Hostname: page-component-5c6d5d7d68-pkt8n Total loading time: 0 Render date: 2024-08-20T15:00:43.105Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of grain size on superplastic behavior of Al2O3/YTZ

Published online by Cambridge University Press:  31 January 2011

T. G. Nieh  and
J. Wadsworth
T. G. Nieh
Affiliation:
Lockheed Missiles and Space Co., Inc., Research and Development Division, O/9310, B/204, 3257 Hanover Street, Palo Alto, California 94304-1191
J. Wadsworth
Affiliation:
Lockheed Missiles and Space Co., Inc., Research and Development Division, O/9310, B/204, 3257 Hanover Street, Palo Alto, California 94304-1191
Get access

Abstract

Grain size strongly influences the superplastic properties of a fine-grained, 20 wt.% Al2O3-reinforced, Y2O3-stabilized tetragonal ZrO2 (Al2O3/YTZ). The elongation to failure of the material decreases, and the flow strength increases, with increasing grain size. The flow stress at a constant true strain rate and at a given strain is proportional to the grain size raised to a 0.75 power. As a result, the superplastic deformation rate in Al2O3/YTZ is inversely proportional to the grain size raised to a 1.5 power.

Type
Materials Communications
Information
Journal of Materials Research , Volume 5 , Issue 11 , November 1990 , pp. 2613 - 2615
Copyright
Copyright © Materials Research Society 1990

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Sherby, D. and Wadsworth, J., in Deformation, Processing and Structure, edited by Krauss, G. (American Society for Metals, Metals Park, OH, 1984), p. 355.Google Scholar
2Wakai, F., Sakaguchi, S., and Matsuno, Y., Adv. Ceram. Mater. 1, 259 (1986).CrossRefGoogle Scholar
3Nieh, T. G., McNally, C. M., and Wadsworth, J., Scripta Metall. 22, 1297 (1988).CrossRefGoogle Scholar
4Wakai, F. and Kato, H., Adv. Ceram. Mater. 3, 71 (1988).CrossRefGoogle Scholar
5Nieh, T. G., McNally, C. M., and Wadsworth, J., Scripta Metall. 23, 457 (1989).CrossRefGoogle Scholar
6Wakai, F., Kodama, Y., Sakaguchi, S., and Nonami, T., J. Am. Ceram. Soc. 73 (2), 457 (1990).CrossRefGoogle Scholar
7Wakai, F., Kodama, Y., Sakaguchi, S., Murayama, N., Izaki, K., and Niihara, K., Nature 344, 421 (1990).CrossRefGoogle Scholar
8Wakai, F., Sakaguchi, S., and Kato, H., J. Ceram. Soc. Jpn. 94 (8), 721 (1986). (in Japanese)Google Scholar
9Carry, C.P., “High Ductilities, Superplastic Behaviors and Associated Mechanisms in Fine Grained Ceramics,” in MRS Inti. Meeting on Advanced Materials (IMAM-7, Superplasticity), edited by Kobayashi, M. and Wakai, F. (Materials Research Society, Pittsburgh, PA, 1989), Vol. 7, p. 199.Google Scholar
10Nieh, T. G. and Wadsworth, J., Scripta Metall. Mater. 24, 763 (1990).CrossRefGoogle Scholar
11Nieh, T. G. and Wadsworth, J., in Superplasticity in Metals, Ceramics, and Intermetallics, edited by Mayo, M. J., Wadsworth, J., Kobayashi, M., and Mukherjee, A. K. (Mater. Res. Soc. Symp. Proc. 196, Pittsburgh, PA, 1990).Google Scholar
12Nieh, T. G. and Wadsworth, J., Acta Metall. Mater. (1990), in press.Google Scholar
13Gruffel, P., Carry, C.P., and Mocellin, A., Science of Ceramics, edited by Taylor, D. (The Institute of Ceramics, U. K., 1988), Vol. 14, p. 587.Google Scholar