformability of ceramics and microstructure-driven nano-plasticity.",

keywords = "Crystallography, Deformation twinning, In-situ nanomechanics, Plasticity, Shape memory ceramics",

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note = "Funding Information: HZ and JRG gratefully acknowledges the financial support from the U.S. Department of Basic Energy Sciences under Grant DE-SC0006599 . HG and RDJ acknowledge the support of a Vannevar Bush Faculty Fellowship, USA . EQ and JJ acknowledge support by the German Research Foundation (DFG) via a Reinhart Koselleck project (Project number 313454214). Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

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language = "English (US)",

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AU - Gu, H.

AU - Jetter, J.

AU - Quandt, E.

AU - James, R. D.

AU - Greer, J. R.

N1 - Funding Information: HZ and JRG gratefully acknowledges the financial support from the U.S. Department of Basic Energy Sciences under Grant DE-SC0006599 . HG and RDJ acknowledge the support of a Vannevar Bush Faculty Fellowship, USA . EQ and JJ acknowledge support by the German Research Foundation (DFG) via a Reinhart Koselleck project (Project number 313454214). Publisher Copyright: © 2020 Elsevier Ltd

PY - 2021/1

Y1 - 2021/1

N2 - Contrary to the dislocation-driven ‘smaller-is-stronger’ size-effect in nanocrystals, the size-dependence of strength in deformation twinning, another carrier of plasticity, still lacks universal understanding. Deformation twinning enables pseudoplastic strain of >5% in a shape memory ceramic (ZrHfO4)x (YTaO4)1−x. We use diffraction methods, microstructure analysis, and in-situ nanomechanical experiments to uncover contributing factors to the competition between twinning and slip in these submicron-sized ionic crystals, revealing power-law scaling of strength with size for both mechanisms. The significant twinning size-dependence was found to follow a superimposed power-law with exponent of -1, identical to that in metals. These findings unveil the universality of the superimposed power-law size-effect for twinning in single-crystals and provide new insights on deformability of ceramics and microstructure-driven nano-plasticity.

AB - Contrary to the dislocation-driven ‘smaller-is-stronger’ size-effect in nanocrystals, the size-dependence of strength in deformation twinning, another carrier of plasticity, still lacks universal understanding. Deformation twinning enables pseudoplastic strain of >5% in a shape memory ceramic (ZrHfO4)x (YTaO4)1−x. We use diffraction methods, microstructure analysis, and in-situ nanomechanical experiments to uncover contributing factors to the competition between twinning and slip in these submicron-sized ionic crystals, revealing power-law scaling of strength with size for both mechanisms. The significant twinning size-dependence was found to follow a superimposed power-law with exponent of -1, identical to that in metals. These findings unveil the universality of the superimposed power-law size-effect for twinning in single-crystals and provide new insights on deformability of ceramics and microstructure-driven nano-plasticity.

KW - Crystallography

KW - Deformation twinning

KW - In-situ nanomechanics

KW - Plasticity

KW - Shape memory ceramics

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Size-dependence of zirconia-based ceramics via deformation twinning

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