Journal of Materials Science

, Volume 46, Issue 12, pp 4428–4433 | Cite as

Dislocation structures in a {\( \bar{1} \)104}/〈11\( \bar{2} \)0〉 low-angle tilt grain boundary of alumina (α-Al2O3)

  • E. Tochigi
  • N. Shibata
  • A. Nakamura
  • T. Yamamoto
  • Y. Ikuhara
IIB 2010


An alumina (α-Al2O3) bicrystal with a (\( \bar{1} \)104)/[11\( \bar{2} \)0] 2o low-angle tilt grain boundary was fabricated by diffusion bonding at 1500 °C in air, and the grain boundary was observed by transmission electron microscopy (TEM). High-resolution TEM observations revealed that the grain boundary consists of at least two kinds of dislocations. One is a perfect dislocation which has a Burgers vector of 1/3[\( \bar{1} \)2\( \bar{1} \)0]. The other is dissociated into two partial dislocations with a stacking fault on the (0001) plane, and each partial dislocation has a 1/6[\( \bar{1} \)101] edge component. It is suggested from structural considerations that the dissociated-dislocation pair originates from a b = 1/3[02\( \bar{2} \)1] perfect dislocation (i.e., 1/3[02\( \bar{2} \)1] → 1/6[02\( \bar{2} \)1] + 1/6[02\( \bar{2} \)1]). This dissociation produces a stacking fault in the anion sublattice. The stacking fault energy is estimated to be roughly 1.3 Jm−2 based on the elastic theory. The authors discuss the dislocation structures and the stacking fault formed on the (0001) plane in detail.


Burger Vector Dislocation Structure Boundary Plane Partial Dislocation Translation Vector 



The authors would like to thank S.D. Findlay for critically reading the manuscript. This study was supported in part by the Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic-scale Modification” (no. 19053001) from the Ministry of Education, Culture, Sports and Technology (MEXT). E.T. was supported as a Japan Society for the Promotion of Science (JSPS) research fellow. N.S. acknowledges supports from PRESTO, Japan Science and Technology Agency, and the Grant-in-Aid for Young Scientists (A) (20686042) from MEXT.


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • E. Tochigi
    • 1
  • N. Shibata
    • 1
    • 2
  • A. Nakamura
    • 3
  • T. Yamamoto
    • 1
    • 4
  • Y. Ikuhara
    • 1
    • 4
    • 5
  1. 1.Institute of Engineering InnovationThe University of TokyoBunkyo-kuJapan
  2. 2.PRESTOSaitamaJapan
  3. 3.Department of Intelligent Materials EngineeringOsaka City UniversityOsakaJapan
  4. 4.Nanostructures Research LaboratoryJapan Fine Ceramics CenterAtsuta-ku NagoyaJapan
  5. 5.WPI-AIMR Research CenterTohoku UniversitySendaiJapan

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