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The isothermal compressive forming is carried out in the cylindrical nanocrystalline tetragonal (ZrO 2 ·3 mol% Y 2 O 3 ) 80 (Al 2 O 3 ) 20 sample, as prepared by consolidating the attrition milled amorphous powder in the absence of any additive, using the thermo-mechanical processing equipped with electric current heating, in order to provide a quantitative analysis for the superplastic flow inherent to the nanocrystalline ceramics. The nanocrystalline tetragonal (ZrO 2 ·3 mol% Y 2 O 3 ) 80 (Al 2 O 3 ) 20 sample shows a large decrease in true plastic strain rate.(e) up to a high compressibility of 0.75 with a decrease in true stress (a) without void formation and grain growth at the temperature from 1440 to 1590 K. The strain rate sensitivity exponent (m) as defined by the relationship of the form, m = ∂ In σ/∂ lne shows the constancy of 0.7 at a higher level of the strain rate compensated by temperature and reciprocal true stress, eσ -1 exp(Q/kT), following an increase from approximately 0.3 at a lower level of the parameter, for the superplastic flow in nanocrystalline (ZrO 2 ·3mol%Y 2 O 3 ) 80 (Al 2 O 3 ) 20 . The flexural strength of consolidated tetragonal (ZrO 2 ·3 molY 2 O 3 ) 80 (Al 2 O 3 ) 20 with the longitudinal crystallite size of approximately 40 nm is greatly enhanced by compressive forging relative to that of consolidated sample, and then characterized by the size effect with aspect ratio of sample width (W) to height (H) having nearly 2 GPa at the maximum in the case of W/H = 1.

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Mechanical Characteristics of Nanocrystalline (ZrO&lt;SUB&gt;2&lt;/SUB&gt;&amp;middot;20&amp;thinsp;mol%Y&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt;)&lt;SUB&gt;80&lt;/SUB&gt;(Al&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt;)&lt;SUB&gt;20&lt;/SUB&gt; Synthesized via Pulse Electric Current Consolidation of the Amorphous Powder