Influence of a transition metal oxide (CuO) on the superplastic behaviour of 8 mol% yttria-stabilised cubic zirconia polycrystal (8Y-CSZ)

Tekeli S., Davies T.

JOURNAL OF MATERIALS SCIENCE, cilt.33, sa.13, ss.3267-3273, 1998 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 33 Sayı: 13
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1023/a:1013268810031
  • Dergi Adı: JOURNAL OF MATERIALS SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3267-3273
  • Gazi Üniversitesi Adresli: Evet

Özet

The microstructure and superplastic deformation of fine-grained undoped 8Y-CSZ and 1 wt% CuO doped 8Y-CSZ have been investigated in tension in the temperature range 1503 to 1623 K and strain rate range 5 x 10(-5) to 10(-3) s(-1). Deformation of the undoped 8Y-CSZ was characterized by large strain-hardening with limited tensile elongations of 20%; this was mainly due to severe grain growth during deformation. The addition of a small amount of a transition metal oxide (CuO) resulted in a decrease in strain-hardening and enhanced tensile elongations up to 78%. The ductility enhancement in the CuO doped 8Y-CSZ was due to copper segregation to grain boundaries, th us facilitating grain boundary sliding. In addition, the enhanced ductility in the doped material was related to a reduction in flow stress which, in turn, suppressed cavitation and delayed fracture. (C) 1998 Kluwer Academic Publishers.