Abstract
The role of MgAl2O4 spinel particle dispersion in high-strain-rate superplasticity (HSRS) of tetragonal ZrO2 was examined by characterizing microstructural changes during deformation. The dispersed spinel particles elongate with strain along tensile direction and the elongation tends to be pronounced with increasing strain rate. In the elongated spinel particles, intragranular dislocations lying along the elongated direction were observed, suggesting that the elongation relates to the dislocation motion. The flow behavior characterized by a stress exponent of ≈2.0 suggests that grain boundary sliding (GBS) is the predominant flow mechanism. The dislocation-induced plasticity in the spinel particles may assist the relaxation of stress concentrations exerted by GBS, leading to HSRS in tetragonal ZrO2.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
B.-N. Kim, K. Hiraga, K. Morita and Y. Sakka, Nature 413, 288 (2001)
B.-N. Kim, K. Hiraga, K. Morita, Y. Sakka and T. Yamada, Scripta Mater. 47, 775 (2002)
K. Morita, K. Hiraga and Y. Sakka, J. Am. Ceram. Soc. 85, 1900 (2002)
K. Morita, B. N. Kim, K. Hiraga and Y. Sakka, Mat. Sci. Forum 447-448, 329 (2004).
K. Morita, K. Hiraga, B. N. Kim and Y. Sakka, Mater. Trans., in press (2004).
T. G. Nieh, C. M. McNally and J. Wadsworth, Scripta Mater. 24, 763 (1989)
D. J. Schilller, A. H. Chokslu, T. G. Nieh and J. Wadswoit Acta Mater. 39, 3227 (1991).
T. Kondo, Y. Takigawa, Y. Ikuhara and T. Sakuina, Mat. Trans. JIM39, 1108 (1998).
J. C. Wurst and J. A. Nelson, J. Am. Ceram. Soc. 55, 109 (1972).
T. G. Nieli, J. Wadsworth and O. D. Sherby, “Superplasticity in Metals and Ceramics,” (Cambridge University Press, 1997) pp. 91–119.
K. Monta, K. Hnaga, B. N. Kim and Y. Sakka, J. Am. Ceram. Soc, to be submitted.
M. Jimenez-Melendo, A. Ebmmguez-Rochiguez and A. Bravo-Leon, J. Am. Ceram. Soc. 81, 2761 (1998).
TE. Mtchell J. Am. Ceram. Soc. 82, 3305 (1999).
Acknowledgments
The authors are grateful to the Mitsubishi Foundation for supporting the present work.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Morita, K., Hiraga, K., Kim, BN. et al. Role of Deformable Fine Spinel Particles in High-Strain-Rate Superplastic Flow of Tetragonal ZrO2. MRS Online Proceedings Library 821, 288–293 (2004). https://doi.org/10.1557/PROC-821-P8.28
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-821-P8.28