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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
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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.

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

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References

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