Work

Dislocation Structures in {01-12}/〈2-1-10〉 Low Angle Grain Boundary and Dissociation Reaction of 1/3〈02-21〉 Dislocation in α-Al2O3

Year: 2026

Type: article

Abstract: Dislocation structures in the {0112}/⟨2110⟩ low-angle tilt grain boundary of α-Al2O3 were characterized by transmission electron microscopy. It was found that the grain boundary consists of dislocations with the Burgers vector of ⟨0110⟩, 1/3⟨1011⟩, and 1/3⟨0221⟩. These dislocations are dissociated into partial dislocations with stacking faults on the (0001) and/or {0110} planes. While the dissociation structures of the ⟨0110⟩ and 1/3⟨1011⟩ dislocations were consistent with previous reports, the 1/3⟨0221⟩ dislocation showed a characteristic V-shaped structure that had not been reported. This paper discusses the accommodation mechanism of the misorientation by the three types of dislocations and the dissociation structure of 1/3⟨0221⟩ in detail.

Source: MATERIALS TRANSACTIONS

DOI: 10.2320/matertrans.mt-mf2026008

Authors: Eita Tochigi, Atsutomo Nakamura, Naoya Shibata, Yuichi Ikuhara

Institutions: The University of Tokyo, The University of Osaka, Japan Fine Ceramics Center, Tohoku University, Institute for Materials Research, Tohoku University

Language: English

Topic: Microstructure and mechanical properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Funder: Japan Society for the Promotion of Science

Awards: Mechanical property evaluation of metal/ceramic interfaces by atomic-resolution insitu mechanical testing, G419000082, Establishment of fundamental theories on material strengthening mechanisms based on nano-dynamics observations