High-Strain-Rate Superplastic Flow Mechanism in ZrO₂-30vol% Spinel Two-Phase Composite

Abstract:

High-strain-rate superplasticity (HSRS) can be attained in tetragonal ZrO2-30vol% MgAl2O4 spinel composite. In order to examine the flow behavior of the two-phase composite, the standard rule of the mixture model was employed. The strain rate of the composite can be explained by the isostrain model that is predicted from the data set of Al2O3 doped ZrO2 and spinel polycrystals. For the isostrain model, since the strain and strain rate are the same for ZrO2 and spinel phases, the harder ZrO2 phase carries more of the stress in the composite. In order to preserve homogeneous deformation and material continuity, a concomitant accommodation process within the harder ZrO2 grains is also necessary. For HSRS in the ZrO2-spinel composite, therefore, the rate of deformation may be controlled by the slower dislocation recovery process limited by the lattice diffusion within harder ZrO2 grains rather than within spinel grains.

• Periodical: Key Engineering Materials (Volume 433)
• Pages: 333-338
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.433.333
• Online since: March 2010
• Authors: Koji Morita, Keijiro Hiraga, Byung Nam Kim, Hidehiro Yoshida
• Keywords: Grain Boundary Sliding (GBS), High Strain Rate Superplasticity, Tetragonal ZrO₂

References

[1] T. G. Nieh, J. Wadswort and O. D. Sherby, in: Superplasticity in Metals and Ceramics. Cambridge University Press, United Kingdom (1997).

[2] A. H. Chokshi, T. G. Nieh and J. Wadswort: J. Am. Ceram. Soc., 74 (1991), p.869.

[3] K. Kajihara, Y. Yoshizawa and T. Sakuma: Acta Mater. 43 (1995), p.1235.

[4] K. Oka, N. Tabuchi, and T. Takashi: Mat. Sci. Forum, Vol. 304-306 (1999), p.451.

[5] T. S. Suzuki, Y. Sakka, K. Morita and K. Hiraga: Scripta Mater., 43 (2000), p.705.

[6] B. -N. Kim, K. Hiraga, K. Morita and Y. Sakka: Nature 413 (2001), p.288.

[7] B. -N. Kim, K. Hiraga, K. Morita, Y. Sakka, T. Yamada: Scripta Mater., 47 (2002), p.775.

[8] K. Morita, K. Hiraga and Y. Sakka: J. Am. Ceram. Soc., 85 (2002), p. (1900).

[9] K. Morita, K. Hiraga, B. -N. Kim, Y. Sakka: J. Mater. Res., 22 (2007), p.801.

[10] K. Morita, K. Hiraga and B. -N. Kim: Acta Mater., 55 (2007), p.4517.

[11] T. G. Nieh and J. Wadswort: Acta Mater., 38 (1990), p.1121.

[12] T. Kondo, Y. Takigawa, Y. Ikuhara and T. Sakuma: Mat. Trans. JIM, 39 (1998), p.1108.

[13] F. Wakai and H. Kato: Adv. Ceram. Mater., 3 (1988), p.71.

[14] T. G. Nieh and J. Wadsworth : Acta Mater., 39 (1991), p.3037.

[15] T. G. Langdon: Metall. Trans. A 13 (1982), p.689.

[16] M. Jiménez-Melendo et al.: J. Am. Ceram. Soc., 81 (1998), p.2761.

[17] K. Morita and K. Hiraga : Acta Mater., 50 (2002), p.1075.

[18] K. Morita, K. Hiraga and B. -N. Kim: Acta Mater., 52 (2004), p.3355.

[19] T. S. Suzuki, Y. Sakka and K. Hiraga: unpublished data.

[20] S. Swaroop et al.: Acta Mater., 53 (2005), p.4975.

[21] Duclos R, Doukhan N, Escaig B. Acta Mater 1982; 30: 1381.

[22] K. Morita et al.: J. Am. Ceram. Soc., 87 (2004), p.1102.

[23] J. D. French et al.: J. Am. Ceram. Soc., 77 (1994), p.2857.