Dislocation Structures in Low-Angle Grain Boundaries of α-Al2O3
Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
Department of Materials Physics, Nagoya University, Furo-chou, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya, Aichi 456-8587, Japan
Center for Elements Strategy Initiative for Structure Materials, Kyoto University, Yoshidahonmachi, Sakyo-ku, Kyoto 606-8501, Japan
Author to whom correspondence should be addressed.
Received: 14 February 2018 / Revised: 6 March 2018 / Accepted: 7 March 2018 / Published: 12 March 2018
) is one of the representative high-temperature structural materials. Dislocations in alumina play an important role in its plastic deformation, and they have attracted much attention for many years. However, little is known about their core atomic structures, with a few exceptions, because of lack of experimental observations at the atomic level. Low-angle grain boundaries are known to consist of an array of dislocations, and they are useful to compose dislocation structures. So far, we have systematically fabricated several types of alumina bicrystals with a low-angle grain boundary and characterized the dislocation structures by transmission electron microscopy (TEM). Here, we review the dislocation structures in
low-angle grain boundaries of alumina. Our observations revealed the core atomic structures of b
edge and screw dislocations,
edge dislocation, and
edge and mixed dislocations. Moreover, the stacking faults on
planes formed due to the dissociation reaction of the dislocations are discussed, focusing on their atomic structure and formation energy.
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MDPI and ACS Style
Tochigi, E.; Nakamura, A.; Shibata, N.; Ikuhara, Y. Dislocation Structures in Low-Angle Grain Boundaries of α-Al2O3. Crystals 2018, 8, 133.
Tochigi E, Nakamura A, Shibata N, Ikuhara Y. Dislocation Structures in Low-Angle Grain Boundaries of α-Al2O3. Crystals. 2018; 8(3):133.
Tochigi, Eita; Nakamura, Atsutomo; Shibata, Naoya; Ikuhara, Yuichi. 2018. "Dislocation Structures in Low-Angle Grain Boundaries of α-Al2O3." Crystals 8, no. 3: 133.
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