Strain Hardening in Superplastic Codoped Yttria-Stabilized Tetragonal-Zirconia Polycrystals

Kazutaka Sasaki, Manabu Nakano, Junpei Mimurada, Yiichi Ikuhara, Taketo Sakuma

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The superplastic characteristics of 3-mol%-yttria-stabilized tetragonal-zirconia polycrystals (3Y-TZP) were drastically improved by the combined addition of germanium oxide and other oxides (titanium, magnesium, and calcium), resulting in up to 1000% elongation under optimum conditions. Extensive work hardening of the codoped compositions for temperatures >1400°C was observed. Dynamic grain growth was not a sufficient mechanism to explain this anomalous high strain hardening. The appearance of a cubic phase that caused abnormal grain growth during testing may have resulted in increased flow stress, which resulted in exaggerated work hardening.

Original languageEnglish
Pages (from-to)2981-2986
Number of pages6
JournalJournal of the American Ceramic Society
Issue number3-12
Publication statusPublished - 2001 Dec


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