Room-temperature dislocation plasticity in ceramics: Methods, Materials, and Mechanisms

Abstract

Dislocation-mediated plastic deformation in ceramic materials has sparked renewed research interest due to the technological potential of dislocations. Despite the long research history of dislocations as one-dimensional lattice defects in crystalline solids, the understanding of plastically deformable ceramics at room temperature seems lacking. The conventional view holds that ceramics are brittle, difficult to deform at room temperature and exhibit no dislocation plasticity except in small-scale testing such as nanoindentation and nano-micropillar compression. In this review, we attempt to gather the evidence and reports of room-temperature dislocation plasticity in ceramics beyond the nano-/microscale, with a focus on meso-macroscale plasticity. First, we present a mechanical deformation toolbox covering various experimental approaches for assessing the dislocation plasticity, with a focus on bulk plasticity. Second, we provide a materials toolbox listing 44 ceramic compounds that have been reported to exhibit dislocation plasticity at meso-/macroscale under ambient conditions. Finally, we discuss the mechanics of dislocations in ceramics, aiming to establish a foundation for predicting and discovering additional ceramics capable of room-temperature plastic deformation, thereby advancing the development of prospective dislocation-based technologies.

References in corpus (7)

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Cited by in corpus (7)

• Scale-bridging dislocation plasticity in MgO at room temperature
• Stable crack propagation in dislocation-engineered oxide visualized by double cleavage drilled compression test
• Dislocation Engineering: A New Key to Enhancing Ceramic Performances
• A data-driven quest for room-temperature bulk plastically deformable ceramics
• Dislocation-enhanced piezoelectric catalysis of KNbO3 crystal for water splitting
• Oxygen Vacancies at Dislocation Core Modulate Plasticity in Strontium Titanate
• Hydrogen response to high-density dislocations in bulk perovskite oxide SrTiO3