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Meeting MS&T22: Materials Science & Technology
Symposium Dislocations in Ceramics: Processing, Structure, Mechanics, and Functionality
Presentation Title Effects of Light Illumination on the Dislocation-mediated Plasticity in Single-crystalline ZnO
Author(s) Yan Li, Xufei Fang, Eita Tochigi, Yu Oshima, Katsuyuki Matsunaga, Atsutomo Nakamura
On-Site Speaker (Planned) Yan Li
Abstract Scope Dislocation-mediated plasticity in ceramics and oxides has attracted increasing research interest due to the promising mechanical and functional properties tuned by dislocations. In this work, we investigated the effects of light illumination on the dislocation-mediated plasticity in single-crystalline ZnO by using photoindentation technique. Nanoindentation tests were conducted both in darkness and in light. From the load-depth curves, evident pop-in events were observed. The maximum shear stresses at pop-in were found to be about the theoretical shear strength regardless of light conditions, indicating homogeneous dislocation nucleation without the assistance of pre-existing defect at pop-in. The average values of maximum shear stresses were slightly larger in light than in darkness, exhibiting a ‘photo-hardening’ effect in ZnO. Furthermore, the suppression of dislocation behavior by light was validated by combining with TEM observations.


Atomistic and Multiscale Computational Analysis of the Connection between Dislocation Slip and Ionic Transport in Plastically Deformed Oxides
Charged Dislocations in Ionic Ceramics: Equilibrium and Kinetics
Effects of Light Illumination on the Dislocation-mediated Plasticity in Single-crystalline ZnO
In Situ Observation of Fracture Dominated by a Single Dislocation and Its Governing Mechanics
Understanding and Engineering Dislocations in Oxides at Room Temperature

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