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Published January 2021 | Supplemental Material
Journal Article Open

Size-dependence of zirconia-based ceramics via deformation twinning

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.

Additional Information

© 2020 Published by Elsevier. Received 17 September 2020, Revised 10 November 2020, Accepted 19 November 2020, Available online 3 December 2020. 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). The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Data and materials availability: All data is available in the main text or the supplementary materials.

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Created:
August 22, 2023
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October 23, 2023