Formation of Regular Hexagonal Dislocation Network in Chemical-Furnace Sintered Alumina

Abstract:

Polycrystalline alumina was prepared at high temperature and high pressure from combustion reaction plus mechanical pressure. The defect structure in the sintered alumina was investigated by transmission electron microscopy and a regular hexagonal dislocation network was found. Diffraction contrast technique revealed that the regular hexagonal network on the (0001) plane was composed of three dislocations with Burgers vectors: 1/3[1210], 1/3[ 2110] and 1/3[1120]. The formation process of dislocation network was discussed.

• Periodical: Key Engineering Materials (Volumes 368-372)
• Pages: 672-674
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.368-372.672
• Online since: February 2008
• Authors: Fan Cheng Meng, Zheng Yi Fu, Wei Min Wang, Qing Jie Zhang
• Keywords: Al₂O₃, Dislocation Network, TEM

References

[1] M.L. Kronberg: Acta Metall. Vol. 5 (1957), p.507.

[2] J.D. Snow, A.H. Heuer: J. Am. Ceram. Soc. Vol. 56 (1973), p.53.

[3] K.P. D Lagerlof, A.H. Heuer, J. Castaing, et al.: J. Am. Ceram. Soc. Vol. 77 (1994), p.385.

[4] S.L. Korinek, J. Castaing: J. Am. Ceram. Soc. Vol. 86 (2003), p.566.

[5] T.E. Mitchell: J. Am. Ceram. Soc. Vol. 62 (1979), p.254.

[6] X.H. Tang, K.P.D. Lagerlof and H. Heuer: J. Am. Ceram. Soc. Vol. 86 (2003), p.560.

[7] Z.Y. Fu, H. Wang, W.M. Wang, et al.: J. Mater. Process. Tech Vol. 137 (2003), p.30.

[8] D. Hull, D.J. Bacon, in: Introduction to Dislocations, 3 nd Edition, Pergamon Press (1984).