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Dense and translucent hydroxyapatite polycrystals (Calo-(P04)6(OH)2 with a grain size of 0.64 pm) were obtained by hot isostatic pressing at 203 MPa and 1000°C for 2 h in argon. The material exhibited superplastic elongation (>150%) in a tension test at temperatures from 1000" to 1100°C and at strain rates from 7.2 X lo-' to 3.6 X s-'. Extensive strain hardening was observed. The stress exponent of the yield stress was larger than 3. [

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